Showing 7 of 7 results
Flow coefficients $v_{n}$ of the orders $n = 1 - 6$ are measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI for protons, deuterons and tritons as a function of centrality, transverse momentum and rapidity in Au+Au collisions at $\sqrt{s_{NN}} = 2.4$ GeV. Combining the information from the flow coefficients of all orders allows to construct for the first time, at collision energies of a few GeV, a multi-differential picture of the angular emission pattern of these particles. It reflects the complicated interplay between the effect of the central fireball pressure on the emission of particles and their subsequent interaction with spectator matter. The high precision information on higher order flow coefficients is a major step forward in constraining the equation-of-state of dense baryonic matter.
The $p_{t}$ dependence of $v_{1}$ for protons, deuterons and tritons in the rapidity interval $-0.25 < y_{cm} < -0.15$ in semi-central ($20 - 30$ %) $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=2.4$ GeV.
The $p_{t}$ dependence of $v_{3}$ for protons, deuterons and tritons in the rapidity interval $-0.25 < y_{cm} < -0.15$ in semi-central ($20 - 30$ %) $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=2.4$ GeV.
The $p_{t}$ dependence of $v_{5}$ for protons, deuterons and tritons in the rapidity interval $-0.25 < y_{cm} < -0.15$ in semi-central ($20 - 30$ %) $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=2.4$ GeV.
The $y_{cm}$ dependences of $v_{1}$ for protons, deuterons and tritons averaged over the $p_{t}$ interval $1.0 < p_{t} < 1.5$ GeV$/c$ in semi-central ($20 - 30$ %) Au+Au collisions at $\sqrt{{s}_{NN}}=2.4$ GeV.
The $y_{cm}$ dependences of $v_{3}$ for protons, deuterons and tritons averaged over the $p_{t}$ interval $1.0 < p_{t} < 1.5$ GeV$/c$ in semi-central ($20 - 30$ %) Au+Au collisions at $\sqrt{{s}_{NN}}=2.4$ GeV.
The $y_{cm}$ dependences of $v_{5}$ for protons, deuterons and tritons averaged over the $p_{t}$ interval $1.0 < p_{t} < 1.5$ GeV$/c$ in semi-central ($20 - 30$ %) Au+Au collisions at $\sqrt{{s}_{NN}}=2.4$ GeV.
The $p_{t}$ dependence of $v_{2}$ for protons, deuterons and tritons in the rapidity interval $|y_{cm}| < 0.05$ in semi-central ($20 - 30$ %) $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=2.4$ GeV.
The $p_{t}$ dependence of $v_{4}$ for protons, deuterons and tritons in the rapidity interval $|y_{cm}| < 0.05$ in semi-central ($20 - 30$ %) $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=2.4$ GeV.
The $p_{t}$ dependence of $v_{6}$ for protons, deuterons and tritons in the rapidity interval $|y_{cm}| < 0.05$ in semi-central ($20 - 30$ %) $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=2.4$ GeV.
The $y_{cm}$ dependences of $v_{2}$ for protons, deuterons and tritons averaged over the $p_{t}$ interval $1.0 < p_{t} < 1.5$ GeV$/c$ in semi-central ($20 - 30$ %) Au+Au collisions at $\sqrt{{s}_{NN}}=2.4$ GeV.
The $y_{cm}$ dependences of $v_{4}$ for protons, deuterons and tritons averaged over the $p_{t}$ interval $1.0 < p_{t} < 1.5$ GeV$/c$ in semi-central ($20 - 30$ %) Au+Au collisions at $\sqrt{{s}_{NN}}=2.4$ GeV.
The $y_{cm}$ dependences of $v_{6}$ for protons, deuterons and tritons averaged over the $p_{t}$ interval $1.0 < p_{t} < 1.5$ GeV$/c$ in semi-central ($20 - 30$ %) Au+Au collisions at $\sqrt{{s}_{NN}}=2.4$ GeV.
The ratio $v_{4}/v_{2}^{2}$ for protons in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=2.4$ GeV as a function of $p_{t}$ at mid-rapidity ($|y_{cm}| < 0.05$) for three different centralities.
The ratio $v_{4}/v_{2}^{2}$ for deuterons in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=2.4$ GeV as a function of $p_{t}$ at mid-rapidity ($|y_{cm}| < 0.05$) for three different centralities.
The ratio $v_{4}/v_{2}^{2}$ for tritons in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=2.4$ GeV as a function of $p_{t}$ at mid-rapidity ($|y_{cm}| < 0.05$) for three different centralities.
The ratio $v_{4}/v_{2}^{2}$ for tritons in Au+Au collisions $\sqrt{{s}_{NN}}=2.4$ GeV averaged over the $p_{t}$ interval $1.0 < p_{t} < 1.5$ GeV$/c$ for three different centralities.
The ratio $v_{4}/v_{2}^{2}$ for tritons in Au+Au collisions $\sqrt{{s}_{NN}}=2.4$ GeV averaged over the $p_{t}$ interval $1.0 < p_{t} < 1.5$ GeV$/c$ for three different centralities.
The ratio $v_{4}/v_{2}^{2}$ for tritons in Au+Au collisions $\sqrt{{s}_{NN}}=2.4$ GeV averaged over the $p_{t}$ interval $1.0 < p_{t} < 1.5$ GeV$/c$ for three different centralities.
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.
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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.
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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.
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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 $v_{2}{BBC} results were slightly shifted horizontally.
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We present high precision measurements of elliptic flow near midrapidity ($|y|<1.0$) for multi-strange hadrons and $\phi$ meson as a function of centrality and transverse momentum in Au+Au collisions at center of mass energy $\sqrt{s_{NN}}=$ 200 GeV. We observe that the transverse momentum dependence of $\phi$ and $\Omega$ $v_{2}$ is similar to that of $\pi$ and $p$, respectively, which may indicate that the heavier strange quark flows as strongly as the lighter up and down quarks. This observation constitutes a clear piece of evidence for the development of partonic collectivity in heavy-ion collisions at the top RHIC energy. Number of constituent quark scaling is found to hold within statistical uncertainty for both 0-30$\%$ and 30-80$\%$ collision centrality. There is an indication of the breakdown of previously observed mass ordering between $\phi$ and proton $v_{2}$ at low transverse momentum in the 0-30$\%$ centrality range, possibly indicating late hadronic interactions affecting the proton $v_{2}$.
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Light-particle emission from Au+Au collisions has been studied in the bombarding-energy range 100-250 A·MeV, using DeltaE- ER telescopes in coincidence with the FOPI detector in its phase I configuration. Center-of-mass energy spectra have been measured for Z = 1,2 isotopes emitted in central collisions at CM polar angles between 60° and 90°. Evidence for a collective expansion is reported, on the basis of the mean kinetic energies of hydrogen isotopes. Comparison is presented with statistical calculations (WIX code). For CM kinetic energy spectra, fair agreement is found between data and a recently developed transport model.
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Identified pi^[+/-] K^[+/-], p and p-bar transverse momentum spectra at mid-rapidity in sqrt(s_NN)=130 GeV Au-Au collisions were measured by the PHENIX experiment at RHIC as a function of collision centrality. Average transverse momenta increase with the number of participating nucleons in a similar way for all particle species. The multiplicity densities scale faster than the number of participating nucleons. Kaon and nucleon yields per participant increase faster than the pion yields. In central collisions at high transverse momenta (p_T greater than 2 GeV/c), anti-proton and proton yields are comparable to the pion yields.
Transverse momentum spectra for PI+ in the midrapidity range for the centrality region 0 to 5 PCT. Errors are combined statistical and systematics.
Transverse momentum spectra for PI- in the midrapidity range for the centrality region 0 to 5 PCT. Errors are combined statistical and systematics.
Transverse momentum spectra for K+ in the midrapidity range for the centrality region 0 to 5 PCT. Errors are combined statistical and systematics.
Transverse momentum spectra for K- in the midrapidity range for the centrality region 0 to 5 PCT. Errors are combined statistical and systematics.
Transverse momentum spectra for P in the midrapidity range for the centrality region 0 to 5 PCT. Errors are combined statistical and systematics.
Transverse momentum spectra for PBAR in the midrapidity range for the centrality region 0 to 5 PCT. Errors are combined statistical and systematics.
Transverse momentum spectra for PI+ in the midrapidity range for the centrality region 15 to 30 PCT. Errors are combined statistical and systematics.
Transverse momentum spectra for PI- in the midrapidity range for the centrality region 15 to 30 PCT. Errors are combined statistical and systematics.
Transverse momentum spectra for K+ in the midrapidity range for the centrality region 15 to 30 PCT. Errors are combined statistical and systematics.
Transverse momentum spectra for K- in the midrapidity range for the centrality region 15 to 30 PCT. Errors are combined statistical and systematics.
Transverse momentum spectra for P in the midrapidity range for the centrality region 15 to 30 PCT. Errors are combined statistical and systematics.
Transverse momentum spectra for PBAR in the midrapidity range for the centrality region 15 to 30 PCT. Errors are combined statistical and systematics.
Transverse momentum spectra for PI+ in the midrapidity range for the centrality region 60 to 92 PCT. Errors are combined statistical and systematics.
Transverse momentum spectra for PI- in the midrapidity range for the centrality region 60 to 92 PCT. Errors are combined statistical and systematics.
Transverse momentum spectra for K+ in the midrapidity range for the centrality region 60 to 92 PCT. Errors are combined statistical and systematics.
Transverse momentum spectra for K- in the midrapidity range for the centrality region 60 to 92 PCT. Errors are combined statistical and systematics.
Transverse momentum spectra for P in the midrapidity range for the centrality region 60 to 92 PCT. Errors are combined statistical and systematics.
Transverse momentum spectra for PBAR in the midrapidity range for the centrality region 60 to 92 PCT. Errors are combined statistical and systematics.
Average transverse momentum for PI+ and PI- as a function of the number of participation collisions (N(C=PART)).
Average transverse momentum for K+ and K- as a function of the number of participation collisions (N(C=PART)).
Average transverse momentum for P and PBAR as a function of the number of participation collisions (N(C=PART)).
Rapidity distributions of protons from central $^{197}$Au + $^{197}$Au collisions measured by the E895 Collaboration in the energy range from 2 to 8 AGeV at the Brookhaven AGS are presented. Longitudinal flow parameters derived using a thermal model including collective longitudinal expansion are extracted from these distributions. The results show an approximately linear increase in the longitudinal flow velocity, $<\beta\gamma>_{L}$, as a function of the logarithm of beam energy.
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Rapidity density for inclusive PROTON production.
We have measured the ratios of antiparticles to particles for charged pions, kaons and protons near mid-rapidity in central Au+Au collisions at sqrt(s_NN) = 130 GeV. For protons, we observe pbar/p = 0.60 +/- 0.04 (stat.) +/- 0.06 (syst.) in the transverse momentum range 0.15 < p_T < 1.0 GeV/c. This leads to an estimate of the baryo-chemical potential mu_B of 45 MeV, a factor of 5-6 smaller than in central Pb+Pb collisions at sqrt(s_NN) = 17.2 GeV.
130 GeV is sqrt(S) per nucleon-nucleon collision.
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