Hopping Parameter Analysis of Leptonic and Semi-Leptonic Heavy-Light Decays

Details Hopping Parameter Analysis of Leptonic and Semi-Leptonic Heavy-Light Decays Hopping Parameter Analysis of Leptonic and Semi-Leptonic Heavy-Light Decays

1993-12-07

arxiv.org/abs/hep-lat/9312032v1

Nucl.Phys.Proc.Suppl. 34 (1994) 468-470

Physics

High Energy Physics

High Energy Physics - Lattice

UKQCD Collaboration, at the Lattice '93 Conference. 3 pages, Edinburgh preprint 93/532

Scientific paper

We study leptonic and semi-leptonic decays of D and B mesons. Use of the Hopping Parameter Expansion (HPE) for two-point functions allows us continuously to vary the pseudoscalar mass from below m_D up towards m_B. We compute the pseudoscalar decay constants f_D and f_B, and observe consistency with the value calculated in the static limit. {}From the measurement of three-point functions we compute the matrix element relevant to the decay \bar B -> D l \bar nu_l and extract the Isgur-Wise function xi(v.v'). The HPE enables us freely to vary the initial state pseudoscalar mass at constant v.v', and we investigate the 1/m_Q corrections to the heavy-quark limit.

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