The Isgur-Wise Function: A Lattice Determination from Pseudoscalar --> Pseudoscalar Form Factors

TL;DR

This paper uses lattice QCD to compute form factors for heavy-light meson decays, extracting the Isgur-Wise function and validating it against experimental data, advancing understanding of heavy quark symmetry.

Contribution

It provides a lattice QCD determination of the Isgur-Wise function from pseudoscalar decays, aligning theoretical calculations with experimental results.

Findings

Good agreement with CLEO measurements for B --> D* decays

Lattice results support heavy quark symmetry predictions

Form factors consistent with theoretical models

Abstract

Form factors for pseudoscalar --> pseudoscalar decays of heavy-light mesons are found in quenched lattice QCD with heavy-quark masses in the range of approximately 1-2 GeV. The Isgur-Wise function, $\xi(\omega)$, is extracted from these form factors. Results are in good agreement with $\xi(\omega)$ derived from CLEO measurements for B --> D*.