Observation of the radiative decays of Υ(1S) to χc1

Katrenko, P and Adachi, I and Giri, Anjan Kumar and et al, . (2019) Observation of the radiative decays of Υ(1S) to χc1. arXiv.org.

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Abstract

We report the first observation of the radiative decay of the Υ(1S) into a charmonium state. The significance of the observed signal of Υ(1S) → γχc1 is 6.3 standard deviations including systematics. The branching fraction is calculated to be B(Υ(1S) → γχc1) = (4.7 +2.4 −1.8 (stat)+0.4 −0.5 (sys)) · 10−5 . We also searched for Υ(1S) radiative decays into χc0,2 and ηc(1S, 2S), and set upper limits on their branching fractions. These results are obtained from a 24.9 fb−1 data sample collected with the 3 Belle detector at the KEKB asymmetric-energy e +e − collider at a center-of-mass energy equal to the Υ(2S) mass using Υ(1S) tagging by the Υ(2S) → Υ(1S)π +π − transitions.

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