QCD sum rule analysis of the subleading Isgur-Wise form-factor tau_1(v.v') and tau_2(v.v') for B->D_1 l\bar\nu and B->D_2^* l\bar\nu

TL;DR

This paper calculates the subleading Isgur-Wise form-factors tau_1 and tau_2 for specific B meson decays using QCD sum rules within heavy quark effective theory, providing insights into meson decay dynamics.

Contribution

It introduces a QCD sum rule approach to determine the subleading Isgur-Wise form-factors tau_1 and tau_2 for B to D meson decays, advancing understanding of heavy quark symmetry corrections.

Findings

Calculated tau_1 and tau_2 form-factors for B->D_1 and B->D_2* decays

Provided numerical estimates of the form-factors within the HQET framework

Enhanced understanding of 1/m_Q corrections in meson decay form factors

Abstract

We present a QCD sum rule calculation of the Isgur-Wise form-factor tau_1(v.v') and tau_2(v.v') for the semileptonic decays B->D_1(2420)l\bar\nu and B->D_2^*(2460)l\bar\nu in the framework of heavy quark effective theory. These two universal functions, associated with the matching of the weak currents in QCD onto those in the effective theory, appear at the order 1/m_Q in the heavy quark expansion of meson weak decay form factors.