Heavy quark expansion for the inclusive decay

1994/01/10 by Adam F. Falk, Zoltan Ligeti, Matthias Neubert +1 · 7 citations
Physics and Astronomy · #Bar (unit) #Branching fraction #Electron #Heavy quark effective theory #High-Energy Particle Collisions Research #Lepton #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Polarization (electrochemistry) #Quantum Chromodynamics and Particle Interactions #Quark #hep-ph

paper · pdf · doi:10.1016/0370-2693(94)91206-8

published as Phys.Lett.B326:145-153,1994 · 16pages harvmac

arxiv created 1994/01/10 · openalex publication_date 1994/04/01 · arxiv updated 2011/01/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We calculate the differential decay rate for inclusive B→τ ν X transitions to order 1/m_b² in the heavy quark expansion, for both polarized and unpolarized tau leptons. We show that using a systematic 1/m_b expansion significantly reduces the theoretical uncertainties in the calculation. We obtain for the total branching ratio \rm BR( B→τ ν X)=2.30± 0.25%, and for the tau polarization A_{\rm pol}=-0.706±0.006. From the experimental measurement of the branching ratio at LEP, we derive the upper bound \lo≤ 0.8\gev² for one of the parameters of the heavy quark effective theory.

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