Multiplicity dependent $p_T$ distributions of identified particles in pp collisions at 7 TeV within HIJING/$B\bar{B}$ v2.0 model

Abstract

Effects of strong longitudinal color fields (SCF) on the identified (anti)particle transverse momentum ($p_T$) distributions in $pp$ collision at $\sqrt{s}$ = 7 TeV are investigated within the framework of the {\small HIJING/BB̄ v2.0} model. The comparison with the experiment is performed in terms of the correlation between mean transverse momentum ($⟨p_t⟩$) and multiplicity (N${}_{ch}^{\ast }$) of charged particles at central rapidity, as well as the ratios of the $p_T$ distributions to the one corresponding to the minimum bias (MB) pp collisions at the same energy, each of them normalized to the corresponding charged particle density, for high multiplicity \mbox{(HM, N_{ch}>100)} and low multiplicity \mbox{(LM, N_{ch}<100)} class of events. The theoretical calculations show that an increase of the strength of color fields (as characterized by the effective values of the string tension $\kappa$), from $\kappa$ = 2 GeV/fm to $\kappa$ = 5 GeV/fm from LM to HM class of events, respectively, lead to a ratio at low and intermediate $p_T$ (i.e., \mbox{$1$GeV/{\it c} $<p_T<6$ GeV/{\it c}}) consistent with recent data obtained at LHC by the ALICE Collaboration.

Comments: 14 pages and 11 figures. arXiv admin note: text overlap with arXiv:1306.0885