2009/11/30 by BRAHMS Collaboration, I. G. Bearden, I. C. Arsene +41 · 1 citation
Engineering · Physics and Astronomy · #High-Energy Particle Collisions Research #Nuclear reactor physics and engineering #Physics #Quantum Chromodynamics and Particle Interactions #Statistical physics #nucl-ex
paper · pdf · doi:10.1016/j.physletb.2010.02.078
published as Phys.Lett.B687:36-41,2010 · Submitted to PLB, 6 journal pages, 7 figures
openalex publication_date 2010/03/08 · arxiv created 2010/03/12 · arxiv updated 2015/03/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Invariant pT spectra and rapidity densities covering a large rapidity range(-0.1 < y < 3.5) are presented for π± and K± mesons from central Au+Au collisions at √sNN = 62.4 GeV. The mid-rapidity yields of meson particles relative to their anti-particles are found to be close to unity (π-/π+ ∼ 1, K-/K+ ∼ 0.85) while the anti-proton to proton ratio is p/p ∼ 0.49. The rapidity dependence of the π-/π+ ratio is consistent with a small increase towards forward rapidities while the K-/K+ and p/p ratios show a steep decrease to ∼ 0.3 for kaons and 0.022 for protons at y∼ 3. It is observed that the kaon production relative to its own anti-particle as well as to pion production in wide rapidity and energy ranges shows an apparent universal behavior consistent with the baryo-chemical potential, as deduced from the p/p ratio, being the driving parameter.