Lattice results for D/Ds leptonic and semileptonic decays

Koponen, J. (2013) Lattice results for D/Ds leptonic and semileptonic decays. In: 6th International Workshop on Charm Physics (Charm 2013), Manchester, UK, 31 Aug - 4 Sep 2013,

Abstract

This review article summarizes recent lattice QCD results for D and D_s meson leptonic and semileptonic decays. Knowing the meson decay constants and semileptonic form factors from theory, one can extract CKM elements V_cd and V_cs from experimental results. At present, the most accurate results for decay constants are from the Fermilab Lattice and MILC Collaborations: f_D=212.5±0.5_{stat}+0.6−1.5|_{syst} MeV and fDs=248.9±0.2_{stat}+0.5−1.6|_{syst} MeV, giving V_cd=0.2184±0.009_{expt}+0.0008−0.0016|_{lattice} and V_cs=1.017±0.02_{expt}+0.002−0.007|_{lattice}. The shapes of the semileptonic form factors from lattice QCD agree very well with experiment, and the accuracy is currently at the 2-5% level for D→πℓν and 1-2% for D→Kℓν. Extracting the CKM elements from the semileptonic decays yields V_cd=0.225(6)_{expt}(10)_{lattice} (HPQCD Collaboration) and V_cs=0.963(5)_{expt}(14)_{lattice} (HPQCD Collaboration). These lattice calculations also revealed that the semileptonic form factors are insensitive to whether the spectator quark is a light or strange quark.

• Item Type: Conference Proceedings
• Status: Published
• Refereed: No
• Glasgow Author(s) Enlighten ID: Koponen, Dr Jonna
• Authors: Koponen, J.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Copyright Holders: Copyright © 2013 The Author
• Publisher Policy: Reproduced with the permission of the publisher

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