2019/05/31 by ALICE Collaboration · 1 citation
Physics and Astronomy · #nucl-ex #hep-ex
paper · pdf · doi:10.1140/epjc/s10052-019-7350-y
published as Eur.Phys.J. C79 (2019) no.10, 857 · 29 pages, 11 captioned figures, 4 table, authors from page 24, published version, figures at http://alice-publications.web.cern.ch/node/5287
arxiv created 2019/11/08 · arxiv updated 2019/11/11
We present a study of the inclusive charged-particle transverse momentum (p\rm T) spectra as a function of charged-particle multiplicity density at mid-pseudorapidity, \rm dN\rm ch/\rm dη, in pp collisions at √(s) = 5.02 and 13 TeV covering the kinematic range |η|<0.8 and 0.15<p_\rmT<20 GeV/c. The results are presented for events with at least one charged particle in |η|<1 (INEL >0). The p\rm T spectra are reported for two multiplicity estimators covering different pseudorapidity regions. The p\rm T spectra normalized to that for INEL >0 show little energy dependence. Moreover, the high-p\rm T yields of charged particles increase faster than the charged-particle multiplicity density. The average \itp\rm T 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 average p\rm T is higher (smaller) than that measured in INEL >0 pp collisions. Within uncertainties, the functional form of ⟨ p\rm T ⟩(N\rm ch) is not affected by the spherocity selection. While EPOS LHC gives a good description of many features of data, PYTHIA overestimates the average p\rm T in jet-like events.