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Kaon semileptonic decays near the physical point

Kaon semileptonic decays near the physical point
Kaon semileptonic decays near the physical point
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
1-7
Boyle, Peter A.
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Flynn, Jonathan M.
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Sivalingam, Karthee
ca23a673-a85a-42ac-9bf6-361c38c68d06
Jüttner, Andreas
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Sachrajda, Christopher
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Zanotti, James M.
0e14235b-011c-40ce-8b64-8941e3ea5139
Boyle, Peter A.
78a2aebf-aea7-4925-b5df-ead4b4da6fb2
Flynn, Jonathan M.
f8e79a6d-6feb-4ff1-bf58-d1700bd0d2ca
Sivalingam, Karthee
ca23a673-a85a-42ac-9bf6-361c38c68d06
Jüttner, Andreas
b0cc781d-45c8-4fad-bc35-31672d9e7620
Sachrajda, Christopher
0ed6568b-f52f-4314-8677-4aeeb925d6f7
Zanotti, James M.
0e14235b-011c-40ce-8b64-8941e3ea5139

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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e-pub ahead of print date: 13 December 2012
Additional Information: Imported from arXiv
Organisations: Theoretical Partical Physics Group

Identifiers

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

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Date deposited: 12 Apr 2013 07:53
Last modified: 19 Jul 2019 21:39

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Contributors

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

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