Production of light-flavor and single-charmed hadrons in pp collisions at√s=5.02 TeV in an equal-velocity quark combination model  

作　　者：Hai-hong Li Feng-lan Shao Jun Song 李海宏;邵凤兰;宋军(School of Physical Science and Intelligent Engineering,Jining University,Shandong 273155,China;School of Physics and Physical Engineering,Qufu Normal University,Shandong 273165,China)

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

出　　处：《Chinese Physics C》2021年第11期60-71,共12页中国物理C（英文版）

基　　金：Shandong Province Natural Science Foundation(ZR2019YQ06,ZR2019MA053);National Natural Science Foundation of China(11975011);Higher Educational Youth Innovation Science and Technology Program of Shandong Province(2019KJJ010)。

摘　　要：We apply an equal-velocity quark combination model to study the production of light-flavor hadrons and single-charmed hadrons at midrapidity in the pp collisions at √s= 5.02 TeV. We find that the experimental data for the pT spectra of Ω and φ exhibit the quark number scaling property, which clearly indicates the quark combination mechanism at hadronization. Experimental data for the pT spectra of p,Λ,Ξ,Ω,φ and K^(+0) are systematically described by the model. The non-monotonic pT dependence of the Ω/φ ratio is naturally explained, and we find that it is closely related to the shape of the logarithm of the strange quark pT distribution. Using the pT spectra of light-flavor quarks obtained from light-flavor hadrons and the pT spectrum of charm quarks, which is consistent with perturbative QCD calculations, the experimental data for differential cross-sections of D^(0,+), D^(+)_s), and Λ^(+)_(c) as functions of p are systematically described. We predict the differential cross-sections of Ξ^(0,+)_(c) and Ω^(0)_(c) . The ratio Ξ^(0,+)_(c) /D^0) in our model is approximately 0.16, and Ω^(0)_(c) /D^(0) is approximately 0.012, owing to the cascade suppression of strangeness.In addition, the predicted Ξ^(0,+)_(c) /D^0) ratios exhibit the non-monotonic dependence on pT in the low pT range.

关 键 词：HADRONIZATION QUARK combination mechanism heavy-flavor 

分 类 号：O572.33[理学—粒子物理与原子核物理]