Constituent quark number scaling from strange hadron spectra in pp collisions at ■=13 TeV  

作　　者：Jian-Wei Zhang Hai-Hong Li Feng-Lan Shao Jun Song 张建伟;李海宏;邵凤兰;宋军(School of Physics and Engineering,Qufu Normal University,Shandong 273165,China;Department of Physics,Jining University,Shandong 273155,China)

机构地区：[1]School of Physics and Engineering,Qufu Normal University,Shandong 273165,China [2]Department of Physics,Jining University,Shandong 273155,China

出　　处：《Chinese Physics C》2020年第1期86-98,共13页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(11575100);by Shandong Province Natural Science Foundation(ZR2019YQ06,ZR2019MA053);by A Project of Shandong Province Higher Educational Science and Technology Program(J18KA228)

摘　　要：We show that the p_T spectra ofΩ^-andφat midrapidity in the inelastic events in pp collisions at■=13 TeV exhibit a constituent quark number scaling property,which is a clear signal of quark combination mechanism at hadronization.We use a quark combination model with equal velocity combination approximation to systematically study the production of identified hadrons in pp collisions at■=13 TeV.The midrapidity spectra for protons,∧,Ξ^-,Ω^-,φand K~*in the inelastic events are simultaneously fitted by the model.The multiplicity dependence of the yields of these hadrons are also well understood.The strong p_T dependence of the p/φratio is well explained by the model,which further suggests that the production of two hadrons with similar masses is determined by their quark content at hadronization.The p_T spectra of strange hadrons at midrapidity in different multiplicity classes in pp collisions at■=13 TeV are predicted for further tests of the model.The midrapidity p_T spectra of soft(p_T<2 GeV/c)strange quarks and up/down quarks at hadronization in pp collisions at■=13 TeV are extracted.We show that the p_T spectra of Ω^- and φ at midrapidity in the inelastic events in pp collisions at ■=13 TeV exhibit a constituent quark number scaling property,which is a clear signal of quark combination mechanism at hadronization.We use a quark combination model with equal velocity combination approximation to systematically study the production of identified hadrons in pp collisions at ■=13 TeV.The midrapidity spectra for protons,∧,Ξ^-,Ω^-,φ and K~* in the inelastic events are simultaneously fitted by the model.The multiplicity dependence of the yields of these hadrons are also well understood.The strong p_T dependence of the p/φ ratio is well explained by the model,which further suggests that the production of two hadrons with similar masses is determined by their quark content at hadronization.The p_T spectra of strange hadrons at midrapidity in different multiplicity classes in pp collisions at ■=13 TeV are predicted for further tests of the model.The midrapidity p_T spectra of soft (p_T <2 GeV/c)strange quarks and up/down quarks at hadronization in pp collisions at ■=13 TeV are extracted.

关 键 词：strange hadron production quark combination HADRONIZATION quark-gluon plasma 

分 类 号：O572.3[理学—粒子物理与原子核物理]