We present a measurement of the $B \to \omega \ell \nu$ branching fraction based on a sample of 467 million BB pairs recorded by the BaBar detector at the SLAC PEP-2 e+e- collider. We observe $1125 \pm 131$ signal decays, corresponding to a branching fraction of $\BR(B \to \omega \ell \nu$) = (1.21 \pm 0.14 \pm 0.08) \times 10^{-4}$, where the first error is statistical and the second is systematic. The dependence of the decay rate on $q^2$, the momentum transfer squared to the lepton system, is compared to QCD predictions of the form factors based on a quark model and light-cone sum rules.
Branching fraction measurement of B^{+}→ωℓ^{+}ν decays
BETTONI, Diego;BOZZI, Concezio;CALABRESE, Roberto;CIBINETTO, Gianluigi;FIORAVANTI, Elisa;GARZIA, Isabella;LUPPI, Eleonora;SANTORO, Valentina;
2013
Abstract
We present a measurement of the $B \to \omega \ell \nu$ branching fraction based on a sample of 467 million BB pairs recorded by the BaBar detector at the SLAC PEP-2 e+e- collider. We observe $1125 \pm 131$ signal decays, corresponding to a branching fraction of $\BR(B \to \omega \ell \nu$) = (1.21 \pm 0.14 \pm 0.08) \times 10^{-4}$, where the first error is statistical and the second is systematic. The dependence of the decay rate on $q^2$, the momentum transfer squared to the lepton system, is compared to QCD predictions of the form factors based on a quark model and light-cone sum rules.File in questo prodotto:
Non ci sono file associati a questo prodotto.
I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.