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Volume 334 - The 36th Annual International Symposium on Lattice Field Theory (LATTICE2018) - Weak Decays and Matrix Elements
Update on $B \to D^\ast \ell \nu$ form factor at zero-recoil using the Oktay-Kronfeld action
T. Bhattacharya, R. Gupta, S. Park,* Y.C. Jang, J. Bailey, B.J. Choi, H. Jeong, S. Jwa, S. Lee, W. Lee, J. Pak, J. Leem on behalf of LANL/SWME Collaboration
*corresponding author
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Published on: 2019 May 29
We present an update on the calculation of $\bar{B}\to D^\ast \ell \bar{\nu}$ semileptonic form factor at zero recoil using the Oktay-Kronfeld bottom and charm quarks on $N_f=2+1+1$ flavor HISQ ensembles generated by the MILC collaboration. Preliminary results are given for two ensembles with $a\approx 0.12$ and $0.09$ fm and $M_\pi\approx 310$ MeV. Calculations have been done with a number of valence quark masses, and the dependence of the form factor on them is investigated on the $a\approx 0.12$ fm ensemble. The excited state is controlled by using multistate fits to the three-point correlators measured at 4--6 source-sink separations.
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