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Phys. Rev. Lett. 94, 011601 (2005) [5 pages]

Semileptonic Decays of D Mesons in Three-Flavor Lattice QCD

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C. Aubin1, C. Bernard1, C. DeTar2, M. DiPierro3, A. El-Khadra4, Steven Gottlieb5, E. B. Gregory6, U. M. Heller7, J. Hetrick8, A. S. Kronfeld9, P. B. Mackenzie9, D. Menscher4, M. Nobes10, M. Okamoto9, M. B. Oktay4, J. Osborn2, J. Simone9, R. Sugar11, D. Toussaint6, and H. D. Trottier10 (Fermilab Lattice Collaboration, MILC Collaboration, and HPQCD Collaboration)
1Department of Physics, Washington University, St. Louis, Missouri 63130, USA
2Physics Department, University of Utah, Salt Lake City, Utah 84112, USA
3School of Computer Science, Telecommunications and Information Systems, DePaul University, Chicago, Illinois 60604, USA
4Physics Department, University of Illinois, Urbana, Illinois 61801-3080, USA
5Department of Physics, Indiana University, Bloomington, Indiana 47405, USA
6Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
7American Physical Society, One Research Road, Box 9000, Ridge, New York 11961-9000, USA
8University of the Pacific, Stockton, California 95211, USA
9Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
10Physics Department, Simon Fraser University, Vancouver, British Columbia, Canada
11Department of Physics, University of California, Santa Barbara, California 93106, USA

Received 28 August 2004; published 5 January 2005

We present the first three-flavor lattice QCD calculations for D→πlν and D→Klν semileptonic decays. Simulations are carried out using ensembles of unquenched gauge fields generated by the MILC Collaboration. With an improved staggered action for light quarks, we are able to simulate at light quark masses down to 1/8 of the strange mass. Consequently, the systematic error from the chiral extrapolation is much smaller than in previous calculations with Wilson-type light quarks. Our results for the form factors at q2=0 are f+D→π(0)=0.64(3)(6) and f+D→K(0)=0.73(3)(7), where the first error is statistical and the second is systematic, added in quadrature. Combining our results with experimental branching ratios, we obtain the Cabibbo-Kobayashi-Maskawa matrix elements |Vcd|=0.239(10)(24)(20) and |Vcs|=0.969(39)(94)(24), where the last errors are from experimental uncertainties.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.011601
DOI:
10.1103/PhysRevLett.94.011601
PACS:
13.20.Fc, 12.38.Gc
 
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