Journal Article

Strong decays of the lowest bottomonium hybrid within an extended Born–Oppenheimer framework

González, P, Bruschini, R

2021

Overview

We analyze the decays of the theoretically predicted lowest bottomonium hybrid H(1P) to open bottom two-meson states. We do it by embedding a quark pair creation model into the Born–Oppenheimer framework which allows for a unified, QCD-motivated description of bottomonium hybrids as well as bottomonium. A new 1P1 decay model for H(1P) comes out. The same analysis applied to bottomonium leads naturally to the well-known 3P0 decay model. We show that H(1P) and the theoretically predicted bottomonium state Υ(5S), whose calculated masses are close to each other, have very different widths for such decays. A comparison with data from Υ(10860), an experimental resonance whose mass is similar to that of Υ(5S) and H(1P), is carried out. Neither a Υ(5S) nor a H(1P) assignment can explain the measured decay widths. However, a Υ(5S)–H(1P) mixing may give account of them supporting previous analyses of dipion decays of Υ(10860) and suggesting a possible experimental evidence of H(1P).

• Publisher: Springer Nature B.V
• Subject: Decay