1997/05/30 by CLEO Collaboration, M. Athanas, M. Athans et al +99 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1103/physrevlett.79.2208
published as Phys.Rev.Lett.79:2208-2212,1997 · 11 pages, postscript file also available through http://w4.lns.cornell.edu/public/CLNS
arxiv created 1997/05/30 · openalex publication_date 1997/09/22 · arxiv updated 2010/04/08 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We have studied the decay B\ensuremath→Dl\ensuremathν, where l\phantom\rule0ex0ex=\phantom\rule0ex0exe or \ensuremathμ. From a fit to the differential decay rate d\ensuremathγ/dw we measure the rate normalization FD(1)|Vcb| and form factor slope \stackrel^\ensuremathρD2, and, using measured values of \ensuremathτB, find \ensuremathγ(B\ensuremath→Dl\ensuremathν)\phantom\rule0ex0ex=\phantom\rule0ex0ex(12.0\ifmmode±\else\textpm\fi0.9\ifmmode±\else\textpm\fi2.1)ns^\ensuremath-1. The resulting branching fractions are B(B0\ensuremath→D+l^\ensuremath-\ensuremathν)\phantom\rule0ex0ex=\phantom\rule0ex0ex(1.87\ifmmode±\else\textpm\fi0.15\ifmmode±\else\textpm\fi0.32)% and B(B^\ensuremath-\ensuremath→D0l^\ensuremath-\ensuremathν)\phantom\rule0ex0ex=\phantom\rule0ex0ex(1.94\ifmmode±\else\textpm\fi0.15\ifmmode±\else\textpm\fi0.34)%. The form factor parameters are in agreement with those measured in B\ensuremath→D*l\ensuremathν decays, as predicted by heavy quark effective theory.