B \to D'_0 (D'_1)\ell \bar \nu decays in HQEFT

TL;DR

This paper analyzes semileptonic B decays into excited charmed mesons using HQEFT, calculating wave functions and Isgur-Wise functions with QCD sum rules, and finds that $j_l^P=3/2^+$ states dominate despite $1/m_Q$ corrections.

Contribution

It provides a detailed HQEFT analysis of B to excited D meson decays, including wave functions and decay rates, with QCD sum rule calculations for the first time.

Findings

Branching ratios are suppressed by $1/m_Q$ corrections.

Next order wave functions can be significant.

$j_l^P=3/2^+$ states dominate over $1/2^+$ doublets.

Abstract

Semileptonic B decays into excited charmed mesons $D'_0$ and $D'_1$ are studied in the framework of heavy quark effective field theory (HQEFT) up to order $1/m_Q$. They are characterized by a single leading Isgur-Wise function $\tau$ and several wave functions arising at $1/m_Q$ order. $\tau$ and the $1/m_Q$ order functions $\chi^b_0$, $\chi^c_0$ related to the kinetic energy operators are evaluated through QCD sum rule approach; zero recoil values of the $1/m_Q$ order functions $\kappa_1$, $\kappa_2$, $\kappa'_1$ and $\kappa'_2$ are extracted from the meson masses; and the branching ratios are found to be suppressed by the $1/m_Q$ corrections. It is concluded that the next leading order wave functions can be significant. However it does not change the previous prediction that the production rate of $j_l^P=3/2^+$ charmed mesons dominates over that of $1/2^+$ doublets.