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Measurement of the $\overline{B} \to D^{(*)}\pi l\overline{\nu}_l$ Branching Fraction / DELPHI Collaboration
A study of $b$ semileptonic decays into $D$, $D\pi^{\pm}$ and $D^*\pi^{\pm}$ final states is presented.The $D^0$, $D^+$ and $D^{*+}$ mesons are exclusively reconstructed in $Z$ decay data recorded from 1992 to 1995in the DELPHI experiment at LEP. The overall branching fractions are measured to be: $BR(b -> D^0 \ell^- \bar{\nu}_{\ell} X) = (7.04 +/- 0.34 (stat) +/- 0.36 (syst.exp) +/- 0.17 (BR_D))\%,$ $BR(b -> D^+ \ell^- \bar{\nu}_{\ell} X) = (2.72 +/- 0.19 (stat) +/- 0.16 (syst.exp) +/- 0.18 (BR_D))\%$, $BR(b -> D^{*+} \ell^- \bar{\nu}_{\ell} X) = (2.75 +/- 0.17 (stat) +/- 0.13 (syst.exp) +/- 0.09 (BR_D))\%$ where the $D^0$ and $D^+$ results include also contributions from $D^{*0}$ and $D^{*+}$ decays..
hep-ex/0105052; CERN-EP-99-174; CERN-EP-99-174.- Geneva : CERN, 2000 - 25 p. - Published in : Phys. Lett. B 475 (2000) 407-28 Fulltext: ep-1999-174 - PDF; arXiv:hep-ex_0105052 - PDF; External link: Preprint - Please contact the library if you need to access this document.

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