New insights into hadron production mechanism from pT spectra in pp collisions at √s=7 TeV

作者：Gou, Xing-rui; Shao, Feng-lan^*; Wang, Rui-qin; Li, Hai-hong; Song, Jun^*

来源：PHYSICAL REVIEW D, 2017, 96(9): 094010.

DOI：10.1103/PhysRevD.96.094010

• STRANGE BARYON PRODUCTION
• PB COLLISIONS
• MULTIPLICITY DEPENDENCE
• FRAGMENTATION
• ASYMMETRIES
• MESONS
• PROTON
• MODEL
• X(F)
• KAON

We show that the experimental data of midrapidity p(T) spectra for p, Lambda, Xi, Omega(-), K(892)*(0), and Xi(1530)*(0) in minimum-bias pp collisions at root s = 7 TeV can be well fitted by the quark combination mechanism with the parametrized up(down) quark spectrum and strange quark spectrum at hadronization. The averaged transverse momentum < p(T)> and spectrum ratios such as Xi/Lambda and Omega/phi calculated from quark combination reproduce the data quite well. The available data of hadronic p(T) spectra released by ALICE collaboration in the first three high-multiplicity classes of pp collisions at root s = 7 TeV are also well fitted. The extracted quark spectra at hadronization exhibit a dependence on the multiplicity class and also show a certain similarity to those obtained in p-Pb collisions at LHC and in relativistic heavy ion collisions. We make predictions for other hadrons, and propose two scaling behaviors among decuplet baryons and vector mesons as the effective probe of hadron production mechanism at such high collision energies.

• 出版日期2017-11-14
• 单位曲阜师范大学; 济宁学院