# The 35th International Symposium on Lattice Field Theory

18-24 June 2017
Palacio de Congresos
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# Contribution Parallel

Andalucía I
Weak Decays and Matrix Elements

# Nonperturbative determination of form factors for semileptonic Bs meson decays

## Speakers

• Dr. Oliver WITZEL

## Content

Semileptonic decays of $B_s$ mesons allow to explore new, independent channels to determine the CKM matrix elements $|V_{ub}|$ and $|V_{cb}|$. In the past such determinations were hampered by the paucity of experimental data. In light of the large number of $B_s$ mesons recorded by the LHCb experiment however such determinations are becoming feasible but require nonperturbative input in the form of semileptonic form factors. Here we report on our lattice calculation based on the set of 2+1 flavor domain-wall Iwasaki gauge field configurations generated by the RBC-UKQCD collaboration using domain-wall light, strange, and charm quarks, and bottom quarks simulated with the relativistic heavy quark action. We present new results for semileptonic form factors for $B_s \to D_s \ell \nu$ and $B_s \to K \ell \nu$ as well as for $B_s \to \phi \ell^+ \ell^-$ and will give an outlook on determining the ratios $R(D_s)$ and $R(D_s^)$ as well as on form factors for $B_s\to K^{() }\ell^+ \ell^-$ decays.

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

Weak Decays and Matrix Elements