We report the results of a study of the exclusive charmless semileptonic decays, B+→η(′)ℓ+ν and B0→π−ℓ+ν, undertaken with approximately 464×106 BB⎯⎯⎯ pairs collected at the Υ(4S) resonance with the BABAR detector. The analysis uses events in which the signal B decays are reconstructed with a loose neutrino reconstruction technique. We obtain partial branching fractions for B+→ηℓ+ν and B0→π−ℓ+ν decays in three and 12 bins of q2, respectively, from which we extract the f+(q2) form-factor shapes and the total branching fractions ℬ(B+→ηℓ+ν)=(0.36±0.05stat±0.04syst)×10−4 and ℬ(B0→π−ℓ+ν)=(1.42±0.05stat±0.07syst)×10−4. We also measure ℬ(B+→η′ℓ+ν)=(0.24±0.08stat±0.03syst)×10−4. We obtain values for the magnitude of the CKM matrix element |Vub| using three different QCD calculations.

Sanchez, P.d.A., Lees, J.P., Poireau, V., Prencipe, E., Tisserand, V., Garra Tico, J., et al. (2011). Measurement of the B(0) -> pi(-)l(+)nu and B(+) -> eta(l)l(+)nu branching fractions, the B(0) -> pi(-)l(+)nu and B(+) -> eta l(+)nu form- factor shapes, and determination of vertical bar V(ub)vertical bar. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 83(5), 1-16 [10.1103/PhysRevD.83.052011].

Measurement of the B(0) -> pi(-)l(+)nu and B(+) -> eta(l)l(+)nu branching fractions, the B(0) -> pi(-)l(+)nu and B(+) -> eta l(+)nu form- factor shapes, and determination of vertical bar V(ub)vertical bar

PATRIGNANI, CLAUDIA;
2011

Abstract

We report the results of a study of the exclusive charmless semileptonic decays, B+→η(′)ℓ+ν and B0→π−ℓ+ν, undertaken with approximately 464×106 BB⎯⎯⎯ pairs collected at the Υ(4S) resonance with the BABAR detector. The analysis uses events in which the signal B decays are reconstructed with a loose neutrino reconstruction technique. We obtain partial branching fractions for B+→ηℓ+ν and B0→π−ℓ+ν decays in three and 12 bins of q2, respectively, from which we extract the f+(q2) form-factor shapes and the total branching fractions ℬ(B+→ηℓ+ν)=(0.36±0.05stat±0.04syst)×10−4 and ℬ(B0→π−ℓ+ν)=(1.42±0.05stat±0.07syst)×10−4. We also measure ℬ(B+→η′ℓ+ν)=(0.24±0.08stat±0.03syst)×10−4. We obtain values for the magnitude of the CKM matrix element |Vub| using three different QCD calculations.
2011
Sanchez, P.d.A., Lees, J.P., Poireau, V., Prencipe, E., Tisserand, V., Garra Tico, J., et al. (2011). Measurement of the B(0) -> pi(-)l(+)nu and B(+) -> eta(l)l(+)nu branching fractions, the B(0) -> pi(-)l(+)nu and B(+) -> eta l(+)nu form- factor shapes, and determination of vertical bar V(ub)vertical bar. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 83(5), 1-16 [10.1103/PhysRevD.83.052011].
Sanchez, P. del Amo; Lees, J. P.; Poireau, V.; Prencipe, E.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Martinelli, M.; Milanes, D. A.; Palano, A.; P...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/543514
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