Study of \Bpilnu and \Brholnu decays and determination of \Vub at \babar
Conference
·
· PoS ICHEP2010:277,2010
OSTI ID:1004927
The authors report a measurement of the branching fractions for B{sup 0} {yields} {pi}{sup -}{ell}{sup +}{nu} and B{sup 0} {yields} {rho}{sup -}{ell}{sup +}{nu} decays using charged and neutral B decays with isospin constraints. They find {beta}(B{sup 0} {yields} {pi}{sup -}{ell}{sup +}{nu}) = (1.41 {+-} 0.05 {+-} 0.07) x 10{sup -4}, and {beta}(B{sup 0} {yields} {rho}{sup -}{ell}{sup +}{nu}) = (1.75 {+-} 0.15 {+-} 0.27) x 10{sup -4}, where the first error is statistical and the second is systematic. They measure {Delta}{beta}/{Delta}q{sup 2}, with 6 q{sup 2} bins for B{sup 0} {yields} {pi}{sup -}{ell}{sup +}{nu} and 3 q{sup 2} bins for B{sup 0} {yields} {rho}{sup -}{ell}{sup +}{nu}, and compare the distributions in data with theoretical predictions for the form factors. They use these branching fractions and form-factor calculations to determine |V{sub ub}|. Based on a combined fit to the FNAL/MILC lattice QCD calculation and data over the full q{sup 2} range, they find |V{sub ub}| = (2.95 {+-} 0.31) x 10{sup -3}.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515;
- OSTI ID:
- 1004927
- Report Number(s):
- SLAC-PUB-14326; arXiv:1012.0807
- Conference Information:
- Journal Name: PoS ICHEP2010:277,2010
- Country of Publication:
- United States
- Language:
- English
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