The D to K and D to pi semileptonic decay form factors from Lattice QCD

Koponen, J., Davies, C. , Donald, G., Follana, E., Lepage, G. P., Na, H. and Shigemitsu, J. (2011) The D to K and D to pi semileptonic decay form factors from Lattice QCD. In: XXIX International Symposium on Lattice Field Theory - Lattice 2011, Squaw Valley, Lake Tahoe, CA, USA, 10-16 July 2011,

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Abstract

We present a new and very high statistics study of D and D<sub>s</sub> semileptonic decay form factors on the lattice. We work with MILC N<sub>f</sub> = 2+1 lattices and use the Highly Improved Staggered Action (HISQ) for both the charm and the light valence quarks. We use both scalar and vector currents to determine the form factors f<sub>0</sub>(q<sup>2</sup>) and f+(q<sup>2</sup>) for a range of D and Ds form factors including those for D to p and D to K semileptonic decays. By using a phased boundary condition we are able to tune accurately to q<sup>2</sup> = 0. We also compare the shape in q<sup>2</sup> to that from experiment. We show that the form factors are very insensitive to the spectator quark: D to K and D<sub>s</sub> to h<sub>s</sub> form factors are essentially the same, and the same is true for D to p and D<sub>s</sub> to K. This has important implications when considering the corresponding B/B<sub>s</sub> processes.

Item Type:Conference Proceedings
Status:Published
Refereed:No
Glasgow Author(s) Enlighten ID:Follana, Dr Eduardo and Koponen, Dr Jonna and Shigemitsu, Prof Junko and Davies, Professor Christine and Donald, Dr Gordon
Authors: Koponen, J., Davies, C., Donald, G., Follana, E., Lepage, G. P., Na, H., and Shigemitsu, J.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Copyright Holders:Copyright © 2011 The Authors
Publisher Policy:Reproduced under a Creative Commons License
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