Observation of the Radiative Decays of Upsilon(1S) to chi(c1)
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Date
2020-03-26Source Title
Physical Review LettersPublisher
AMER PHYSICAL SOCAffiliation
School of PhysicsMetadata
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Katrenko, P., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Aushev, T., Badhrees, I., Bahinipati, S., Behera, P., Beleno, C., Bennett, J., Bhardwaj, V., Bhuyan, B., Biswal, J., Bobrov, A., Bonvicini, G., Bracko, M., Campajola, M., Cao, L. ,... Zhukova, V. (2020). Observation of the Radiative Decays of Upsilon(1S) to chi(c1). PHYSICAL REVIEW LETTERS, 124 (12), https://doi.org/10.1103/PhysRevLett.124.122001.Access Status
Open AccessAbstract
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)→γχ_{c1} is 6.3 standard deviations including systematics. The branching fraction is calculated to be B[ϒ(1S)→γχ_{c1}]=[4.7_{-1.8}^{+2.4}(stat)_{-0.5}^{+0.4}(sys)×10^{-5}]. We also searched for ϒ(1S) radiative decays into χ_{c0,2} and η_{c}(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 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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