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

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.