Search for Radiative Decays of the ϒ(1S) Resonance

Abstract

A new technique for searching radiative decays of the ϒ(1S) resonance in the charmonium state is discussed. It is based on tagging the ϒ(1S) resonance in hadron transitions ϒ(2S) → ϒ(1S)π⁺π⁻ using the data sample obtained at B factories, i.e., in experiments at e⁺e⁻ colliders for studying B mesons at the center-of-mass energy equal to the mass of the ϒ(2S) resonance. Simulation estimates show that the use of the proposed method in the Belle experiment will make it possible to increase the sensitivity in the study of the radiative decays of the ϒ(1S) resonance in the charmonium states by an order of magnitude.