Showing 10 of 65 results
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.
Production of $d$, $t$, and $^3$He nuclei in central Pb+Pb interactions was studied at five collision energies ($\sqrt{s_{NN}}=$ 6.3, 7.6, 8.8, 12.3, and 17.3 GeV) with the NA49 detector at the CERN SPS. Transverse momentum spectra, rapidity distributions, and particle ratios were measured. Yields are compared to predictions of statistical models. Phase-space distributions of light nuclei are discussed and compared to those of protons in the context of a coalescence approach. The coalescence parameters $B_2$ and $B_3$, as well as coalescence radii for $d$ and $^3$He were determined as a function of transverse mass at all energies.
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of helium-3 in rapidity interval
Numerical data for the transverse momentum spectra of deuterons in rapidity interval
Numerical data for the transverse momentum spectra of deuterons in rapidity interval
Numerical data for the transverse momentum spectra of deuterons in rapidity interval
Numerical data for the transverse momentum spectra of deuterons in rapidity interval
Numerical data for the transverse momentum spectra of deuterons in rapidity interval
Numerical data for the transverse momentum spectra of deuterons in rapidity interval
Numerical data for the transverse momentum spectra of deuterons in rapidity interval
Numerical data for the transverse momentum spectra of deuterons in rapidity interval
Numerical data for the transverse momentum spectra of deuterons in rapidity interval
Numerical data for the transverse momentum spectra of deuterons in rapidity interval
Numerical data for the transverse momentum spectra of deuterons in rapidity interval
Numerical data for the transverse momentum spectra of deuterons in rapidity interval
Numerical data for the transverse momentum spectra of deuterons in rapidity interval
Numerical data for the transverse momentum spectra of deuterons in rapidity interval
Numerical data for the transverse momentum spectra of deuterons in rapidity interval
Numerical data for the transverse momentum spectra of tritons in rapidity interval
Numerical data for the transverse momentum spectra of tritons in rapidity interval
Numerical data for the transverse momentum spectra of tritons in rapidity interval
Numerical data for the transverse momentum spectra of tritons in rapidity interval
Numerical data for the transverse momentum spectra of tritons in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of Helium-3 in rapidity interval
Numerical data for the transverse mass spectra of tritium in rapidity interval
Numerical data for the transverse mass spectra of tritium in rapidity interval
Numerical data for the transverse mass spectra of tritium in rapidity interval
Numerical data for the transverse mass spectra of tritium in rapidity interval
Numerical data for the transverse mass spectra of tritium in rapidity interval
Numerical data for the transverse mass spectra of deuterim in rapidity interval
Numerical data for the transverse mass spectra of deuterim in rapidity interval
Numerical data for the transverse mass spectra of deuterim in rapidity interval
Numerical data for the transverse mass spectra of deuterim in rapidity interval
Numerical data for the transverse mass spectra of deuterim in rapidity interval
Numerical data for the coalescence parameter B2 of deuterons in rapidity interval
Numerical data for the coalescence parameter B2 of deuterons in rapidity interval
Numerical data for the coalescence parameter B2 of deuterons in rapidity interval
Numerical data for the coalescence parameter B2 of deuterons in rapidity interval
Numerical data for the coalescence parameter B2 of deuterons in rapidity interval
Numerical data for the coalescence parameter B3 of helium-3 in rapidity interval
Numerical data for the coalescence parameter B3 of helium-3 in rapidity interval
Numerical data for the coalescence parameter B3 of helium-3 in rapidity interval
Numerical data for the coalescence parameter B3 of helium-3 in rapidity interval
Numerical data for the coalescence parameter B3 of helium-3 in rapidity interval
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.
Measurements of multiplicity and transverse momentum fluctuations of charged particles were performed in inelastic p+p interactions at 20, 31, 40, 80 and 158 GeV/c beam momentum. Results for the scaled variance of the multiplicity distribution and for three strongly intensive measures of multiplicity and transverse momentum fluctuations \$\Delta[P_{T},N]\$, \$\Sigma[P_{T},N]\$ and \$\Phi_{p_T}\$ are presented. For the first time the results on fluctuations are fully corrected for experimental biases. The results on multiplicity and transverse momentum fluctuations significantly deviate from expectations for the independent particle production. They also depend on charges of selected hadrons. The string-resonance Monte Carlo models EPOS and UrQMD do not describe the data. The scaled variance of multiplicity fluctuations is significantly higher in inelastic p+p interactions than in central Pb+Pb collisions measured by NA49 at the same energy per nucleon. This is in qualitative disagreement with the predictions of the Wounded Nucleon Model. Within the statistical framework the enhanced multiplicity fluctuations in inelastic p+p interactions can be interpreted as due to event-by-event fluctuations of the fireball energy and/or volume.
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.
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.
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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
Balance functions have been measured in terms of relative pseudorapidity ($\Delta \eta$) for charged particle pairs at the Relativistic Heavy-Ion Collider (RHIC) from Au+Au collisions at $\sqrt{s_{\rm NN}}$ = 7.7 GeV to 200 GeV using the STAR detector. These results are compared with balance functions measured at the Large Hadron Collider (LHC) from Pb+Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV by the ALICE Collaboration. The width of the balance function decreases as the collisions become more central and as the beam energy is increased. In contrast, the widths of the balance functions calculated using shuffled events show little dependence on centrality or beam energy and are larger than the observed widths. Balance function widths calculated using events generated by UrQMD are wider than the measured widths in central collisions and show little centrality dependence. The measured widths of the balance functions in central collisions are consistent with the delayed hadronization of a deconfined quark gluon plasma (QGP). The narrowing of the balance function in central collisions at $\sqrt{s_{\rm NN}}$ = 7.7 GeV implies that a QGP is still being created at this relatively low energy.
We report the measurement of cumulants ($C_n, n=1\ldots4$) of the net-charge distributions measured within pseudorapidity ($|\eta|<0.35$) in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=7.7-200$ GeV with the PHENIX experiment at the Relativistic Heavy Ion Collider. The ratios of cumulants (e.g. $C_1/C_2$, $C_3/C_1$) of the net-charge distributions, which can be related to volume independent susceptibility ratios, are studied as a function of centrality and energy. These quantities are important to understand the quantum-chromodynamics phase diagram and possible existence of a critical end point. The measured values are very well described by expectation from negative binomial distributions. We do not observe any nonmonotonic behavior in the ratios of the cumulants as a function of collision energy. The measured values of $C_1/C_2 = \mu/\sigma^2$ and $C_3/C_1 = S\sigma^3/\mu$ can be directly compared to lattice quantum-chromodynamics calculations and thus allow extraction of both the chemical freeze-out temperature and the baryon chemical potential at each center-of-mass energy.
We present measurements of $\Omega$ and $\phi$ production at mid-rapidity from Au+Au collisions at nucleon-nucleon center-of-mass energies $\sqrt{s_{NN}}$ = 7.7, 11.5, 19.6, 27 and 39 GeV by the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). Motivated by the coalescence formation mechanism for these strange hadrons, we study the ratios of $N(\Omega^{-}+\Omega^{+})/(2N(\phi))$. These ratios as a function of transverse momentum ($p_T$) fall on a consistent trend at high collision energies, but start to show deviations in peripheral collisions at $\sqrt{s_{NN}}$ = 19.6, 27 and 39 GeV, and in central collisions at 11.5 GeV in the intermediate $p_T$ region of 2.4-3.6 GeV/c. We further evaluate empirically the strange quark $p_T$ distributions at hadronization by studying the $\Omega/\phi$ ratios scaled by the number of constituent quarks. The NCQ-scaled $\Omega/\phi$ ratios show a suppression of strange quark production in central collisions at 11.5 GeV compared to $\sqrt{s_{NN}} >= 19.6$ GeV. The shapes of the presumably thermal strange quark distributions in 0-60% most central collisions at 7.7 GeV show significant deviations from those in 0-10% most central collisions at higher energies. These features suggest that there is likely a change of the underlying strange quark dynamics in the transition from quark-matter to hadronic matter at collision energies below 19.6 GeV.
Phi Meson Spectra.
Phi Meson Spectra.
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ks(pTs) = N(Omega+Anti-Omega)_(pT=3pTs)/2N(phi)_(pT=2pTs) N is the invariant yield.
ks(pTs) = N(Omega+Anti-Omega)_(pT=3pTs)/2N(phi)_(pT=2pTs) N is the invariant yield.
ks(pTs) = N(Omega+Anti-Omega)_(pT=3pTs)/2N(phi)_(pT=2pTs) N is the invariant yield.
ks(pTs) = N(Omega+Anti-Omega)_(pT=3pTs)/2N(phi)_(pT=2pTs) N is the invariant yield.
ks(pTs) = N(Omega+Anti-Omega)_(pT=3pTs)/2N(phi)_(pT=2pTs) N is the invariant yield.
ks(pTs) = N(Omega+Anti-Omega)_(pT=3pTs)/2N(phi)_(pT=2pTs) N is the invariant yield.
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