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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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