Semi-Leptonic b-decay at Intermediate Recoil

Details Semi-Leptonic b-decay at Intermediate Recoil Semi-Leptonic b-decay at Intermediate Recoil

2008-09-02

arxiv.org/abs/0809.0491v2

Phys.Rev.D78:074029,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 6 figures, Replaced figures, small format and typo corrections, added appendix and references

Scientific paper

10.1103/PhysRevD.78.074029

We compute the O(\alpha_s^2) corrections to the differential rate of the semileptonic decay b -> clv at the "intermediate recoil" point, where the c-quark mass and the invariant mass of the leptons are equal. The calculation is based on an expansion around two opposite limits of the quark masses m_{b,c}: m_c ~ m_b and m_c << m_b. The former case was previously studied; we correct and extend that result. The latter case is new. The smooth matching of both expansions provides a check of both. We clarify the discrepancy between the recent determinations of the full NNLO QCD correction to the semileptonic b -> c rate, and its earlier estimate.

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