Production of a BB¯ bound state via ϒ(4S) radiative decays

Abstract

Motivated by recent theoretical predictions about the existence of a BB¯ bound state [also denoted as X(10550)], in this work we estimate the production of the S-wave B+B− molecule via ϒ(4S) radiative decays. In particular, we make use of effective Lagrangian approach and the compositeness condition to calculate the X(10550) production rate via ϒ(4S)→γX(10550) decays employing triangle diagrams. Our results show that the partial decay width of this reaction is of the order of 0.5–192 keV for a respective binding energy of 1–100 MeV, corresponding to a branching fraction of 10−5–10−3. These findings suggest that the existence of the X(10550) might be checked via the analysis of the mentioned decay in present and future experiments. Published by the American Physical Society 2024