24-30 July 2016
Highfield Campus, University of Southampton
Europe/London timezone

$B\to\pi$ semileptonic decay form factors with NRQCD/HISQ quarks

29 Jul 2016, 17:30
20m
Building 67 Room 1003 (Highfield Campus, University of Southampton)

Building 67 Room 1003

Highfield Campus, University of Southampton

Highfield Campus, Southampton SO17 1BJ, UK
Talk Weak Decays and Matrix Elements Weak Decays and Matrix Elements

Speaker

Dr Chris Bouchard (William & Mary)

Description

We report on our ongoing calculation of the $B\to\pi$ semileptonic decay form factors using NRQCD/HISQ valence quarks with MILC's $N_f=2+1$ asqtad ensembles.  The use of HISQ light quarks allows simulation at large pion momenta, corresponding to $q^2\approx 0$, with controlled $(ap)^2$ errors.  We perform a simultaneous chiral, continuum, and kinematic extrapolation using the Hard Pion ChPT modified $z$ expansion developed in Phys. Rev. D 90, 054506 (2014).  This approach permits lattice simulation in a kinematic region previously considered inaccessible to lattice QCD and promises significant reduction in form factor uncertainties at low $q^2$.

Primary author

Dr Chris Bouchard (William & Mary)

Co-authors

Dr Chris Monahan (Rutgers) Prof. G. Peter Lepage (Cornell) Prof. Junko Shigemitsu (Ohio State)

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