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Koponen, Jonna; Davies, Christine; Donald, Gordon; Follana, Eduardo; Lepage, G. Peter; Na, Heechang; Shigemitsu, Junko (2011)
Languages: English
Types: Other
Subjects: QC
We present a new and very high statistics study of D and Ds semileptonic decay form factors on the lattice. We work with MILC Nf = 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 f0(q2) and f+(q2) 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 q2 = 0. We also compare the shape in q2 to that from experiment.\ud We show that the form factors are very insensitive to the spectator quark: D to K and Ds to hs form factors are essentially the same, and the same is true for D to p and Ds to K. This has important implications when considering the corresponding B/Bs processes.
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    • 1.5 [1] The HPQCD Collaboration, G. Donald, C.T.H. Davies, and J. Koponen, PoS(Lattice 2011)278 [2] C. McNeile, C.T.H. Davies, E. Follana, K. Hornbostel, and G.P. Lepage, Phys.Rev.D82:034512,2010 [3] The HPQCD Collaboration, H. Na, C.T.H. Davies, E. Follana, G.P. Lepage, and J. Shigemitsu, Phys.Rev.D82:114506,2010 and PoS(Lattice 2010)315; The HPQCD Collaboration, arXiv:1109.1501 [4] The CLEO Collaboration: D. Besson, et al, Phys.Rev.D80:032005,2009 [5] P. Blasi, P. Colangelo, G. Nardulli, and N. Paver, Phys.Rev.D49:238,1994
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