- Main
Branching fraction and form-factor shape measurements of exclusive charmless semileptonic B decays, and determination of
- Author(s): Lees, JP
- Poireau, V
- Tisserand, V
- Garra Tico, J
- Grauges, E
- Palano, A
- Eigen, G
- Stugu, B
- Brown, DN
- Kerth, LT
- Kolomensky, YG
- Lynch, G
- Koch, H
- Schroeder, T
- Asgeirsson, DJ
- Hearty, C
- Mattison, TS
- McKenna, JA
- So, RY
- Khan, A
- Blinov, VE
- Buzykaev, AR
- Druzhinin, VP
- Golubev, VB
- Kravchenko, EA
- Onuchin, AP
- Serednyakov, SI
- Skovpen, YI
- Solodov, EP
- Todyshev, KY
- Yushkov, AN
- Bondioli, M
- Kirkby, D
- Lankford, AJ
- Mandelkern, M
- Atmacan, H
- Gary, JW
- Liu, F
- Long, O
- Vitug, GM
- Campagnari, C
- Hong, TM
- Kovalskyi, D
- Richman, JD
- West, CA
- Eisner, AM
- Kroseberg, J
- Lockman, WS
- Martinez, AJ
- Schumm, BA
- Seiden, A
- Chao, DS
- Cheng, CH
- Echenard, B
- Flood, KT
- Hitlin, DG
- Ongmongkolkul, P
- Porter, FC
- Rakitin, AY
- Andreassen, R
- Huard, Z
- Meadows, BT
- Sokoloff, MD
- Sun, L
- Bloom, PC
- Ford, WT
- Gaz, A
- Nauenberg, U
- Smith, JG
- Wagner, SR
- Ayad, R
- Toki, WH
- Spaan, B
- Schubert, KR
- Schwierz, R
- Bernard, D
- Verderi, M
- Clark, PJ
- Playfer, S
- Bettoni, D
- Bozzi, C
- Calabrese, R
- Cibinetto, G
- Fioravanti, E
- Garzia, I
- Luppi, E
- Munerato, M
- Piemontese, L
- Santoro, V
- Baldini-Ferroli, R
- Calcaterra, A
- De Sangro, R
- Finocchiaro, G
- Patteri, P
- Peruzzi, IM
- Piccolo, M
- Rama, M
- Zallo, A
- Contri, R
- Guido, E
- et al.
Abstract
We report the results of a study of the exclusive charmless semileptonic decays, B0→π -+ν, B +→π0 +ν, B +→ω +ν, B +→η +ν, and B +→η ′+ν (=e or μ) undertaken with approximately 462×106 BB̄ 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 in several bins of q2, the square of the momentum transferred to the lepton-neutrino pair, for B0→π -+ν, B +→π0 +ν, B +→ω +ν, and B +→η +ν. From these distributions, we extract the form-factor shapes f +(q2) and the total branching fractions B(B0→π -+ν)=(1.45±0.04 stat±0.06 syst)×10 -4 (combined π - and π0 decay channels assuming isospin symmetry), B(B +→ω +ν)=(1.19±0.16 stat±0.09 syst)×10 -4 and B(B +→η +ν)=(0.38±0.05 stat±0.05 syst)×10 -4. We also measure B(B +→η ′+ν)=(0.24±0. 08 stat±0.03 syst)×10 -4. We obtain values for the magnitude of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |V ub| by direct comparison with three different QCD calculations in restricted q2 ranges of B→π +ν decays. From a simultaneous fit to the experimental data over the full q2 range and the FNAL/MILC lattice QCD predictions, we obtain |V ub|=(3.25±0.31)×10 -3, where the error is the combined experimental and theoretical uncertainty. © 2012 American Physical Society.
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