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Laboratoire de Physique des Particules, IN2P3/CNRS et Université de Savoie, F-74941 Annecy-Le-Vieux, France.
Phys Rev Lett. 2009 Jul 31;103(5):051803. doi: 10.1103/PhysRevLett.103.051803.
We present a study of B decays into semileptonic final states containing charged and neutral D1(2420) and D_{2};{}(2460). The analysis is based on a data sample of 208 fb;{-1} collected at the Upsilon(4S) resonance with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. With a simultaneous fit to four different decay chains, the semileptonic branching fractions are extracted from measurements of the mass difference Deltam=m(D;{**})-m(D) distributions. Product branching fractions are determined to be B(B;{+}-->D_{1};{0}l;{+}nu_{l})xB(D_{1};{0}-->D;{+}pi;{-})=(2.97+/-0.17+/-0.17)x10;{-3}, B(B;{+}-->D_{2};{0}l;{+}nu_{l})xB(D_{2};{0}-->D;{()+}pi;{-})=(2.29+/-0.23+/-0.21)x10;{-3}, B(B;{0}-->D_{1};{-}l;{+}nu_{l})xB(D_{1};{-}-->D;{0}pi;{-})=(2.78+/-0.24+/-0.25)x10;{-3} and B(B;{0}-->D_{2};{-}l;{+}nu_{l})xB(D_{2};{-}-->D;{()0}pi;{-})=(1.77+/-0.26+/-0.11)x10;{-3}. In addition we measure the branching ratio Gamma(D_{2};{}-->Dpi;{-})/Gamma(D_{2};{}-->D;{()}pi;{-})=0.62+/-0.03+/-0.02.
我们展示了一项关于B介子衰变为包含带电和中性D1(2420)及D2*(2460)的半轻子末态的研究。该分析基于在SLAC的PEP-II非对称能量B工厂使用BABAR探测器在Upsilon(4S)共振处收集的208 fb⁻¹数据样本。通过对四条不同衰变链的同时拟合，从质量差Δm = m(D**) - m(D)分布的测量中提取半轻子分支比。测得的乘积分支比为B(B⁺→D1⁰l⁺νl)×B(D1⁰→D*⁺π⁻) = (2.97±0.17±0.17)×10⁻³，B(B⁺→D2⁰l⁺νl)×B(D2⁰→D()+π⁻) = (2.29±0.23±0.21)×10⁻³，B(B⁰→D1⁻l⁺νl)×B(D1⁻→D⁰π⁻) = (2.78±0.24±0.25)×10⁻³以及B(B⁰→D2*⁻l⁺νl)×B(D2*⁻→D()⁰π⁻) = (1.77±0.26±0.11)×10⁻³。此外，我们测量了分支比Γ(D2→Dπ⁻)/Γ(D2*→D(*)π⁻) = 0.62±0.03±0.02。
