Li, G (reprint author), Qufu Normal Univ, Dept Phys, Qufu 273165, Peoples R China.
In this work, we study the isospin conserved hidden bottomonium decay of X-b -> Upsilon(1S)omega, where X-b is taken to be the counterpart of the famous X(3872) in the bottomonium sector as a candidate for the meson-meson molecule. Since it is likely that the X-b is below the B (B) over bar* threshold and the mass difference between the neutral and charged bottom meson is small compared to the binding energy of the X-b, the isospin violating decay mode Xb -> Upsilon(nS)pi(+)pi(-) would be greatly suppressed. We use the effective Lagrangian based on the heavy quark symmetry to explore the rescattering mechanism of X-b -> Upsilon(1S)omega and calculate the partial widths. Our results show that the partial width for the X-b -> Upsilon(1S)omega is about tens of keVs. Taking into account the fact that the total width of X-b may be smaller than a few MeV like X(3872), the calculated branching ratios may reach to orders of 10(-2). These hidden bottomonium decay modes are of great importance in the experimental search for the X-b particularly at the hadron collider. Also, the associated studies of hidden bottomonium decays X-b -> Upsilon(nS)gamma, Upsilon(nS)omega, and B (B) over bar gamma may help us investigate the structure of X-b deeply. The experimental observation of X-b will provide us with further insight into the spectroscopy of exotic states and is helpful to probe the structure of the states connected by the heavy quark symmetry.