Charged-particle production as a function of multiplicity and transverse spherocity in pp collisions at s√=5.02 and 13 TeV

Abstract

We present a study of the inclusive charged-particle transverse momentum (pT) spectra as a function of charged-particle multiplicity density at mid-pseudorapidity, dNch/dη, in pp collisions at√s=5.02 and 13 TeV covering the kinematic range|η|<0.8 and 0.15<pT<20 GeV/c. The results are presented for events with at least one charged particle in|η|<1(INEL>0). The pT spectra are reported for two multiplicity estimators covering different pseudorapidity regions. The pT spectra normalized to that for INEL>0 show little energy dependence. Moreover, the high-pT yields of charged particles increase faster than the charged-particle multiplicity density. The average pT as a function of multiplicity and transverse spherocity is reported for pp collisions at√s=13 TeV. For low- (high-) spherocity events, corresponding to jet-like (isotropic) events, the aver-agepTis higher (smaller) than that measured in INEL>0pp collisions. Within uncertainties, the functional form of〈pT〉(Nch) is not affected by the spherocity selection. While EPOS LHC gives a good description of many features of data, PYTHIA over estimates the average pT in jet-like events