Bottom-quark fragmentation in top-quark decay

2001/10/24 by Gennaro Corcella, Alexander Mitov, Alexander D. Mitov
Physics and Astronomy · #B meson #Bottom quark #Fragmentation (computing) #Gluon #Hadron #Hadronization #High-Energy Particle Collisions Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Parton #Perturbative QCD #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #Resummation #Top quark #hep-ex #hep-ph

paper · pdf · doi:10.1016/s0550-3213(01)00639-3

published as Nucl.Phys.B623:247-270,2002 · 25 pages, 9 figures

arxiv created 2001/10/24 · openalex publication_date 2002/02/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We study the fragmentation of the b quark in top decay in NLO QCD, within the framework of perturbative fragmentation, which allows one to resum large logarithms ∼log (m_t²/m_b²). We show the b-energy distribution, which we compare with the exact \cal O (α_S) result for a massive b quark. We use data from e⁺e^- machines in order to describe the b-quark hadronization and make predictions for the energy spectrum of b-flavoured hadrons in top decay. We also investigate the effect of NLL soft-gluon resummation in the initial condition of the perturbative fragmentation function on parton- and hadron-level energy distributions.

Citations

• Asymptotic freedom in parton language
• QCD radiation off heavy particles
• Large-p⊥ hadroproduction of heavy quarks
• Direct measurement of the top quark mass by the DØ Collaboration