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# Kaon semileptonic decays near the physical point

Boyle, Peter A., Flynn, Jonathan M., Sivalingam, Karthee, Jüttner, Andreas, Sachrajda, Christopher and Zanotti, James M. (2012) Kaon semileptonic decays near the physical point. Pre-print, 1-7.

Record type: Article

## Abstract

The CKM matrix element $|V_{us}|$ can be extracted from the experimental measurement of semileptonic $K\to\pi$ decays. The determination depends on theory input for the corresponding vector form factor in QCD. We present a preliminary update on our efforts to compute it in $N_f=2+1$ lattice QCD using domain wall fermions for several lattice spacings and with a lightest pion mass of about $170\,\mathrm{MeV}$. By using partially twisted boundary conditions we avoid systematic errors associated with an interpolation of the form factor in momentum-transfer, while simulated pion masses near the physical point reduce the systematic error due to the chiral extrapolation

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__userfiles.soton.ac.uk_Users_nl2_mydesktop_Slabakova_Chemistry_articles_1212 3188.pdf - Author's Original

e-pub ahead of print date: 13 December 2012
Organisations: Theoretical Partical Physics Group

## Identifiers

Local EPrints ID: 350972
URI: http://eprints.soton.ac.uk/id/eprint/350972
PURE UUID: 9af7ea16-912a-4e7b-93c8-ca344972c4c5

## Catalogue record

Date deposited: 12 Apr 2013 07:53

## Contributors

Author: Peter A. Boyle
Author: Jonathan M. Flynn
Author: Karthee Sivalingam
Author: Andreas Jüttner
Author: James M. Zanotti