Measurement of Semileptonic B Decays into Orbitally Excited Charmed Mesons

Abstract

We present a study of B decays into semileptonic final states containing charged and neutral $D_1(2420)$ and $D_2^{\ast }(2460)$. The analysis is based on a data sample of $208f{b}^{-1}$ collected at the ${\rm Y}(4S)$ 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 $\Delta m=m(D\ast \ast )-m(D)$ distributions. Product branching fractions are determined to be $BR(B^{+}->D_1^0{\ell }^{+}{\nu }_{\ell })xBR(D_1^0->D{\ast }^{+}{\pi }^{-})=(2.97+/-0.17+/-0.17)x10^{-3}$, $BR(B^{+}->D_2^{\ast 0}{\ell }^{+}{\nu }_{\ell })xBR(D_2^{\ast 0}->D^{(\ast )+}{\pi }^{-})=(2.29+/-0.23+/-0.21)x10^{-3}$, $BR(B^0->D_1^{-}{\ell }^{+}{\nu }_{\ell })xBR(D_1^{-}->D{\ast }^0{\pi }^{-})=(2.78+/-0.24+/-0.25)10^{-3}$ and $BR(B^0->D_2^{\ast -}{\ell }^{+}{\nu }_{\ell })xBR(D_2^{\ast -}->D^{(\ast )0}{\pi }^{-})=(1.77+/-0.26+-/0.11)10^{-3}$. In addition we measure the branching ratio $\Gamma (D_2^{\ast }->D{\pi }^{-})/\Gamma (D_2^{\ast }->D^{(\ast )}{\pi }^{-})=0.62+/-0.03+/-0.02$.

arXiv comment7 pages, 1 figure v2: synchronized to version published

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