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New parametrization of the form factors in Bˉ→D?νˉ? decays

机译:Bˉ→D中表单因子的新参数化?νˉ? 衰退

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A new model-independent parametrization is proposed for the hadronic form factors in the semileptonic B ˉ → D ? ν ˉ ? decay. By a combined consideration of the recent experimental and lattice QCD data, we determine precisely the Cabibbo-Kobayashi-Maskawa matrix element | V c b | = 41.01 ( 75 ) × 10 ? 3 and the ratio R D = B R ( B ˉ → D τ ν ˉ τ ) B R ( B ˉ → D ? ν ˉ ? ) = 0.301 ( 5 ) . The coefficients in this parametrization, related to phase shifts by sumrulelike dispersion relations and hence called phase moments, encode important scattering information of the B ˉ D ˉ interactions which are poorly known so far. Thus, we give strong hints about the existence of at least one bound and one virtual B ˉ D ˉ S -wave 0 + states, subject to uncertainties produced by potentially sizable inelastic effects. This formalism is also applicable for any other semileptonic processes induced by the weak b → c transition.
机译:在半填充B形→D中的RoTronic形式因子提出了一种新的型号独立的参数化? νˉ? 衰变。 通过对最近的实验和晶格QCD数据的组合考虑,我们精确地确定了Cabibbo-Kobayashi-Maskawa矩阵元件| V C B | = 41.01(75)×10? 3和比率R d = B r(b≠→dτνντ)b r(bˉ→d?νˉα)= 0.301(5)。 该参数化中的系数与Sumrulelelik分散关系的相移相关,并且所谓的相矩,编码到目前为止已知不知名的B≠Dˉ相互作用的重要散射信息。 因此,我们对存在至少一个绑定的存在和一个虚拟B≠DˉS -WAVE 0 +状态的强烈提示,受到潜在可均匀的非弹性效应产生的不确定性。 这种形式主义也适用于弱B→C过渡诱导的任何其他半透析过程。

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