Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-03-10
Phys.Rev. D72 (2005) 034036
Physics
High Energy Physics
High Energy Physics - Phenomenology
41 pages, 20 figures, v2: few references added, slightly extended discussion (2 figures added to illustrate m_b dependence), v
Scientific paper
10.1103/PhysRevD.72.034036
We study the Lambda_QCD/M_B corrections from subleading shape functions in inclusive B-meson decays. We propose a natural and smooth interpolation from the endpoint region to the full phase space, and derive expressions for the triple differential decay rate in B -> X_u l nu and the photon energy spectrum in B -> X_s gamma. Our results are valid to order Lambda_QCD/M_B for hadronic invariant masses of order Lambda_QCD M_B and to order Lambda_QCD^2/M_B^2 for larger hadronic masses. They allow a systematic investigation of the transition between the separate regimes of the local and nonlocal expansions, and can be used to study decay distributions in any kinematic variables. We consider several examples of interest and point out that a combined measurement of hadronic energy and invariant mass provides an alternative to the extraction of |V_ub| which is largely independent of shape function effects and in principle allows a higher accuracy than the combined measurement of leptonic and hadronic invariant masses. We perform the expansion directly in QCD light-cone operators, and give a discussion of the general basis of light-cone operators. Reparametrization invariance under the change of the light-cone direction reduces the number of independent shape functions. We show that differing previous results for the lepton energy spectrum obtained from different choices of light-cone coordinates are in agreement.
No associations
LandOfFree
Full-Phase-Space Twist Expansion in Semileptonic and Radiative B-Meson Decays does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Full-Phase-Space Twist Expansion in Semileptonic and Radiative B-Meson Decays, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Full-Phase-Space Twist Expansion in Semileptonic and Radiative B-Meson Decays will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-345290