B→πℓv and B→;ℓ+;ℓ- Semilept

Daping Du, Jon A. Bailey, A. Bazavov, C. Bernard, A. X. El-Khadra, Steven Gottlieb, R. D. Jain, A. S. Kronfeld, John W Laiho, Yuzhi Liu, P. B. Mackenzie, Y. Meurice, R. S. Van De Water, Ran Zhou

Research output: Contribution to journalArticlepeer-review


We update the lattice calculation of the B→π semileptonic form factors, which have important applications to the CKM matrix element jVubj and the B →π ℓ+- rare decay. We use MILC asqtad ensembles with Nf = 2+1 sea quarks and over a range of lattice spacings a ≈ 0:045- 0:12 fm. We perform a combined chiral and continuum extrapolation of our lattice data using SU(2) staggered chiral perturbation theory in the hard pion limit. To extend the results for the form factors to the full kinematic range, we take a functional approach to parameterize the form factors using the Bourrely-Caprini-Lellouch formalism in a model-independent way. Our analysis is still blinded with an unknown off-set factor which will be disclosed when we present the final results.

Original languageEnglish (US)
Article number383
JournalUnknown Journal
StatePublished - 2013
Externally publishedYes

ASJC Scopus subject areas

  • General

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