Dec 15 – 16, 2020
Centre for Particle Theory, Durham
Europe/London timezone

Heavy $\to$ strange Semileptonic Decays in Lattice QCD

Dec 16, 2020, 2:30 PM
Teams (Centre for Particle Theory, Durham)


Centre for Particle Theory, Durham

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


William Parrott (University of Glasgow)


$D \to{}K l \nu$ 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.

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Length of talk 15-25 minutes

Primary author

William Parrott (University of Glasgow)

Presentation materials