Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
1995-03-02
Nucl.Phys. B439 (1995) 91-130
Physics
High Energy Physics
High Energy Physics - Lattice
Latex, 43 pages, 5 figures available by fax upon request. To be published in Nucl. Phys B
Scientific paper
10.1016/0550-3213(95)00013-I
The slope of the Isgur-Wise function at the normalization point, $\xi^{(1)}(1)$,is one of the basic parameters for the extraction of the $CKM$ matrix element $V_{cb}$ from exclusive semileptonic decay data. A method for measuring this parameter on the lattice is the effective theory for heavy quarks at small velocity $v$. This theory is a variant of the heavy quark effective theory in which the motion of the quark is treated as a perturbation. In this work we study the lattice renormalization of the slow heavy quark effective theory. We show that the renormalization of $\xi^{(1)}(1)$ is not affected by ultraviolet power divergences, implying no need of difficult non-perturbative subtractions. A lattice computation of $\xi^{(1)}(1)$ with this method is therefore feasible in principle. The one-loop renormalization constants of the effective theory for slow heavy quarks are computed to order $v^2$ together with the lattice-continuum renormalization constant of $\xi^{(1)}(1)$ . We demonstrate that the expansion in the heavy-quark velocity reproduces correctly the infrared structure of the original (non-expanded) theory to every order. We compute also the one-loop renormalization constants of the slow heavy quark effective theory to higher orders in $v^2$ and the lattice-continuum renormalization constants of the higher derivatives of the $\xi$ function. Unfortunately, the renormalization constants of the higher derivatives are affected by ultraviolet power divergences, implying the necessity of numerical non-perturbative subtractions. The lattice computation of higher derivatives of the Isgur-Wise function seems therefore problematic.
Aglietti Ugo
Gimenez Vicent
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