# Measurement of the Ratio ${\cal B}\xspace(\B^+ \to X e \nu)$ / ${\cal B}\xspace(\B^0 \to X e \nu)$

Abstract : We report measurements of the inclusive electron momentum spectra in decays of charged and neutral B mesons, and of the ratio of semileptonic branching fractions ${\cal B}\xspace(\B^+ \to X e \nu)$ and ${\cal B}\xspace(\B^0 \to X e \nu)$. These were performed on a sample of 231 million $B\kern 0.18em\bar{\kern -0.18em B}{}\xspace$ events recorded with the \mbox{\slshape B\kern-0.1em{\smaller A}\kern-0.1em B\kern-0.1em{\smaller A\kern-0.2em R}} detector at the $\Upsilon{(4S)}\xspace$ resonance. Events are selected by fully reconstructing a hadronic decay of one $B$ meson and identifying an electron among the decay products of the recoiling $\Bbar$ meson. We obtain ${\cal B}\xspace(\Bu \to X e \nu)$/${\cal B}\xspace(\Bz \to X e \nu)$ = $1.084 \pm 0.041_{\mathrm{(stat)}}\xspace\pm 0.025_{\mathrm{(syst)}}\xspace$.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00113815
Contributor : Claudine Bombar <>
Submitted on : Tuesday, November 14, 2006 - 3:17:40 PM
Last modification on : Friday, July 24, 2020 - 3:18:54 AM

### Citation

B. Aubert, M. Bona, D. Boutigny, F. Couderc, Y. Karyotakis, et al.. Measurement of the Ratio ${\cal B}\xspace(\B^+ \to X e \nu)$ / ${\cal B}\xspace(\B^0 \to X e \nu)$. Physical Review D, American Physical Society, 2006, 74, 091105 (8 p.). ⟨10.1103/PhysRevD.74.091105⟩. ⟨in2p3-00113815⟩

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