Production of single-charm hadrons by the quark-combination mechanism in p-Pb collisions at root s(NN)=5.02 TeV

摘要

If quark-gluon plasma (QGP)-like medium is created in p-Pb collisions at extremely high collision energies, charm quarks that move in the medium can hadronize by capturing the comoving light quark(s) or antiquark(s) to form the charm hadrons. Using light quark p(T) spectra extracted from the experimental data of light-flavor hadrons and a charm quark pT spectrum that is consistent with perturbative QCD calculations, the central-rapidity data of pT spectra and the spectrum ratios for D mesons in the low-p(T) range (p(T) less than or similar to 7 GeV/c) in minimum-bias p-Pb collisions at root s(NN) = 5.02 TeV are well described by the quark combination mechanism in equal-velocity combination approximation. The Lambda(+)(c)/D-0 ratio in quark combination mechanism exhibits the typical increase-peak-decrease behavior as the function of p(T), and the shape of the ratio for p(T) greater than or similar to 3 GeV/c is in agreement with the data of the ALICE Collaboration in central rapidity region -0.96 y 0.04 and the preliminary data of the LHCb Collaboration in forward rapidity region 1.5 y 4.0. The global production of single-charm baryons is quantified using the data and the possible enhancement (relative to light flavor baryons) is discussed. The pT spectra of Xi(0)(c), Omega(0)(c) in minimum-bias events and those of single-charm hadrons in high-multiplicity event classes are predicted, which serves as the further test of the possible change of the hadronization characteristic for low-pT charm quarks in the small system created in p-Pb collisions at Large Hadron Collider energies.