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We study underlying-event observables in inelastic proton-proton (pp)collisions at a centre-of-mass energy of $\sqrt{s} = 13$ TeV with identifiedlight and heavy-flavor triggers using the PYTHIA 8 event generator. The studyis performed as a function of the transverse momentum of the leading particle($p_\mathrm{T}^{\rm trigger}$). While at high $p_\mathrm{T}^{\rm trigger}$($>10$ GeV/$c$) the underlying-event activity is independent of the leadingparticle species, at intermediate $p_\mathrm{T}^{\rm trigger}$($2<p_\mathrm{T}^{\rm trigger}<8$ GeV/$c$) it is larger in pion-triggeredevents than in events triggered with B mesons. Moreover, the underlying eventin pion-triggered events, the majority of which are initiated by gluons, showsa stronger effect of color reconnection than events triggered with B-hadrons,that are mostly initiated by quark jets. The effect is observed at bothhadronic and partonic level. Given that color reconnection affects theinteraction among final partons before the hadronization, and that in thestring model quarks (gluons) are connected to one (two) string piece(s), weconclude that the observed effect can be attributed to differences in theinteractions of gluon and quark jets with the underlying event.

Probing the interaction of semi-hard quarks and gluons with the underlying event in light- and heavy-flavor triggered proton-proton collisions