Dynamical lattice computation of the Isgur-Wise functions tau_{1/2} and tau_{3/2}

Details Dynamical lattice computation of the Isgur-Wise functions tau_{1/2} and tau_{3/2} Dynamical lattice computation of the Isgur-Wise functions tau_{1/2} and tau_{3/2}

2009-09-04

arxiv.org/abs/0909.0858v1

PoS LAT2009:253,2009

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 2 figures, talk given at the XXVII International Symposium on Lattice Field Theory, July 26 - 31 2009, Peking Univers

Scientific paper

We perform a two-flavor dynamical lattice computation of the Isgur-Wise functions tau_{1/2} and tau_{3/2} at zero recoil in the static limit. We find tau_{1/2}(1) = 0.297(26) and tau_{3/2}(1) = 0.528(23) fulfilling Uraltsev's sum rule by around 80%. We also comment on a persistent conflict between theory and experiment regarding semileptonic decays of B mesons into orbitally excited P wave D mesons, the so-called "1/2 versus 3/2 puzzle", and we discuss the relevance of lattice results in this context.

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