Speaker
Description
Jet substructure measurements at the LHC produce precision tests of jet formation and fragmentation in vacuum as well as at the high temperatures and densities formed in heavy-ion collisions. Jets containing a heavy-flavor hadron drive these QCD measurements into a regime where parton mass and colour factors are critical, pushing the limits of theoretical calculations both in-vacuum and in-medium. Mapping out individual emissions in the Lund jet plane for heavy-flavour jets and comparing to light-quark-enriched jets tagged by a Z boson reveals significant mass-dependence to jet fragmentation, offering a decisive channel to decipher in-medium modification to jet fragmentation across different kinematics. At the same time, measuring heavy-flavour jet mass with a theoretically-safe flavour tagging algorithm for the first time tests perturbative QCD at unprecedented theoretical precision and probes the gluon splitting contribution to heavy-flavour production, a yet-unobserved probe of how the medium resolves quark entanglement. The LHCb collaboration presents recent jet substructure results at forward rapidity in $pp$ collisions at centre-of-mass energy $\sqrt{s} = 13$ TeV. These measurements are compared to theoretical predictions, providing new insight on QCD fragmentation at forward rapidity and at low and moderate values of jet transverse momentum. These results provide a baseline for future measurements of jet quenching in PbPb collisions.
| Category | Experiment |
|---|---|
| Collaboration (if applicable) | LHCb |
