Charm semileptonic decays and |Vcs(d)| from heavy clover quarks and 2+1 flavor asqtad staggered ensembles
- Seoul Natl. U., Dept. Phys. Astron.
- Illinois U., Urbana
- Indiana U.
- Fermilab
By combining experimentally measured partial branching fractions for the semileptonic decays D to K l nu and D to pi l nu with lattice calculations of the form factors f_+^{D to K}(q^2) and f_+^{D to pi}(q^2), one can extract the CKM matrix elements |V_{cs}| and |V_{cd}|. We are calculating the form factors by using Fermilab charm and asqtad staggered light and strange quarks on 2+1 flavor asqtad staggered ensembles generated by the MILC Collaboration. We vary the light valence quark masses from 0.4m_s to 0.05m_s (m_s is the strange sea-quark mass), and the lattice spacings, from about 0.12 fm to about 0.045 fm. We extrapolate to the physical light-quark mass and the continuum limit using heavy-light meson staggered chiral perturbation theory about the SU(2) and SU(3) limits, compare the resulting (preliminary) form factor shapes with experiment, and discuss our errors.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- Fermilab Lattice; MILC
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1406473
- Report Number(s):
- arXiv:1211.4964; FERMILAB-CONF-12-610-T; 1203461
- Journal Information:
- PoS, Vol. LATTICE2012; Conference: 30th International Symposium on Lattice Field Theory, Cairns, Australia, 06/24-06/29/2012
- Country of Publication:
- United States
- Language:
- English
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