| Abstract |
content_type = "text/plain"
user_agent = "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)"
moz = "Mozilla/5.0 "
moz_version = "5"
We report the results of a study of the exclusive charmless semileptonic B0->pilnu
decay undertaken with approximately 227 million BBbar pairs collected at
the Upsilon(4S) resonance with the BABAR detector. The analysis uses events in
which the signal B mesons are reconstructed with a novel loose neutrino reconstruction
technique. We obtain partial branching fractions in 12 bins of q2, the l+nu invariant
mass squared, from which we extract the f+(q2) form factor shape and the total
branching fraction: BF(B0->pilnu) = (1.44 +- 0.08(stat) +- 0.10(syst))x 10-4.
Based on a recent theoretical calculation of the form factor, we find
the magnitude of the CKM matrix element |Vub| to be (4.1 +- 0.2(stat) +- 0.2(syst) +0.6-0.4(FF))x 10-3,
where the last uncertainty is due to the normalization of the form factor.
|
