Search for W_bjusing Υ(5S) → γ W_bj Decay

The search for molecular states denoted as W_bj is motivated by the recent discovery of the Z_b(10610) and Z_b(10650) at Belle. These exotic hadrons are observed in transitions from the Υ(5S) and Υ(6S) to bottomonium states via single-pion emission, and their existence suggests the possibility of a new family of hadronic resonances. We describe a search for W_bj in the radiative decay Υ(5S) → γ W_bj using 121.4 fb^-1 of data collected at the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy electron-positron collider. Using Monte Carlo simulation and blinded data, we study Belle's sensitivity to the decay Υ(5S) → γ W_bj and search for its presence in Belle data.