Signals of quark combination at hadronization in pp collisions at root s=200 GeV

We find signals of quark combination at hadronization from the experimental data of p(T) spectra of hadrons at midrapidity in pp collisions at root s = 200 GeV. The first is the constituent quark number scaling property for pT spectra of Omega(-) and phi and that for p(T) spectra of p and rho(0). The second is that p(T) spectra of Lambda, Xi(-), and K-*0 can be self-consistently described using the spectrum of strange quarks from phi data and that of up/down quarks from p data in the equal-velocity combination mechanism. The third is that experimental data for pT spectrum of D*- are also well described by the spectrum of up/down quarks from p data and a spectrum of charm quarks which is consistent with theoretical calculations of the fixed-order next-to-leading-logarithmic approach. These results indicate a similarity between hadron production in pp collisions at root s = 200 GeV and that at LHC energies. We predict p(T) spectra of single-charm hadrons and their spectrum ratios. We suggest systematic measurements in pp collisions at root s = 200 GeV in the future so as to better understand the property of the small parton system created in pp collisions at different collision energies.