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 ($p_{\rm T}$) spectra as a function of charged-particle multiplicity density at mid-pseudorapidity, ${\rm d}N_{\rm ch}/{\rm d}\eta$, in pp collisions at $\sqrt{s}=5.02$ and 13 TeV covering the kinematic range $|\eta| 0$). The transverse momentum spectra are reported for two multiplicity estimators covering different pseudorapidity regions. While the $p_{\rm T}$ spectra exhibit a strong dependence on multiplicity and center-of-mass energy, they show little energy dependence when normalized to the $p_{\rm T}$ spectrum for INEL $>0$. The behavior of the multiplicity dependent spectra from intermediate to high transverse momentum ($6 0$ pp collisions. Within uncertainties, the functional form of $\langle p_{\rm T} \rangle(N_{\rm ch})$ 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. The observations are discussed in terms of multi-parton interactions with large momentum transfer and color reconnection.