Vcs from Ds→ϕℓν semileptonic decay and full lattice QCD

Donald, G.C., Davies, C.T.H. , Koponen, J. and Lepage, G.P. (2014) Vcs from Ds→ϕℓν semileptonic decay and full lattice QCD. Physical Review D, 90, 074506. (doi: 10.1103/PhysRevD.90.074506)

Abstract

We determine the complete set of axial and vector form factors for the Ds→ϕℓν decay from full lattice QCD for the first time. The valence quarks are implemented using the highly improved staggered quark action and we normalize the appropriate axial and vector currents fully nonperturbatively. The q2 and angular distributions we obtain for the differential rate agree well with those from the BABAR experiment and, from the total branching fraction, we obtain Vcs=1.017(63), in good agreement with that from D→Kℓν semileptonic decay. We also find the mass and decay constant of the ϕ meson in good agreement with experiment, showing that its decay to KK¯ (which we do not include here) has at most a small effect. We include an Appendix on nonperturbative renormalization of the complete set of staggered vector and axial vector bilinears needed for this calculation.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Davies, Professor Christine and Donald, Dr Gordon and Koponen, Dr Jonna
• Authors: Donald, G.C., Davies, C.T.H., Koponen, J., and Lepage, G.P.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review D
• Publisher: American Physical Society
• ISSN: 1550-7998
• ISSN (Online): 1550-2368