Strange hadron production in a quark combination model in Au+Au collisions at RHIC energies

Abstract

We apply a quark combination model to study yield densities and transverse momentum ($p_T$) spectra of strange (anti-)hadrons at mid-rapidity in central Au+Au collisions at $\sqrt{s_{NN}}=$ 7.7, 11.5, 19.6, 27, 39 and 200 GeV. We show that experimental data for $p_T$ spectra of (anti-)hadrons in these collisions can be systematically described by the equal velocity combination of constituent quarks and antiquarks at hadronization. We obtain $p_T$ spectra of quarks and antiquarks at hadronization and study their collision energy dependence. We also reproduce the yield densities of hadrons and anti-hadrons. In particular, we demonstrate that yield ratios of anti-hadrons to hadrons $K^{-}/K^{+}$, $\bar{p}/p$, $\bar{\Lambda }/\Lambda$, ${\bar{\Xi }}^{+}/{\Xi }^{-}$ and ${\bar{\Omega }}^{+}/{\Omega }^{-}$ simply correlate with each other and their experimental data except ${\bar{\Omega }}^{+}/{\Omega }^{-}$ at $\sqrt{s_{NN}}=$ 7.7 GeV are systematically described by the model. These results suggest that the equal velocity combination mechanism for quarks and antiquarks at hadronization plays an important role in Au+Au collisions at low RHIC energies ($\sqrt{s_{NN}}\ge$ 11.5 GeV).

arXiv comment14 pages, 13 figures

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Cited by in corpus (7)

• Production of light flavor and single-charmed hadrons in $pp$ collisions at $\sqrt{s}=5.02$ TeV in an equal-velocity quark combination model
• Production characteristics of light (anti-)nuclei from (anti-)nucleon coalescence in heavy ion collisions at energies employed at the RHIC beam energy scan
• Averaged transverse momentum correlations of hadrons in relativistic heavy-ion collisions
• Signals of quark combination at hadronization in $pp$ collisions at $\sqrt{s}=200$ GeV
• Transverse momentum and multiplicity dependence of ${\Lambda }_c^{+}/D^0$ ratio in $pp$ collisions at $\sqrt{s}=13$ TeV
• The domain of soft hadrons in transverse momentum space in high energy collisions
• Insight from the elliptic flow of identified hadrons measured in relativistic heavy-ion collisions