TY - JOUR
T1 - Calculation of K → πlν form factors with Nf = 2+1 flavours of staggered quarks
AU - Fermilab Lattice and MILC Collaborations
AU - Gámiz, E.
AU - DeTar, C.
AU - El-Khadra, A. X.
AU - Kronfeld, A. S.
AU - Mackenzie, P. B.
AU - Simone, J.
N1 - Funding Information:
Computations for this work were carried out with resources provided by the USQCD Collaboration, the Argonne Leadership Computing Facility, the National Energy Research Scientific Computing Center, and the Los Alamos National Laboratory, which are funded by the Office of Science of the U.S. Department of Energy; and with resources provided by the National Institute for Computational Science, the Pittsburgh Supercomputer Center, the San Diego Supercomputer Center, and the Texas Advanced Computing Center, which are funded through the National Science Foundation’s Teragrid/XSEDE Program. This work was supported in part by the MICINN (Spain) under grant FPA2010-16696 and Ramón y Cajal program (E.G.), Junta de Andalucía (Spain) under grants FQM-101, FQM-330, FQM-03048, and FQM-6552 (E.G.), and by the U.S. Department of Energy under Grant No. DE-FG02-91ER40677 (A.X.E.).
Publisher Copyright:
© Copyright owned by the author(s).
PY - 2011
Y1 - 2011
N2 - We report on the status of the Fermilab-MILC calculation of the form factor f+ Kπ (q2 = 0), needed to extract the CKM matrix element |Vus| from experimental data on K semileptonic decays. The HISQ formulation is used in the simulations for the valence quarks, while the sea quarks are simulated with the asqtad action (MILC Nf = 2 + 1 configurations). We discuss the general methodology of the calculation, including the use of twisted boundary conditions to get values of the momentum transfer close to zero and the different techniques applied for the correlators fits. We present initial results for lattice spacings a ≈ 0.12 fm and a ≈ 0.09 fm, and several choices of the light quark masses.
AB - We report on the status of the Fermilab-MILC calculation of the form factor f+ Kπ (q2 = 0), needed to extract the CKM matrix element |Vus| from experimental data on K semileptonic decays. The HISQ formulation is used in the simulations for the valence quarks, while the sea quarks are simulated with the asqtad action (MILC Nf = 2 + 1 configurations). We discuss the general methodology of the calculation, including the use of twisted boundary conditions to get values of the momentum transfer close to zero and the different techniques applied for the correlators fits. We present initial results for lattice spacings a ≈ 0.12 fm and a ≈ 0.09 fm, and several choices of the light quark masses.
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M3 - Conference article
AN - SCOPUS:85053334945
SN - 1824-8039
VL - 139
JO - Proceedings of Science
JF - Proceedings of Science
T2 - 29th International Symposium on Lattice Field Theory, Lattice 2011
Y2 - 10 July 2011 through 16 July 2011
ER -