Decay Constants fD ∗ s
نویسنده
چکیده
We calculate the decay constant of Ds and D ∗ s with B̄ 0 → D+l−ν and B̄0 → D+D s decays. In our analysis we assume the factorization ansatz and use two different form factor behaviours (constant and monopole-type) for F0(q 2). We also consider the QCDpenguin contributions in hadronic decays within the NDR renormalization scheme in a NLO calculation. We estimate the decay constant of the Ds meson to be 219± 46 MeV for (pole/pole)type form factor and 239± 50 MeV for (pole/constant)-type form factor. For D s meson, we predict fD∗ s = 336 ± 79 MeV , and fD∗ s/fDs = 1.41 ± 0.41 for (pole/constant)-type form factor. PACS index : 12.15.-y, 13.20.-v, 13.25.Hw, 14.40.Nd, 14.65.Fy Keywards : Factorization, Non-leptonic Decays, Decay Constant, Penguin Effects ∗Monbushou Research Fellow Email: [email protected], [email protected]
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