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Assessing the impact of parton masses in the fragmentation of high-energy particles has been a longstanding goal of experimental and theoretical communities in QCD. One of the most prominent characteristics of a massive splitting is the suppression of collinear branchings, the dead-cone effect. This fundamental property of QCD has until recently eluded a direct experimental discovery. New techniques in unravelling the substructure of heavy-flavour jets have allowed the ALICE collaboration to uncover the dead-cone effect in QCD for the first time (Nature 605 (2022) 440-446). In this cross talk we will explore the role of mass effects in the theoretical description of QCD branchings and present the analysis strategy used by ALICE to measure the dead-cone effect in pp. We will then briefly discuss the importance of parton shower related mass effects in a heavy-ion collision context, as well as some of the experimental challenges that must be overcome to successfully measure them.
Alba Soto-Ontoso is a research fellow in the TH Department at CERN. After obtaining the PhD in 2018 between Frankfurt and Granada universities, she held post-doctoral positions in Brookhaven National Lab and the Institute de Physique Theorique. She mostly works on the theoretical description of Quantum Chromodynamics (QCD) both in proton-proton and heavy-ion collisions at high-energy colliders.
Nima Zardoshti is an experimental physicist working at the ALICE collaboration. He obtained his PhD at the university of Birmingham, working on jet substructure measurements in both pp and heavy ion collisions. He is currently an LD staff at CERN and coordinates the heavy-flavour jet working group in ALICE, with a particular focus on investigating the impact of partonic flavour in QCD parton showers using the substructure of heavy-flavour tagged jets.