Kaon and pion production in central Au + Au collisions at

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• 作者：BRAHMS Collaboration ; I.C. Arsene ; I.G. Bearden ; D. Beavis ; S. Bekele ; C. Besliu ; B. Budick ; H. B&#xf8 ; ggild ; C. Chasman ; C.H. Christensen ; P. Christiansen ; H.H. Dalsgaard ; R. Debbe ; J.J. Gaardh&#xf8
• 关键词：Heavy ion collisions ; Strangeness enhancement ; Baryon chemical potential
• 刊名：Physics Letters B
• 出版年：2010
• 出版时间：5 April 2010
• 年：2010
• 卷：687
• 期：1
• 页码：36-41
• 全文大小：318 K

文摘

Invariant p_T 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 . 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 . The rapidity dependence of the π⁻/π⁺ ratio is consistent with a small increase towards forward rapidities while the K⁻/K⁺ and ratios show a steep decrease to 0.3 for kaons and 0.022 for protons at y3. 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 ratio, being the driving parameter.