Temperature-dependent cross sections for πφ and ρφ nonresonant reactions in hadronic matter  

作　　者：罗志峰 许晓明 

机构地区：[1]Department of Physics,Shanghai University

出　　处：《Chinese Physics C》2012年第9期836-845,共10页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (11175111)

摘　　要：With a potential of which the large-distance part reflects lattice gauge results and of which the short-distance part is given by one gluon exchange plus perturbative one- and two-loop corrections, the Schrodinger equation brings about temperature dependence of meson masses and mesonic quark-antiquark relative-motion wave functions. The ground-state meson masses drop with increasing temperature. The tran- sition amplitude calculated from the potential, the meson masses and the wave functions gives temperaturedependent cross sections for the five nonresonant reactions πФ →, KK^-＊ （or K^＊K^-）, πФ→ K^＊K^-＊, ρФ→ KK^-, ρФ→ KK^-＆ （or KK^-＊） and ρФ →KK^-＊ . The numerical temperature-dependent cross sections are parametrized. The peak cross section of either πФ →＊ KK^-＊ or πФ →K^＊K^＊- increases from T = 0 to T = 0.75Tc and decreases with further increasing temperature. The cross section for ρФ → KK^- , ρФ→KK^-＊or ρФ → K^＊K^-＊ has a decreasing trend while the temperature increases from 0.75Tc.With a potential of which the large-distance part reflects lattice gauge results and of which the short-distance part is given by one gluon exchange plus perturbative one- and two-loop corrections, the Schrodinger equation brings about temperature dependence of meson masses and mesonic quark-antiquark relative-motion wave functions. The ground-state meson masses drop with increasing temperature. The tran- sition amplitude calculated from the potential, the meson masses and the wave functions gives temperaturedependent cross sections for the five nonresonant reactions πФ →, KK^-＊ （or K^＊K^-）, πФ→ K^＊K^-＊, ρФ→ KK^-, ρФ→ KK^-＆ （or KK^-＊） and ρФ →KK^-＊ . The numerical temperature-dependent cross sections are parametrized. The peak cross section of either πФ →＊ KK^-＊ or πФ →K^＊K^＊- increases from T = 0 to T = 0.75Tc and decreases with further increasing temperature. The cross section for ρФ → KK^- , ρФ→KK^-＊or ρФ → K^＊K^-＊ has a decreasing trend while the temperature increases from 0.75Tc.

关 键 词：meson-phi reaction quark-interchange process cross section 

分 类 号：O572.33[理学—粒子物理与原子核物理]