Speaker
Description
Jet substructure measurements provide precision tests of Quantum Chromodynamics through detailed studies of parton shower evolution and hadronization in vacuum. The LHCb experiment exploits its unique forward acceptance and excellent tracking to extend these measurements to low and moderate jet transverse momentum in 𝑝𝑝 collisions at 𝑠√=13 TeV. Recent results include the first measurement of the Lund jet plane for beauty-initiated jets, compared to light-quark–enriched jets, revealing clear mass-dependent modifications to QCD radiation patterns consistent with heavy-quark dynamics and the QCD dead-cone effect. In parallel, LHCb has performed the first measurement of the b-jet mass using a theoretically well-defined flavour-tagging scheme, providing a high-precision test of perturbative QCD and sensitivity to gluon-splitting contributions to heavy-flavour production. These measurements are complemented by studies of hadron production and energy-flow observables within jets, offering a comprehensive view of jet fragmentation at forward rapidity. Together, these results provide stringent constraints on parton shower models and deepen our understanding of QCD jet formation in previously unexplored regions of phase space.
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