Jet measurements with ALICE: substructure, dead cone, charm jets

TL;DR

This paper presents recent jet measurements from ALICE at the LHC, focusing on substructure, dead cone effect, and charm jets, providing new insights into QCD processes and flavor-dependent fragmentation.

Contribution

It reports the first direct measurement of the dead cone in heavy-flavor jets and compares various jet substructure observables for inclusive and charmed jets.

Findings

Groomed jet momentum fractions vary with jet resolution parameters.

First direct observation of the dead cone effect in heavy-flavor jets.

Charmed D0 mesons and Lambda_c+ baryons show specific momentum fraction distributions.

Abstract

A selection of recent jet measurements are presented from the ALICE experiment at the CERN LHC in proton-proton collisions at $\sqrt{s}=13$ TeV, focusing on substructure results for inclusive and charmed jets. The groomed jet momentum fractions ($z_g$) of inclusive full jets are shown for various jet resolution parameters, and $z_g$, the groomed splitting radius ($\theta_g$) as well as the number of soft drops ($n_{\rm SD}$) of inclusive and charmed charged-particle jets are compared. The first direct measurement of the dead cone in heavy-flavor jets is also presented. Furthermore, the parallel momentum fractions of charmed D$^0$ mesons and $\Lambda_\mathrm{c}^+$ baryons are shown. Besides serving as a reference for jet structure modification measurements in heavy-ion collisions, these results provide new insight to QCD parton shower properties and flavor-dependent fragmentation processes.