2006/12/31 by U. Aglietti, Ugo Aglietti, Leonardo Di Giustino +3
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/j.physletb.2007.06.034
published as Phys.Lett.B651:275-292,2007 · 28 pages, stylistic changes, version accepted by journal
openalex publication_date 2007/06/21 · arxiv created 2007/07/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We resum to all orders of perturbation theory the invariant mass distribution of jets initiated by massive quarks. We find that the inclusion of mass terms, in the N-moment space, results in the universal factor deltaN(Q2;m2), taking into account dead-cone effects in gluon emission, which multiplies the massless jet distribution function JN(Q2). The variable N is rescaled by the mass correction parameter r = m2/Q2 << 1 with respect to the standard massless case, being m the quark mass and Q the hard scale. The functions A(alpha) and B(alpha), with alpha = alphaS, appear with a minus sign suppressing collinear effects at large N, as expected. Soft radiation not collinearly enhanced, characteristic of massive charges, makes its appearance with the function D(alpha). Phenomenological applications, such as the resummation of b --> c l nu decay spectra or the inclusion of beauty mass effects in t --> b W decays, are briefly sketched.