Lattice measurement of the Isgur-Wise functions tau_1/2 and tau_3/2

Details Lattice measurement of the Isgur-Wise functions tau_1/2 and tau_3/2 Lattice measurement of the Isgur-Wise functions tau_1/2 and tau_3/2

2004-06-18

arxiv.org/abs/hep-lat/0406031v1

Phys.Lett.B609:298-308,2005

Physics

High Energy Physics

High Energy Physics - Lattice

LaTeX, 13 pages, 3 eps figures

Scientific paper

10.1016/j.physletb.2005.01.054

We propose a method to compute the Isgur-Wise form factors tau_1/2(1) and tau_3/2(1) for the decay of B mesons into orbitally excited (P wave) D** charmed mesons on the lattice in the static limit. We also present the result of an exploratory numerical simulation which shows that the signal/noise ratio allows for a more dedicated computation. We find tau_1/2(1)=0.38(5) and tau_3/2(1)= 0.53(8), with yet unknown systematic errors. These preliminary numbers agree fairly well with theoretical expectation.

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