B meson spectroscopy

TL;DR

This paper explores the spectroscopy of B mesons by considering both traditional quark-antiquark states and four-quark components, predicting narrow states and analyzing electromagnetic decay widths.

Contribution

It introduces a mixed model of B meson states combining quark-antiquark and four-quark components, extending previous models used for charm mesons.

Findings

Four-quark components lower certain B_sJ state masses.

Some B_sJ states are predicted to be narrow due to mass shifts.

Electromagnetic decay widths are quantitatively analyzed.

Abstract

We study the $B$ meson spectroscopy allowing the mixture of conventional $P$ wave quark-antiquark states and four-quark components. A similar picture was used to describe the new $D_J$ and $D_{sJ}$ open charm mesons. The four-quark components shift the masses of some positive parity $B_{sJ}$ states below their corresponding isospin preserving two-meson threshold and therefore they are expected to be narrow. Electromagnetic decay widths are analyzed.