Calculation of $$K\to\pi l\nu$$ Form Factors with $$N_f = 2+1$$ Flavors of Staggered Auarks
We report on the status of the Fermilab-MILC calculation of the form factor f{sub +}{sup K}{pi}(q{sup 2} = 0), needed to extract the CKM matrix element |V{sub us}| 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 N{sub f} = 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 {approx} 0.12 fm and a {approx} 0.09 fm, and several choices of the light quark masses.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1029657
- Report Number(s):
- FERMILAB-CONF-11-612-T; arXiv eprint number arXiv:1111.2021; TRN: US1105832
- Resource Relation:
- Conference: Presented at The XXIX International Symposium on Lattice Field Theory - Lattice 2011, July 10-16, 2011, Squaw Valley, Lake Tahoe, California
- Country of Publication:
- United States
- Language:
- English
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