Typeset Using Revt E X
نویسنده
چکیده
The decays B+ → D∗+ s γ and B+ → D∗+γ can be used for an extraction of |Vub|. When the b and c quarks are nearly degenerate the rate for these modes can be determined in terms of other observed rates, namely BB mixing and D → Dγ decay. To this end we introduce a novel application of heavy quark and flavor symmetries. Although somewhat unrealistic, this limit provides us with a first estimate of these rates. 12.15.Hh, 12.39.Hg, 13.40.Hq, 13.25.Hw Typeset using REVTEX [email protected] [email protected] 1
منابع مشابه
Typeset Using Revt E X 1
The HQET/NRQCD Lagrangian is computed to order α/m3. The computation is performed using dimensional regularization to regulate the ultraviolet and infrared divergences. The results are consistent with reparametrization invariance to order 1/m3. Some subtleties in the matching conditions for NRQCD are discussed. Typeset using REVTEX 1
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