Showing 10 of 31 results
The azimuthal anisotropy of $\Upsilon$(1S) mesons in high-multiplicity proton-lead collisions is studied using data collected by the CMS experiment at a nucleon-nucleon center-of-mass energy of 8.16 TeV. The $\Upsilon$(1S) mesons are reconstructed using their dimuon decay channel. The anisotropy is characterized by the second Fourier harmonic coefficients, found using a two-particle correlation technique, in which the $\Upsilon$(1S) mesons are correlated with charged hadrons. A large pseudorapidity gap is used to suppress short-range correlations. Nonflow contamination from the dijet background is removed using a low-multiplicity subtraction method, and the results are presented as a function of $\Upsilon$(1S) transverse momentum. The azimuthal anisotropies are smaller than those found for charmonia in proton-lead collisions at the same collision energy, but are consistent with values found for $\Upsilon$(1S) mesons in lead-lead interactions at a nucleon-nucleon center-of-mass energy of 5.02 TeV.
Anisotropies in the initial energy density distribution of the quark-gluon plasma created in high energy heavy ion collisions lead to anisotropies in the azimuthal distributions of the final-state particles known as collective flow. Fourier harmonic decomposition is used to quantify these anisotropies. The higher-order harmonics can be induced by the same order anisotropies (linear response) or by the combined influence of several lower order anisotropies (nonlinear response) in the initial state. The mixed higher-order anisotropic flow and nonlinear response coefficients of charged particles are measured as functions of transverse momentum and centrality in PbPb collisions at nucleon-nucleon center-of-mass energies $\sqrt{s_\mathrm{NN}} =$ 2.76 and 5.02 TeV with the CMS detector. The results are compared with viscous hydrodynamic calculations using several different initial conditions, as well as microscopic transport model calculations. None of the models provides a simultaneous description of the mixed higher-order flow harmonics and nonlinear response coefficients.
Results on $\phi$ meson production in inelastic p+p collisions at CERN SPS energies are presented. They are derived from data collected by the NA61/SHINE fixed target experiment, by means of invariant mass spectra fits in the $\phi \to K^+K^-$ decay channel. They include the first ever measured double differential spectra of $\phi$ mesons as a function of rapidity $y$ and transverse momentum $p_T$ for proton beam momenta of 80 GeV/c and 158 GeV/c, as well as single differential spectra of $y$ or $p_T$ for beam momentum of 40 GeV/c. The corresponding total $\phi$ yields per inelastic p+p event are obtained. These results are compared with existing data on $\phi$ meson production in p+p collisions. The comparison shows consistency but superior accuracy of the present measurements. The emission of $\phi$ mesons in p+p reactions is confronted with that occurring in Pb+Pb collisions, and the experimental results are compared with model predictions. It appears that none of the considered models can properly describe all the experimental observables.
Azimuthal correlations of charged particles in xenon-xenon collisions at a center-of-mass energy per nucleon pair of $ \sqrt{s_{_\mathrm{NN}}} =$ 5.44 TeV are studied. The data were collected by the CMS experiment at the LHC with a total integrated luminosity of 3.42 $\mu$b$^{-1}$. The collective motion of the system formed in the collision is parameterized by a Fourier expansion of the azimuthal particle density distribution. The azimuthal anisotropy coefficients $v_{2}$, $v_{3}$, and $v_{4}$ are obtained by the scalar-product, two-particle correlation, and multiparticle correlation methods. Within a hydrodynamic picture, these methods have different sensitivities to non-collective and fluctuation effects. The dependence of the Fourier coefficients on the size of the colliding system is explored by comparing the xenon-xenon results with equivalent lead-lead data. Model calculations that include initial-state fluctuation effects are also compared to the experimental results. The observed angular correlations provide new constraints on the hydrodynamic description of heavy ion collisions.
Elliptic-flow coefficients $v_2$ based on the two-particle correlations technique, as functions of transverse momentum and in bins of centrality. The results correspond to the range $|\eta| < 2.4$.
Elliptic-flow coefficients $v_2$ based on the scalar-product technique, as functions of transverse momentum and in bins of centrality. The results correspond to the range $|\eta| < 0.8$.
Elliptic-flow coefficients $v_2$ based on the four-particle correlations technique, as functions of transverse momentum and in bins of centrality. The results correspond to the range $|\eta| < 2.4$.
Elliptic-flow coefficients $v_2$ based on the six-particle correlations technique, as functions of transverse momentum and in bins of centrality. The results correspond to the range $|\eta| < 2.4$.
Elliptic-flow coefficients $v_2$ based on the eight-particle correlations technique, as functions of transverse momentum and in bins of centrality. The results correspond to the range $|\eta| < 2.4$.
Triangular-flow coefficients $v_3$ based on the two-particle correlations technique, as functions of transverse momentum and in bins of centrality. The results correspond to the range $|\eta| < 2.4$.
Triangular-flow coefficients $v_3$ based on the scalar-product technique, as functions of transverse momentum and in bins of centrality. The results correspond to the range $|\eta| < 0.8$.
Triangular-flow coefficients $v_3$ based on the four-particle correlations technique, as functions of transverse momentum and in bins of centrality. The results correspond to the range $|\eta| < 2.4$.
The $v_4$ coefficients based on the two-particle correlations technique, as functions of transverse momentum and in bins of centrality. The results correspond to the range $|\eta| < 2.4$.
The $v_4$ coefficients based on the scalar-product technique, as functions of transverse momentum and in bins of centrality. The results correspond to the range $|\eta| < 0.8$.
Centrality dependence of the spectrum-weighted $v_2$ flow harmonics with $0.3 < p_{\mathrm{T}} < 3.0~\mathrm{GeV}/c$. The $v_2$ results are shown for two-, four-, six-, and eight-particle correlations.
Centrality dependence of the spectrum-weighted $v_3$ flow harmonics with $0.3 < p_{\mathrm{T}} < 3.0~\mathrm{GeV}/c$. The results are shown for two- and four-particle correlations.
Centrality dependence of the spectrum-weighted $v_4$ flow harmonics with $0.3 < p_{\mathrm{T}} < 3.0~\mathrm{GeV}/c$. The results are shown for two-particle correlations.
Centrality dependence of $v_2\{4\}/v_2\{2\}$ ratios.
Centrality dependence of $v_2\{6\}/v_2\{4\}$ ratios.
Centrality dependence of $v_3\{4\}/v_3\{2\}$ ratios.
The $v_2$ results measured with two-particle correlations from PbPb collisions at $5.02~$TeV, shown as a function of $p_{\mathrm{T}}$ in eleven centrality bins.
The $v_3$ results measured with two-particle correlations from PbPb collisions at $5.02~$TeV, shown as a function of $p_{\mathrm{T}}$ in eleven centrality bins.
The $v_4$ results measured with two-particle correlations from PbPb collisions at $5.02~$TeV, shown as a function of $p_{\mathrm{T}}$ in eleven centrality bins.
Ratios of the $v_2$ harmonic coefficients from two-particle correlations in XeXe and PbPb collisions as functions of $p_{\mathrm{T}}$ in 11 centrality bins.
Ratios of the $v_3$ harmonic coefficients from two-particle correlations in XeXe and PbPb collisions as functions of $p_{\mathrm{T}}$ in 11 centrality bins.
Ratios of the $v_4$ harmonic coefficients from two-particle correlations in XeXe and PbPb collisions as functions of $p_{\mathrm{T}}$ in 11 centrality bins.
Centrality dependence of the spectrum-weighted $v_2$, $v_3$, and $v_4$ harmonic coefficients from two-particle correlations method for $0.3 < p_{\mathrm{T}} < 3.0 \mathrm{GeV}/c$ for PbPb collisions at $5.02$~TeV.
Ratios of the $v_2$, $v_3$, and $v_4$ harmonic coefficients from two-particle correlations in XeXe and PbPb collisions as functions or $0.3 < p_{\mathrm{T}} < 3.0~\mathrm{GeV}/c$ as a function of centrality.
Measurements of inclusive spectra and mean multiplicities of $\pi^\pm$, K$^\pm$, p and $\bar{\textrm{p}}$ produced in inelastic p+p interactions at incident projectile momenta of 20, 31, 40, 80 and 158 GeV/c ($\sqrt{s} = $ 6.3, 7.7, 8.8, 12.3 and 17.3 GeV, respectively) were performed at the CERN Super Proton Synchrotron using the large acceptance NA61/SHINE hadron spectrometer. Spectra are presented as function of rapidity and transverse momentum and are compared to predictions of current models. The measurements serve as the baseline in the NA61/SHINE study of the properties of the onset of deconfinement and search for the critical point of strongly interacting matter.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 31 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 20 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of K+ produced in inelastic p+p interactions at 20 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of K+ produced in inelastic p+p interactions at 20 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of p produced in inelastic p+p interactions at 20 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of p produced in inelastic p+p interactions at 20 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of pi+ produced in inelastic p+p interactions at 20 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi+ produced in inelastic p+p interactions at 20 GeV/c with ssystematic uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 20 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 20 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 31 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 31 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 31 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 31 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 31 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 31 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 31 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 31 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 31 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 31 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 31 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 31 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 40 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 40 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 40 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 40 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 40 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 40 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 40 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 40 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 40 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 40 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 40 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 40 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 80 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 80 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 80 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 80 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 80 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 80 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 80 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 80 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 80 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 80 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 80 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 80 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 158 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 158 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 158 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of K− produced in inelastic p+p interactions at 158 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 158 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 158 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 158 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 158 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 158 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 158 GeV/c with systematic uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 158 GeV/c with statistical uncertainties.
Transverse momentum-rapidity spectrum of pi− produced in inelastic p+p interactions at 158 GeV/c with systematic uncertainties.
Rapidity spectrum of K- from p+p->K-+X at 158 GeV/c with statistical uncertainties.
Rapidity spectrum of K- from p+p->K-+X at 158 GeV/c with systematic uncertainties.
Rapidity spectrum of K+ from p+p->K++X at 158 GeV/c with statistical uncertainties.
Rapidity spectrum of K+ from p+p->K++X at 158 GeV/c with systematic uncertainties.
Rapidity spectrum of pi- from p+p->pi-+X at 158 GeV/c with statistical uncertainties.
Rapidity spectrum of pi- from p+p->pi-+X at 158 GeV/c with systematic uncertainties.
Rapidity spectrum of pi+ from p+p->pi++X at 158 GeV/c with statistical uncertainties.
Rapidity spectrum of pi+ from p+p->pi++X at 158 GeV/c with systematic uncertainties.
Rapidity spectrum of p from p+p->p+X at 158 GeV/c with statistical uncertainties.
Rapidity spectrum of p from p+p->p+X at 158 GeV/c with systematic uncertainties.
Rapidity spectrum of barp from p+p->barp+X at 158 GeV/c with statistical uncertainties.
Rapidity spectrum of barp from p+p->barp+X at 158 GeV/c with systematic uncertainties.
Rapidity spectrum of K- from p+p->K-+X at 80 GeV/c with statistical uncertainties.
Rapidity spectrum of K- from p+p->K-+X at 80 GeV/c with systematic uncertainties.
Rapidity spectrum of K+ from p+p->K++X at 80 GeV/c with statistical uncertainties.
Rapidity spectrum of K+ from p+p->K++X at 80 GeV/c with systematic uncertainties.
Rapidity spectrum of pi- from p+p->pi-+X at 80 GeV/c with statistical uncertainties.
Rapidity spectrum of pi- from p+p->pi-+X at 80 GeV/c with systematic uncertainties.
Rapidity spectrum of pi+ from p+p->pi++X at 80 GeV/c with statistical uncertainties.
Rapidity spectrum of pi+ from p+p->pi++X at 80 GeV/c with systematic uncertainties.
Rapidity spectrum of p from p+p->p+X at 80 GeV/c with statistical uncertainties.
Rapidity spectrum of p from p+p->p+X at 80 GeV/c with systematic uncertainties.
Rapidity spectrum of barp from p+p->barp+X at 80 GeV/c with statistical uncertainties.
Rapidity spectrum of barp from p+p->barp+X at 80 GeV/c with systematic uncertainties.
Rapidity spectrum of K- from p+p->K-+X at 40 GeV/c with statistical uncertainties.
Rapidity spectrum of K- from p+p->K-+X at 40 GeV/c with systematic uncertainties.
Rapidity spectrum of K+ from p+p->K++X at 40 GeV/c with statistical uncertainties.
Rapidity spectrum of K+ from p+p->K++X at 40 GeV/c with systematic uncertainties.
Rapidity spectrum of pi- from p+p->pi-+X at 40 GeV/c with statistical uncertainties.
Rapidity spectrum of pi- from p+p->pi-+X at 40 GeV/c with systematic uncertainties.
Rapidity spectrum of pi+ from p+p->pi++X at 40 GeV/c with statistical uncertainties.
Rapidity spectrum of pi+ from p+p->pi++X at 40 GeV/c with systematic uncertainties.
Rapidity spectrum of p from p+p->p+X at 40 GeV/c with statistical uncertainties.
Rapidity spectrum of p from p+p->p+X at 40 GeV/c with systematic uncertainties.
Rapidity spectrum of barp from p+p->barp+X at 40 GeV/c with statistical uncertainties.
Rapidity spectrum of barp from p+p->barp+X at 40 GeV/c with systematic uncertainties.
Rapidity spectrum of K- from p+p->K-+X at 31 GeV/c with statistical uncertainties.
Rapidity spectrum of K- from p+p->K-+X at 31 GeV/c with systematic uncertainties.
Rapidity spectrum of K+ from p+p->K++X at 31 GeV/c with statistical uncertainties.
Rapidity spectrum of K+ from p+p->K++X at 31 GeV/c with systematic uncertainties.
Rapidity spectrum of pi- from p+p->pi-+X at 31 GeV/c with statistical uncertainties.
Rapidity spectrum of pi- from p+p->pi-+X at 31 GeV/c with systematic uncertainties.
Rapidity spectrum of pi+ from p+p->pi++X at 31 GeV/c with statistical uncertainties.
Rapidity spectrum of pi+ from p+p->pi++X at 31 GeV/c with systematic uncertainties.
Rapidity spectrum of p from p+p->p+X at 31 GeV/c with statistical uncertainties.
Rapidity spectrum of p from p+p->p+X at 31 GeV/c with systematic uncertainties.
Rapidity spectrum of barp from p+p->barp+X at 31 GeV/c with statistical uncertainties.
Rapidity spectrum of barp from p+p->barp+X at 31 GeV/c with systematic uncertainties.
Rapidity spectrum of K- from p+p->K-+X at 20 GeV/c with statistical uncertainties.
Rapidity spectrum of K- from p+p->K-+X at 20 GeV/c with systematic uncertainties.
Rapidity spectrum of K+ from p+p->K++X at 20 GeV/c with statistical uncertainties.
Rapidity spectrum of K+ from p+p->K++X at 20 GeV/c with systematic uncertainties.
Rapidity spectrum of pi- from p+p->pi-+X at 20 GeV/c with statistical uncertainties.
Rapidity spectrum of pi- from p+p->pi-+X at 20 GeV/c with systematic uncertainties.
Rapidity spectrum of pi+ from p+p->pi++X at 20 GeV/c with statistical uncertainties.
Rapidity spectrum of pi+ from p+p->pi++X at 20 GeV/c with systematic uncertainties.
Rapidity spectrum of p from p+p->p+X at 20 GeV/c with statistical uncertainties.
Rapidity spectrum of p from p+p->p+X at 20 GeV/c with systematic uncertainties.
Results on two-particle $\Delta\eta\Delta\phi$ correlations in inelastic p+p interactions at 20, 31, 40, 80, and 158~GeV/c are presented. The measurements were performed using the large acceptance NA61/SHINE hadron spectrometer at the CERN Super Proton Synchrotron. The data show structures which can be attributed mainly to effects of resonance decays, momentum conservation, and quantum statistics. The results are compared with the EPOS and UrQMD models.
Two-particle correlation function C(Delta eta, Delta phi) for all charge pairs in inelastic p+p interactions at 20 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for all charge pairs in inelastic p+p interactions at 31 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for all charge pairs in inelastic p+p interactions at 40 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for all charge pairs in inelastic p+p interactions at 80 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for all charge pairs in inelastic p+p interactions at 158 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for unlike-signed pairs in inelastic p+p interactions at 20 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for unlike-signed pairs in inelastic p+p interactions at 31 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for unlike-signed pairs in inelastic p+p interactions at 40 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for unlike-signed pairs in inelastic p+p interactions at 80 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for unlike-signed pairs in inelastic p+p interactions at 158 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for positively charged pairs in inelastic p+p interactions at 20 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for positively charged pairs in inelastic p+p interactions at 31 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for positively charged pairs in inelastic p+p interactions at 40 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for positively charged pairs in inelastic p+p interactions at 80 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for positively charged pairs in inelastic p+p interactions at 158 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for positively charged pairs in inelastic p+p interactions at 20 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for positively charged pairs in inelastic p+p interactions at 31 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for positively charged pairs in inelastic p+p interactions at 40 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for positively charged pairs in inelastic p+p interactions at 80 GeV/c.
Two-particle correlation function C(Delta eta, Delta phi) for positively charged pairs in inelastic p+p interactions at 158 GeV/c.
We present measurements of 2$^{nd}$ order azimuthal anisotropy ($v_{2}$) at mid-rapidity $(|y|<1.0)$ for light nuclei d, t, $^{3}$He (for $\sqrt{s_{NN}}$ = 200, 62.4, 39, 27, 19.6, 11.5, and 7.7 GeV) and anti-nuclei $\bar{\rm d}$ ($\sqrt{s_{NN}}$ = 200, 62.4, 39, 27, and 19.6 GeV) and $^{3}\bar{\rm He}$ ($\sqrt{s_{NN}}$ = 200 GeV) in the STAR (Solenoidal Tracker at RHIC) experiment. The $v_{2}$ for these light nuclei produced in heavy-ion collisions is compared with those for p and $\bar{\rm p}$. We observe mass ordering in nuclei $v_{2}(p_{T})$ at low transverse momenta ($p_{T}<2.0$ GeV/$c$). We also find a centrality dependence of $v_{2}$ for d and $\bar{\rm d}$. The magnitude of $v_{2}$ for t and $^{3}$He agree within statistical errors. Light-nuclei $v_{2}$ are compared with predictions from a blast wave model. Atomic mass number ($A$) scaling of light-nuclei $v_{2}(p_{T})$ seems to hold for $p_{T}/A < 1.5$ GeV/$c$. Results on light-nuclei $v_{2}$ from a transport-plus-coalescence model are consistent with the experimental measurements.
We present results from a harmonic decomposition of two-particle azimuthal correlations measured with the STAR detector in Au+Au collisions for energies ranging from $\sqrt{s_{NN}}=7.7$ GeV to 200 GeV. The third harmonic $v_3^2\{2\}=\langle \cos3(\phi_1-\phi_2)\rangle$, where $\phi_1-\phi_2$ is the angular difference in azimuth, is studied as a function of the pseudorapidity difference between particle pairs $\Delta\eta = \eta_1-\eta_2$. Non-zero {\vthree} is directly related to the previously observed large-$\Delta\eta$ narrow-$\Delta\phi$ ridge correlations and has been shown in models to be sensitive to the existence of a low viscosity Quark Gluon Plasma (QGP) phase. For sufficiently central collisions, $v_3^2\{2\}$ persist down to an energy of 7.7 GeV suggesting that QGP may be created even in these low energy collisions. In peripheral collisions at these low energies however, $v_3^2\{2\}$ is consistent with zero. When scaled by pseudorapidity density of charged particle multiplicity per participating nucleon pair, $v_3^2\{2\}$ for central collisions shows a minimum near {\snn}$=20$ GeV.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Representative results on $v_3^2\{2\}$ from Au+Au collisions as a function of $\Delta\eta$ for charged hadrons with pT > 0.2 GeV/c and |$\eta$| < 1.
Npart values are for the corresponding centrality at 200 GeV.
Npart values are for the corresponding centrality at 200 GeV.
Npart values are for the corresponding centrality at 200 GeV.
Npart values are for the corresponding centrality at 200 GeV.
Npart values are for the corresponding centrality at 200 GeV.
Npart values are for the corresponding centrality at 200 GeV.
Npart values are for the corresponding centrality at 200 GeV.
Npart values are for the corresponding centrality at 200 GeV.
No description provided.
Elliptic flow (v_2) values for identified particles at midrapidity in Au + Au collisions measured by the STAR experiment in the Beam Energy Scan at the Relativistic Heavy Ion Collider at sqrt{s_{NN}}= 7.7--62.4 GeV are presented for three centrality classes. The centrality dependence and the data at sqrt{s_{NN}}= 14.5 GeV are new. Except at the lowest beam energies we observe a similar relative v_2 baryon-meson splitting for all centrality classes which is in agreement within 15% with the number-of-constituent quark scaling. The larger v_2 for most particles relative to antiparticles, already observed for minimum bias collisions, shows a clear centrality dependence, with the largest difference for the most central collisions. Also, the results are compared with A Multiphase Transport Model and fit with a Blast Wave model.
No description provided.
The difference in $v_{2}$ between particles (X) and their corresponding antiparticles $\bar{X}$ (see legend) as a function of $\sqrt{s_{NN}}$ for 10%-40% central Au + Au collisions. The systematic errors are shown by the hooked error bars. The dashed lines in the plot are fits with a power-law function.
No description provided.
The difference in $v_{2}$ between protons and antiprotons as a function of $\sqrt{s_{NN}}$ for 0%-10%, 10%-40% and 40%-80% central Au + Au collisions. The systematic errors are shown by the hooked error bars. The dashed lines in the plot are fits with a power-law function.
No description provided.
The relative difference. The systematic errors are shown by the hooked error bars. The dashed lines in the plot are fits with a power-law function.
No description provided.
The $v_{2}$ difference between protons and antiprotons (and between $\pi^{+}$ and $pi^{-}$) for 10%-40% centrality Au+Au collisions at 7.7, 11.5, 14.5, and 19.6 GeV. The $v_{2}{BBC} results were slightly shifted horizontally.
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Measurements of midrapidity charged particle multiplicity distributions, $dN_{\rm ch}/d\eta$, and midrapidity transverse-energy distributions, $dE_T/d\eta$, are presented for a variety of collision systems and energies. Included are distributions for Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$, 130, 62.4, 39, 27, 19.6, 14.5, and 7.7 GeV, Cu$+$Cu collisions at $\sqrt{s_{_{NN}}}=200$ and 62.4 GeV, Cu$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV, U$+$U collisions at $\sqrt{s_{_{NN}}}=193$ GeV, $d$$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV, $^{3}$He$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV, and $p$$+$$p$ collisions at $\sqrt{s_{_{NN}}}=200$ GeV. Centrality-dependent distributions at midrapidity are presented in terms of the number of nucleon participants, $N_{\rm part}$, and the number of constituent quark participants, $N_{q{\rm p}}$. For all $A$$+$$A$ collisions down to $\sqrt{s_{_{NN}}}=7.7$ GeV, it is observed that the midrapidity data are better described by scaling with $N_{q{\rm p}}$ than scaling with $N_{\rm part}$. Also presented are estimates of the Bjorken energy density, $\varepsilon_{\rm BJ}$, and the ratio of $dE_T/d\eta$ to $dN_{\rm ch}/d\eta$, the latter of which is seen to be constant as a function of centrality for all systems.
Transverse energy in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
Multiplicity in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
Transverse energy in Au+Au collisions at $\sqrt{s_{NN}}$ = 130 GeV
Multiplicity in Au+Au collisions at $\sqrt{s_{NN}}$ = 130 GeV
Transverse energy in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV
Multiplicity in Au+Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV
Transverse energy in Au+Au collisions at $\sqrt{s_{NN}}$ = 39 GeV
Multiplicity in Au+Au collisions at $\sqrt{s_{NN}}$ = 39 GeV
Transverse energy in Au+Au collisions at $\sqrt{s_{NN}}$ = 27 GeV
Multiplicity in Au+Au collisions at $\sqrt{s_{NN}}$ = 27 GeV
Transverse energy in Au+Au collisions at $\sqrt{s_{NN}}$ = 19.6 GeV
Multiplicity in Au+Au collisions at $\sqrt{s_{NN}}$ = 19.6 GeV
Transverse energy in Au+Au collisions at $\sqrt{s_{NN}}$ = 14.5 GeV
Multiplicity in Au+Au collisions at $\sqrt{s_{NN}}$ = 14.5 GeV
Transverse energy in Au+Au collisions at $\sqrt{s_{NN}}$ = 7.7 GeV
Multiplicity in Au+Au collisions at $\sqrt{s_{NN}}$ = 7.7 GeV
Transverse energy in Cu+Cu collisions at $\sqrt{s_{NN}}$ = 200 GeV
Multiplicity in Cu+Cu collisions at $\sqrt{s_{NN}}$ = 200 GeV
Transverse energy in Cu+Cu collisions at $\sqrt{s_{NN}}$ = 62.4 GeV
Multiplicity in Cu+Cu collisions at $\sqrt{s_{NN}}$ = 62.4 GeV
Transverse energy in Cu+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
Multiplicity in Cu+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
Transverse energy in U+U collisions at $\sqrt{s_{NN}}$ = 193 GeV
Multiplicity in U+U collisions at $\sqrt{s_{NN}}$ = 193 GeV
Transverse energy in d+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
Multiplicity in d+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
Transverse energy in He+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
Multiplicity in He+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
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