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Form Factors for Lambda_b -> Lambda Transitions in SCET

We present a systematic discussion of Lambda_b -> Lambda 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 Lambda_b -> Lambda mu^+ mu^- decays.

preprint2012arXivOpen access
Thorsten FeldmannMatthew W. Y. Yip
hep-exhep-ph
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Thorsten FeldmannMatthew W. Y. Yip

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