Chemical potentials of light flavor quarks from yield ratios of negative to positive particles in Au+Au collisions at RHIC

Abstract

The transverse momentum spectra of ${\pi }^{-}$, ${\pi }^{+}$, $K^{-}$, $K^{+}$, $\bar{p}$, and $p$ produced in Au+Au collisions at center-of-mass energy $\sqrt{s_{NN}}=7.7$, 11.5, 19.6, 27, 39, 62.4, 130, and $200$ GeV are analyzed in the framework of a multisource thermal model. The experimental data measured at midrapidity by the STAR Collaboration are fitted by the (two-component) standard distribution. The effective temperature of emission source increases obviously with the increase of the particle mass and the collision energy. At different collision energies, the chemical potentials of up, down, and strange quarks are obtained from the antiparticle to particle yield ratios in given transverse momentum ranges available in experiments. With the increase of logarithmic collision energy, the chemical potentials of light flavor quarks decrease exponentially.

arXiv comment9 pages, 2 figures. Advances in High Energy Physics, accepted

References in corpus (17)

• Quark Gluon Plasma an Color Glass Condensate at RHIC? The perspective from the BRAHMS experiment
• The order of the quantum chromodynamics transition predicted by the standard model of particle physics
• Signatures of the Tricritical Point in QCD
• Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR
• Hadron production in central nucleus-nucleus collisions at chemical freeze-out
• Critical point of QCD at finite T and μ, lattice results for physical quark masses
• Identified Charged Particle Spectra and Yields in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Comparison of Chemical Freeze-Out Criteria in Heavy-Ion Collisions
• The QCD Equation of State with almost Physical Quark Masses
• Hadron production in Au-Au collisions at RHIC
• Chemical Equilibration in Pb+Pb Collisions at the SPS
• Relativistic Thermodynamics: Transverse Momentum Distributions in High-Energy Physics
• The horn, the hadron mass spectrum and the QCD phase diagram - the statistical model of hadron production in central nucleus-nucleus collisions
• The lattice QCD phase diagram in and away from the strong coupling limit
• STAR Results from the RHIC Beam Energy Scan-I
• Review of Recent Results from the RHIC Beam Energy Scan
• On Extraction of Chemical Potentials of Quarks from Particle Transverse Momentum Spectra in High Energy Collisions

Cited by in corpus (4)

• Chemical potentials of light hadrons and quarks from yield ratios of negative to positive particles in high energy $pp$ collisions
• Energy dependent chemical potentials of light hadrons and quarks based on transverse momentum spectra and yield ratios of negative to positive particles
• Energy dependent chemical potentials of light particles and quarks from yield ratios of antiparticles to particles in high energy collisions
• Light particle and quark chemical potentials from negatively to positively charged particle yield ratios corrected by removing strong and weak decays