# YTF 20

15-16 December 2020
Centre for Particle Theory, Durham
Europe/London timezone

## Heavy $\to$ strange Semileptonic Decays in Lattice QCD

16 Dec 2020, 14:30
30m
Teams (Centre for Particle Theory, Durham)

### Teams

#### Centre for Particle Theory, Durham

IPPP & Dept. Mathematical Sciences Durham University South Road Durham DH1 3LE

### Speaker

William Parrott (University of Glasgow)

### Description

$D \to{}K l \nu$ and $B \to K l^+l^-$ are important heavy to strange semileptonic decay processes, giving us direct comparison with experiment, and access to CKM matrix elements and potential new physics.
We can calculate form factors for both of these processes in lattice QCD and connect them together by determining heavy to strange form factors for heavy quark masses ranging from $c$ to $b$. We can also explore the connection to form factors with different light quark masses.
Using the HISQ action on $N_f=2+1+1$, we demonstrate how $D\to{}K$ calculations can be extended up towards the $b$ mass and give preliminary $D \to{} K$ and $B \to {}K$ results, in both cases including results for the tensor form factor with an accurately renormalised tensor current.

Length of talk 15-25 minutes No Yes No

### Primary author

William Parrott (University of Glasgow)

### Presentation Materials

 Meeting now(1).mp4 WillParrottYTF2020.pdf