Charged-particle production as a function of multiplicity and transverse spherocity in pp collisions at $\sqrt{s}$ = 5.02 and 13 TeV

Abstract

We present a study of the inclusive charged-particle transverse momentum ($p_{\mathrm{T}}$) spectra as a function of charged-particle multiplicity density at mid-pseudorapidity, $\mathrm{d}{N}_{\mathrm{ch}}/\mathrm{d}\eta$, in pp collisions at $\sqrt{s}$ = 5.02 and 13 TeV covering the kinematic range $|\eta |<0.8$ and $0.15<p_{\mathrm{T}}<20$ GeV/$c$. The results are presented for events with at least one charged particle in $|\eta |<1$ (INEL$>0$). The $p_{\mathrm{T}}$ spectra are reported for two multiplicity estimators covering different pseudorapidity regions. The $p_{\mathrm{T}}$ spectra normalized to that for INEL $>0$ show little energy dependence. Moreover, the high-$p_{\mathrm{T}}$ yields of charged particles increase faster than the charged-particle multiplicity density. The average $p_{\mathrm{T}}$ as a function of multiplicity and transverse spherocity is reported for pp collisions at $\sqrt{s}=13$ TeV. For low- (high-) spherocity events, corresponding to jet-like (isotropic) events, the average $p_{\mathrm{T}}$ is higher (smaller) than that measured in INEL $>0$ pp collisions. Within uncertainties, the functional form of $⟨p_{\mathrm{T}}⟩(N_{\mathrm{ch}})$ is not affected by the spherocity selection. While EPOS LHC gives a good description of many features of data, PYTHIA overestimates the average $p_{\mathrm{T}}$ in jet-like events.

arXiv comment29 pages, 11 captioned figures, 4 table, authors from page 24, published version, figures at http://alice-publications.web.cern.ch/node/5287

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