Measurement of the decay B0π+νB^0\to\pi^-\ell^+\nu and determination of Vub|V_{ub}|

Collaboration
Dec, 2010

Citations per year

20102014201820222025051015
Abstract: (arXiv)
We present a measurement of the charmless semileptonic decay B0π+νB^0\to\pi^-\ell^+\nu using a data sample containing 657×106\times 10^6 BBˉB\bar{B} events collected with the Belle detector at the KEKB asymmetric-energy e+ee^+e^- collider operating near the Υ(4S)\Upsilon(4S) resonance. We determine the total branching fraction of the decay, B(B0π+ν)=(1.49±0.04(stat)±0.07(syst))×104\mathcal{B}(B^0\to\pi^-\ell^+\nu)=(1.49\pm 0.04{(\mathrm{stat})}\pm 0.07{(\mathrm{syst})})\times 10^{-4}. We also report a new precise measurement of the differential decay rate, and extract the Cabibbo-Kobayashi-Maskawa matrix element Vub|V_{ub}| using model-independent and -dependent approaches. From a simultaneous fit to the measured differential decay rate and lattice QCD results, we obtain Vub=(3.43±0.33)×103|V_{ub}|=(3.43\pm 0.33)\times 10^{-3}, where the error includes both statistical and systematic uncertainties.
Note:
  • 8 pages, 3 figures, Submitted to PRD(RC)
  • 12.15.Hh
  • 12.38.Qk
  • 13.20.He
  • B0: decay rate
  • B0: semileptonic decay
  • lattice field theory
  • Upsilon(10570)
  • CKM matrix
  • BELLE
  • KEK-B