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- W2055678135 abstract "We present the first measurement of the $B^0to X_{u}^- ell^+ {nu_ell} $ partial branching fraction in the end-point region of the lepton momentum spectrum, above the threshold for $Bto X_cell {nu_ell}$ decays. The analysis is based on a sample of 383 million $Upsilon(4S)$ decays into $B{bar B}$ pairs collected with the {sc BaBar} detector at the PEP-II $e^+e^-$ storage rings. We select $B^0{bar B}^0$ events by partially reconstructing one $B$ meson via the ${bar B}^0to D^{*+} ell^- bar{nu}_ell$ decays then select $B^0to X_{u}^- ell^+ {nu_ell} $ decays identifying a second high momentum lepton. In the momentum interval ranging from 2.3 to 2.6 GeV/c we measure the partial branching fraction $Delta{cal B}(B^0to X_uellnu)=(1.30pm0.21_{stat}pm0.07_{syst})times 10^{-4}$ where the first error is statistical and the second is systematic. By comparing this measurement with the one obtained from untagged B decays we obtain $R^{+/0}=Delta{cal B}(B^0to X_uellnu)/Delta{cal B}(B^+to X_uellnu)= 1.18 pm 0.35_{stat} pm 0.17_{syst}$. Using this measurement we extract a limit on the contributions from processes breaking isospin symmetry in charmless semileptonic B decays." @default.
- W2055678135 created "2016-06-24" @default.
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