Abstract
Jet substructure observables and applications of jet grooming techniques in heavy-ion collisions are still in its infancy and provide new alleys for studying medium modifications of perturbative degrees of freedom. We note that these measurements, given the right transverse momentum range, can be uniquely sensitive to rare medium-induced emissions inside of the jet cone. This corresponds to an infrared enhancement that would, for instance, affect the distribution of the groomed momentum-sharing variable zg measured using the SoftDrop procedure.
Highlights
Jet quenching currently refers to a wide spectrum of observables, spanning single-inclusive hadron production at high-pT to modifications of inter-jet distributions in heavy-ion collisions
These modifications are expected to arise from a complex interplay of elastic and inelastic processes which alter the distribution within the jet cone and propagate a fraction of the total jet energy out of it
Novel measurements of jet substructure observables prompt us to explore these issues from a new perspective
Summary
Jet quenching currently refers to a wide spectrum of observables, spanning single-inclusive hadron production at high-pT to modifications of inter-jet distributions in heavy-ion collisions. We argue below that a set of jet substructure observables that pin down details of the hard splitting, which will be defined shortly, provide a possibly more direct measurement of hard medium-induced radiation. This could provide a first observation of the generic mechanism that is expected to drive jet modifications and energy loss, codified through the medium parameter qand size L. The zg-distribution appears to be steeper in heavy-ion collisions than in proton-proton collisions and the effect seems to decrease with increasing jet energy
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