Studying hadronization and QCD dynamics with heavy flavor jet substructure at LHCb

Jet production at the LHC provides an invaluable probe of QCD dynamics ranging from initial-state parton distributions to final-state jet fragmentation functions. High-precision perturbative calculations for jet substructure have recently become available, allowing direct comparison of experimental measurements to theory. Measurements of jet substructure therefore offer a direct test of first-principles theoretical prescriptions for jet formation and fragmentation in perturbative QCD. Selecting jets containing a heavy-flavor hadron extends tests of QCD fragmentation to a regime where parton mass and color factors play a crucial role, probing the limits of modern perturbative calculations. Recent jet substructure measurements in pp collisions at 13 TeV from LHCb will be presented, including jet mass for groomed and ungroomed beauty quark jets as well as the Lund jet plane for beauty and light quark jets, sensitive to the dead cone effect.