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arXiv · 0808.0333

Measurement of Semileptonic B Decays into Orbitally Excited Charmed Mesons

The BABAR Collaboration·B. Aubert
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Abstract

We present a study of B decays into semileptonic final states containing charged and neutral $D_1(2420)$ and $D_2^*(2460)$. The analysis is based on a data sample of $208 fb^{-1}$ collected at the $Υ(4S)$ 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 $Δm=m(D**)-m(D)$ distributions. Product branching fractions are determined to be $BR(B^+ -> D_1^0 \ell^+ ν_{\ell}) x BR(D_1^0 -> D*^+ π^-) = (2.97 +/- 0.17 +/- 0.17) x 10^{-3}$, $BR(B^+ -> D_2^{*0} \ell^+ ν_{\ell}) x BR(D_2^{*0} -> D^{(*)+} π^-) = (2.29 +/- 0.23 +/- 0.21) x 10^{-3}$, $BR(B^0 -> D_1^- \ell^+ ν_{\ell}) x BR(D_1^- -> D*^0 π^-) = (2.78 +/- 0.24 +/- 0.25) 10^{-3}$ and $BR(B^0 -> D_2^{*-} \ell^+ ν_{\ell}) x BR(D_2^{*-} -> D^{(*)0} π^-) = (1.77 +/- 0.26 +-/ 0.11) 10^{-3}$. In addition we measure the branching ratio $Γ(D_2^* -> D π^-)/Γ(D_2^* -> D^{(*)} π^-) = 0.62 +/- 0.03 +/- 0.02$.

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The BABAR Collaboration, B. Aubert. 2009-08-20. Measurement of Semileptonic B Decays into Orbitally Excited Charmed Mesons. https://doi.org/10.1103/physrevlett.103.051803

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