Abstract
We investigate the production of X_b in the process Upsilon (5S,6S)rightarrow gamma X_b, where X_b is assumed to be a B {bar{B}}^* molecular state. Two kinds of meson loops of B^{(*)}{bar{B}}^{(*)} and B_1^{prime }{bar{B}}^{(*)} were considered. To explore the rescattering mechanism, we calculated the relevant branching ratios using the effective Lagrangian based on the heavy quark symmetry. The branching ratios for the Upsilon (5S,6S) rightarrow gamma X_b were found to be at the orders of 10^{-7} sim 10^{-6}. Such sizeable branching ratios might be accessible at BelleII, which would provide important clues to the inner structures of the exotic state X_b.
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