Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2011-03-02
PoS (ICHEP 2010) 265
Physics
High Energy Physics
High Energy Physics - Experiment
4 pages, 5 figures. Presented at the 35th International Conference of High Energy Physics, Paris, France, 22nd-28th July 2010
Scientific paper
We measure partial branching fractions for the inclusive charmless semileptonic decay of $\Bxulnu$, and present determinations of the CKM matrix element $\Vub$. This analysis is based on a sample of 467 million $\FourS$ decays into $\BB$ pairs, collected with the \babar\ detector at the PEP-II $e^{+} e^{-}$ storage rings. We select events where one of the B mesons is fully reconstructed in a hadronic decay mode and the other B decays semileptonically into an electron or a muon. We then use the invariant mass, $\mx$, of the hadronic system, the invariant mass squared, $q^{2}$, of the lepton and neutrino pair, the lepton momentum in the in the $B$ meson rest frame $\Pl$, the kinematic variable $P_{+}$ or one of their combinations as discriminating variables to isolate $\Bxulnu$ decays from the background. We then measure the partial branching fractions in various regions of phase space These partial branching fractions are translated into values of $\Vub$ using several theoretical calculations. An estimate based on the most inclusive analysis gives $\Vub = (4.31\pm 0.35) \times 10^{-3}$. Furthermore, we place a limit on isospin breaking in $B\to X_u\ell\nu$ decays of 9% at 90% C.L. using separate measurements of partial branching ratios for $B^0$ and $B^+$.
BABAR collaboration for the
Sigamani M.
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