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

We present a study of the inclusive charged-particle transverse momentum ( ${p}_{T}$ ) spectra as a function of charged-particle multiplicity density at mid-pseudorapidity, $d{N}_{\mathrm{ch}}/d\eta $ , in pp collisions at $\sqrt{s}=5.02$ and 13 TeV covering the kinematic range $|\eta |<0.8$ and $0.15<{p}_{T}<20$ GeV/c. The results are presented for events with at least one charged particle in $|\eta |<1$ (INEL $\phantom{\rule{0.166667em}{0ex}}>0$ ). The ${p}_{T}$ spectra are reported for two multiplicity estimators covering different pseudorapidity regions. The ${p}_{T}$ spectra normalized to that for INEL $\phantom{\rule{0.166667em}{0ex}}>0$ show little energy dependence. Moreover, the high- ${p}_{T}$ yields of charged particles increase faster than the charged-particle multiplicity density. The average ${p}_{T}$ 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 ${p}_{T}$ is higher (smaller) than that measured in INEL $\phantom{\rule{0.166667em}{0ex}}>0$ pp collisions. Within uncertainties, the functional form of $⟨{p}_{T}⟩\left({N}_{\mathrm{ch}}\right)$ is not affected by the spherocity selection. While EPOS LHC gives a good description of many features of data, PYTHIA overestimates the average ${p}_{T}$ in jet-like events.