Exclusive rare decay b→ sγ of heavy b baryons

Physical review D: Particles and fields 03/2011; 83(5). DOI: 10.1103/PhysRevD.83.054007
Source: arXiv

ABSTRACT We present an analysis on the exclusive rare radiative decay modes Σb→Σγ and Ξb→Ξγ. The transition form factors which parametrize these processes are calculated using QCD light-cone sum rules. The decay widths we predict are Γ(Σb→Σγ)=(7.21±0.04)×10-18 GeV and Γ(Ξb→Ξγ)=(1.34±0.07)×10-16 GeV. The branching ratio of Ξb→Ξγ is predicted to be Br(Ξb→Ξγ)= (3.03±0.10)×10-4.

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    ABSTRACT: We present a systematic discussion of Λb→Λ transition form factors in the framework of soft-collinear effective theory (SCET). The universal soft form factor, which enters the symmetry relations in the limit of large recoil energy, is calculated from a sum-rule analysis of a suitable SCET correlation function. The same method is applied to derive the leading corrections from hard-collinear gluon exchange at first order in the strong coupling constant. We present numerical estimates for form factors and form-factor ratios and their impact on decay observables in Λb→Λμ+μ- decays.
    Physical review D: Particles and fields 01/2012; 85(1).

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