# The 35th International Symposium on Lattice Field Theory

18-24 June 2017
Palacio de Congresos
Europe/Madrid timezone
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# Contribution Parallel

Andalucía I
Weak Decays and Matrix Elements

# Semileptonic $B_c$ decays from highly improved staggered quarks and NRQCD

## Speakers

• Dr. Andrew LYTLE

## Content

We report on a calculation of $B_c \to \eta_c l \nu$ and $B_c \to J/\psi l \nu$ semileptonic decays, using both NRQCD effective theory and a highly improved relativistic (HISQ) formalism at multiple lattice spacings down to $a = 0.045$ fm to treat the $b$ quark. In both formalisms we are able to obtain a signal across the full kinematic range, and good quantitative agreement is seen between the two methods. This also provides a good cross check of the NRQCD framework for $b \to c$ transitions (in particular current normalisations) relevant to processes such as $B_{(s)}^{()} \to D_{(s)}^{()}$.

## Preferred track (if multiple tracks have been selected)

Weak Decays and Matrix Elements