July 31, 2017 to August 4, 2017
Fermi National Accelerator Laboratory
US/Central timezone

Alternative Formulation of the z-Expansion in Semileptonic Decays

Aug 1, 2017, 11:21 AM
Racetrack (Fermi National Accelerator Laboratory)


Fermi National Accelerator Laboratory

Presentation QCD QCD


Mr Erik Gustafson (University of Iowa)


We propose an alternative method to perform the z expansion in the B→π l ν decay by using a rational expression that automatically satisfies the constraint imposed by the conservation of angular momentum. This avoids having to impose a constraint on the truncated series. The accuracy of the formulation was checked by fitting the lattice data in conjunction with the experimental data from Belle and BaBar. We discuss the accuracy of extrapolations based on fits of subregions of the kinematic range.

Primary authors

Mr Erik Gustafson (University of Iowa) Yannick Meurice (U. of Iowa) Mr Zechariah Gelzer (University of Iowa)

Presentation materials