Charm semileptonic decays and|Vcs(d) from heavy clover quarks and 2+1 flavor asqtad staggered ensembles

Jon A. Bailey, D. Du, A. X. El-Khadra, Steven Gottlieb, R. D. Jain, A. S. Kronfeld, R. S. Van De Water, R. Zhou

Research output: Contribution to journalConference articlepeer-review

Abstract

By combining experimentally measured partial branching fractions for the semileptonic decays D→K and D→ with lattice calculations of the formfactors f D→K + (q2) and f D→ + (q2), one can extract the CKM matrix elements |Vcs| and |Vcd|. 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 0.4ms to 0.05ms (ms 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.

Original languageEnglish
Article number232
JournalProceedings of Science
VolumePart F130497
Publication statusPublished - 2012
Event30th International Symposium on Lattice Field Theory, Lattice 2012 - Cairns, Australia
Duration: 2012 Jun 242012 Jun 29

Bibliographical note

Funding Information:
by the Korean government (MEST); this work was supported by grants DE-FG02-91ER40661 (S.G., R.Z.) and DE-FG02-91ER40677 (D.D., R.D.J., A.X.K.) of the U.S. DOE.

Funding Information:
From the SU(2) (SU(3)) fits above, the statistical errors in f+D→pi(0) are 4% (4%), and those in f+D→K(0), 2.3% (3%). Important systematic errors are from heavy-quark lattice artifacts, the error in r1, and the error in the axial coupling gpi. Naively updating the gpi error reduces the projected systematics to 3.4% [14, 15]. A careful estimate of all systematics reflecting the entire data set has yet to be made; the difference between our present SU(2) and SU(3) curves is in some cases comparable to the other errors. Fermilab is operated under contract DE-AC02-07CH11359 with the U.S. DOE; J.A.B. is supported by the Creative Research Initiatives Program (2012-0000241) of the NRF grant funded

All Science Journal Classification (ASJC) codes

  • General

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