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Measurement of the B0→πℓℓ+νB^0 \to \pi^\ell \ell^+ \nu and B+→η(′)ℓ+νB^+ \to \eta^{(')} \ell^+ \nu Branching Fractions, the B0→π−ℓ+νB^0 \to \pi^- \ell^+ \nu and B+→ηℓ+νB^+ \to \eta \ell^+ \nu Form-Factor Shapes, and Determination of ∣Vub∣|V_{ub}|

Collaboration
Oct, 2010
16 pages
Published in:
  • Phys.Rev.D 83 (2011) 052011
e-Print:
DOI:
Report number:
  • SLAC-PUB-14267,
  • BABAR-PUB-10-025
Experiments:
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20102014201820222025051015
Abstract: (arXiv)
We report the results of a study of the exclusive charmless semileptonic decays, B+→η(′)ℓ+νB^{+} \rightarrow \eta^{(\prime)} \ell^{+} \nu and B0→π−ℓ+νB^{0} \rightarrow \pi^{-} \ell^{+} \nu, undertaken with approximately 464 million \ensuremath{B\kern 0.18em\bar{\kern -0.18em B}} pairs collected at the Υ(4S)\Upsilon(4S) resonance with the {{\slshape B\kern-0.1em{\smaller A}\kern-0.1em B\kern-0.1em{\smaller A\kern-0.2em R}}} 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+νB^{+} \rightarrow \eta \ell^{+} \nu and B0→π−ℓ+νB^{0} \rightarrow \pi^{-} \ell^{+} \nu decays in three and twelve bins of q2q^2, respectively, from which we extract the f+(q2)f_+(q^2) form-factor shapes and the total branching fractions {\ensuremath{\cal B}}(B^{+} \rightarrow \eta \ell^{+} \nu) =(0.36±0.05stat±0.04syst)×10−4 = (0.36 \pm 0.05_{stat} \pm 0.04_{syst}) \times 10^{-4} and {\ensuremath{\cal B}}(B^{0} \rightarrow \pi^- \ell^{+} \nu) =(1.42±0.05stat±0.07syst)×10−4 = (1.42 \pm 0.05_{stat} \pm 0.07_{syst}) \times 10^{-4}. We also measure {\ensuremath{\cal B}}(B^{+} \rightarrow \eta^{\prime} \ell^{+} \nu) =(0.24±0.08stat±0.03syst)×10−4 = (0.24 \pm 0.08_{stat} \pm 0.03_{syst}) \times 10^{-4}. We obtain values for the magnitude of the CKM matrix element \ensuremath{|V_{ub}|} using three different QCD calculations.
Note:
  • 18 pages,9 figures, 12 tables. Published in Phys. Rev. D
  • 13.20.He
  • 12.38.Qk
  • 14.40.Nd
  • 12.15.Hh
  • electron positron: annihilation
  • B: pair production
  • B: semileptonic decay
  • final state: (0charm)
  • B+: branching ratio: measured
  • B0: branching ratio: measured
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