Study of B, Bs mesons using heavy quark effective theory

TL;DR

This paper calculates the masses and strong decay properties of excited B and Bs mesons using heavy quark effective theory, providing predictions consistent with existing data and proposing ratios for future experimental verification.

Contribution

It introduces a comprehensive calculation of bottom meson masses and decay rates within HQET, utilizing flavor-independent parameters and extending charm sector couplings to bottom mesons.

Findings

Predicted masses of unknown bottom mesons align with experimental data.

Calculated decay widths and ratios for excited bottom mesons.

Provided theoretical predictions for future experimental tests.

Abstract

Inspired by the lower statistical information in the bottom {\bf sector, in this paper, we} calculate the masses and the strong decays of excited $B$ and $B_s$ mesons in the framework of heavy quark effective theory (HQET). Using an effective chiral Lagrangian approach based on heavy quark spin-flavor and light quark chiral symmetry, we explore the flavor independent parameters $\Delta_F^{(c)} = \Delta_F^{(b)}$ and $\lambda_F^{(c)} = \lambda_F^{(b)}$ to calculate the masses of experimentally unknown bottom mesons. Our predictions are consistent with the available experimental results and other theoretical studies. Their strong decay to the ground state bottom mesons plus light pseudoscalar mesons is calculated in terms of the square of the couplings $g_H$, $g_S$, $g_T$, $g_X$, $g_Y$, and $g_R$. The weighted average value of the couplings $g_H$, $g_S$ and $g_T$ {\bf is} obtained in the charm sector [Phys. Rev. D \textbf{86}, 054024 (2012)] by fitting the calculated decay widths with experimental measurements, which will be used in the present study to analyze the strong decays of excited open bottom mesons. Moreover, the ratio of the decay rates is also predicted, which can be countered with future experimental data.