Showing 6 of 6 results
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 measurements of $\pi^-$ and $\pi^+$ elliptic flow, $v_2$, at midrapidity in Au+Au collisions at $\sqrt{s_{_{\rm NN}}} =$ 200, 62.4, 39, 27, 19.6, 11.5 and 7.7 GeV, as a function of event-by-event charge asymmetry, $A_{ch}$, based on data from the STAR experiment at RHIC. We find that $\pi^-$ ($\pi^+$) elliptic flow linearly increases (decreases) with charge asymmetry for most centrality bins at $\sqrt{s_{_{\rm NN}}} = \text{27 GeV}$ and higher. At $\sqrt{s_{_{\rm NN}}} = \text{200 GeV}$, the slope of the difference of $v_2$ between $\pi^-$ and $\pi^+$ as a function of $A_{ch}$ exhibits a centrality dependence, which is qualitatively similar to calculations that incorporate a chiral magnetic wave effect. Similar centrality dependence is also observed at lower energies.
The distribution of observed charge asymmetry from STAR data.
Pion $v_2${2} as a function of observed charge asymmetry.
$v_2$ difference between $\pi^-$ and $\pi^+$ as a function of charge asymmetry with the tracking efficiency correction, for 30-40% central Au+Au collisions at 200 GeV. The errors are statistical only.
The slope parameter r as a function of centrality for collision energy of 200 GeV.
The slope parameter r as a function of centrality for collision energy of 62.4 GeV.
The slope parameter r as a function of centrality for collision energy of 39 GeV.
The slope parameter r as a function of centrality for collision energy of 27 GeV.
The slope parameter r as a function of centrality for collision energy of 19.6 GeV.
The slope parameter r as a function of centrality for collision energy of 11.5 GeV.
The slope parameter r as a function of centrality for collision energy of 7.7 GeV.
The acceptance-corrected dielectron excess mass spectra, where the known hadronic sources have been subtracted from the inclusive dielectron mass spectra, are reported for the first time at mid-rapidity $|y_{ee}|<1$ in minimum-bias Au+Au collisions at $\sqrt{s_{NN}}$ = 19.6 and 200 GeV. The excess mass spectra are consistently described by a model calculation with a broadened $\rho$ spectral function for $M_{ee}<1.1$ GeV/$c^{2}$. The integrated dielectron excess yield at $\sqrt{s_{NN}}$ = 19.6 GeV for $0.4<M_{ee}<0.75$ GeV/$c^2$, normalized to the charged particle multiplicity at mid-rapidity, has a value similar to that in In+In collisions at $\sqrt{s_{NN}}$ = 17.3 GeV. For $\sqrt{s_{NN}}$ = 200 GeV, the normalized excess yield in central collisions is higher than that at $\sqrt{s_{NN}}$ = 17.3 GeV and increases from peripheral to central collisions. These measurements indicate that the lifetime of the hot, dense medium created in central Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV is longer than those in peripheral collisions and at lower energies.
Reconstructed dielectron unlike-sign pairs, like-sign pairs and signal distributions, together with the signal to background ratio (S/B). All columns are presented as a function of dielectron invariant mass in Au+Au collisions at $\sqrt{s_{NN}}$ = 19.6 GeV.
Dielectron invariant mass spectrum in the STAR acceptance (|$y_{ee}$| < 1, 0.2 < $p_T^e$ < 3 GeV/c, |$\eta^e$ | < 1) after efficiency correction in Au+Au collisions at $\sqrt{s_{NN}}$ = 19.6 GeV.
Hadronic cocktail consisting of the decays of light hadrons and correlated decays of charm in Au+Au collisions at $\sqrt{s_{NN}}$ = 19.6 GeV.
The acceptance-corrected excess dielectron mass spectra, normalized to the charged particle multiplicity at mid-rapidity dNch/dy, in Au+Au collisions at $\sqrt{s_{NN}}$ = 19.6 GeV. The dNch/dy values in Au+Au collisions at $\sqrt{s_{NN}}$ = 19.6 GeV are from Ref. [38]. The normalization uncertainty from the STAR measured dN/dy is about 10%, which is not shown in the table.
The acceptance-corrected excess dielectron mass spectra, normalized to the charged particle multiplicity at mid-rapidity dNch/dy, in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. The dNch/dy values in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV are from Ref. [39]. The normalization uncertainty from the STAR measured dN/dy is about 10%, which is not shown in the table.
Integrated yields of the normalized dilepton excesses for 0.4 < $M^{ll}$ < 0.75 GeV/c$^2$ as a function of dNch/dy. From top to bottom: 0-80% Au+Au collisions at $\sqrt{s_{NN}}$ = 19.6 GeV, then 0-10%, 10-40%, 40-80% and 0-80% Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV.
We report the beam energy (\sqrt s_{NN} = 7.7 - 200 GeV) and collision centrality dependence of the mean (M), standard deviation (\sigma), skewness (S), and kurtosis (\kappa) of the net-proton multiplicity distributions in Au+Au collisions. The measurements are carried out by the STAR experiment at midrapidity (|y| < 0.5) and within the transverse momentum range 0.4 < pT < 0.8 GeV/c in the first phase of the Beam Energy Scan program at the Relativistic Heavy Ion Collider. These measurements are important for understanding the Quantum Chromodynamic (QCD) phase diagram. The products of the moments, S\sigma and \kappa\sigma^{2}, are sensitive to the correlation length of the hot and dense medium created in the collisions and are related to the ratios of baryon number susceptibilities of corresponding orders. The products of moments are found to have values significantly below the Skellam expectation and close to expectations based on independent proton and anti-proton production. The measurements are compared to a transport model calculation to understand the effect of acceptance and baryon number conservation, and also to a hadron resonance gas model.
$\Delta N_p$ multiplicity distributions in Au+Au collisions at $\sqrt{S_{NN}}=7.7$ GeV for 0-5 percent, 30-40 percent and 70-80 percent collision centralities at midrapidity.
$\Delta N_p$ multiplicity distributions in Au+Au collisions at $\sqrt{S_{NN}}=11.5$ GeV for 0-5 percent, 30-40 percent and 70-80 percent collision centralities at midrapidity.
$\Delta N_p$ multiplicity distributions in Au+Au collisions at $\sqrt{S_{NN}}=19.6$ GeV for 0-5 percent, 30-40 percent and 70-80 percent collision centralities at midrapidity.
$\Delta N_p$ multiplicity distributions in Au+Au collisions at $\sqrt{S_{NN}}=27$ GeV for 0-5 percent, 30-40 percent and 70-80 percent collision centralities at midrapidity.
$\Delta N_p$ multiplicity distributions in Au+Au collisions at $\sqrt{S_{NN}}=39$ GeV for 0-5 percent, 30-40 percent and 70-80 percent collision centralities at midrapidity.
$\Delta N_p$ multiplicity distributions in Au+Au collisions at $\sqrt{S_{NN}}=62.4$ GeV for 0-5 percent, 30-40 percent and 70-80 percent collision centralities at midrapidity.
$\Delta N_p$ multiplicity distributions in Au+Au collisions at $\sqrt{S_{NN}}=200$ GeV for 0-5 percent, 30-40 percent and 70-80 percent collision centralities at midrapidity.
Centrality dependence of the cumulants of $\Delta N_p$ distributions for Au+Au collisions at $\sqrt{S_{NN}}=7.7$ GeV.
Centrality dependence of the cumulants of $\Delta N_p$ distributions for Au+Au collisions at $\sqrt{S_{NN}}=11.5$ GeV.
Centrality dependence of the cumulants of $\Delta N_p$ distributions for Au+Au collisions at $\sqrt{S_{NN}}=19.6$ GeV.
Centrality dependence of the cumulants of $\Delta N_p$ distributions for Au+Au collisions at $\sqrt{S_{NN}}=27$ GeV.
Centrality dependence of the cumulants of $\Delta N_p$ distributions for Au+Au collisions at $\sqrt{S_{NN}}=39$ GeV.
Centrality dependence of the cumulants of $\Delta N_p$ distributions for Au+Au collisions at $\sqrt{S_{NN}}=62.4$ GeV.
Centrality dependence of the cumulants of $\Delta N_p$ distributions for Au+Au collisions at $\sqrt{S_{NN}}=200$ GeV.
Centrality dependence of $S\sigma$/Skellam and $\kappa\sigma^2$ for $\Delta N_p$ in Au+Au collisions at $\sqrt{S_{NN}}=7.7$ GeV.
Centrality dependence of $S\sigma$/Skellam and $\kappa\sigma^2$ for $\Delta N_p$ in Au+Au collisions at $\sqrt{S_{NN}}=11.5$ GeV.
Centrality dependence of $S\sigma$/Skellam and $\kappa\sigma^2$ for $\Delta N_p$ in Au+Au collisions at $\sqrt{S_{NN}}=19.6$ GeV.
Centrality dependence of $S\sigma$/Skellam and $\kappa\sigma^2$ for $\Delta N_p$ in Au+Au collisions at $\sqrt{S_{NN}}=27$ GeV.
Centrality dependence of $S\sigma$/Skellam and $\kappa\sigma^2$ for $\Delta N_p$ in Au+Au collisions at $\sqrt{S_{NN}}=39$ GeV.
Centrality dependence of $S\sigma$/Skellam and $\kappa\sigma^2$ for $\Delta N_p$ in Au+Au collisions at $\sqrt{S_{NN}}=62.4$ GeV.
Centrality dependence of $S\sigma$/Skellam and $\kappa\sigma^2$ for $\Delta N_p$ in Au+Au collisions at $\sqrt{S_{NN}}=200$ GeV.
Collision energy and centrality dependence of the net-proton $S\sigma$ and $\kappa\sigma^2$ from Au+Au and p+p collisions at RHIC.
Collision energy and centrality dependence of the net-proton $S\sigma$ and $\kappa\sigma^2$ from Au+Au and p+p collisions at RHIC.
Collision energy and centrality dependence of the net-proton $S\sigma$ and $\kappa\sigma^2$ from Au+Au and p+p collisions at RHIC.
Collision energy and centrality dependence of the net-proton $S\sigma$ and $\kappa\sigma^2$ from Au+Au and p+p collisions at RHIC.
Cumulants of net-proton distribution at $\sqrt{S_{NN}}=7.7$ GeV. (efficiency corrected).
Cumulants of net-proton distribution at $\sqrt{S_{NN}}=11.5$ GeV. (efficiency corrected).
Cumulants of net-proton distribution at $\sqrt{S_{NN}}=19.6$ GeV. (efficiency corrected).
Cumulants of net-proton distribution at $\sqrt{S_{NN}}=27$ GeV. (efficiency corrected).
Cumulants of net-proton distribution at $\sqrt{S_{NN}}=39$ GeV. (efficiency corrected).
Cumulants of net-proton distribution at $\sqrt{S_{NN}}=62.4$ GeV. (efficiency corrected).
Cumulants of net-proton distribution at $\sqrt{S_{NN}}=200$ GeV. (efficiency corrected).
Cumulants of proton distribution at $\sqrt{S_{NN}}=7.7$ GeV. (efficiency corrected).
Cumulants of proton distribution at $\sqrt{S_{NN}}=11.5$ GeV. (efficiency corrected).
Cumulants of proton distribution at $\sqrt{S_{NN}}=19.6$ GeV. (efficiency corrected).
Cumulants of proton distribution at $\sqrt{S_{NN}}=27$ GeV. (efficiency corrected).
Cumulants of proton distribution at $\sqrt{S_{NN}}=39$ GeV. (efficiency corrected).
Cumulants of proton distribution at $\sqrt{S_{NN}}=62.4$ GeV. (efficiency corrected).
Cumulants of proton distribution at $\sqrt{S_{NN}}=200$ GeV. (efficiency corrected).
Cumulants of anti-proton distribution at $\sqrt{S_{NN}}=7.7$ GeV. (efficiency corrected).
Cumulants of anti-proton distribution at $\sqrt{S_{NN}}=11.5$ GeV. (efficiency corrected).
Cumulants of anti-proton distribution at $\sqrt{S_{NN}}=19.6$ GeV. (efficiency corrected).
Cumulants of anti-proton distribution at $\sqrt{S_{NN}}=27$ GeV. (efficiency corrected).
Cumulants of anti-proton distribution at $\sqrt{S_{NN}}=39$ GeV. (efficiency corrected).
Cumulants of anti-proton distribution at $\sqrt{S_{NN}}=62.4$ GeV. (efficiency corrected).
Cumulants of anti-proton distribution at $\sqrt{S_{NN}}=200$ GeV. (efficiency corrected).
Using the CLEO detector at the Cornell Electron Storage Ring, we have made a measurement of R=sigma(e+e- ->hadrons)/sigma(e+e- ->mu+mu-) =3.56+/-0.01+/-0.07 at ECM=10.52 GeV. This implies a value for the strong coupling constant of alpha_s(10.52 GeV)=0.20+/-0.01+/-0.06, or alpha_s(M_Z)=0.13+/-0.005+/-0.03.
Corrected for background and radiactive effects.
Value of ALPHAS, the strong coupling constant, from the measurement of R. CT,= ALPHAS also given evolved to the Z0 mass.
The inclusive production of ϱ 0 mesons in pp collisions has been measured at five c.m. energies from √ s = 23.6 to 63.0 GeV. The cross sections and the production spectra as a function of transverse momentum and rapidity are discussed.
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