We report the first observation of the radiative decay of the ψ(1S) into a charmonium state. The significance of the observed signal of ψ(1S)→γχc1 is 6.3 standard deviations including systematics. The branching fraction is calculated to be B[ψ(1S)→γχc1]=[4.7-1.8+2.4(stat)-0.5+0.4(sys)×10-5]. We also searched for ψ(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 Belle detector at the KEKB asymmetric-energy e+e- collider at a center-of-mass energy equal to the ψ(2S) mass using ψ(1S) tagging by the ψ(2S)→ψ(1S)π+π- transitions.

Observation of the Radiative Decays of ψ (1S) to χc1 / 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., Cervenkov, D., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 124:12(2020). [10.1103/PhysRevLett.124.122001]

Observation of the Radiative Decays of ψ (1S) to χc1

Campajola M.;Di Capua F.;Merola M.;Pardi S.;Russo Guido;
2020

Abstract

We report the first observation of the radiative decay of the ψ(1S) into a charmonium state. The significance of the observed signal of ψ(1S)→γχc1 is 6.3 standard deviations including systematics. The branching fraction is calculated to be B[ψ(1S)→γχc1]=[4.7-1.8+2.4(stat)-0.5+0.4(sys)×10-5]. We also searched for ψ(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 Belle detector at the KEKB asymmetric-energy e+e- collider at a center-of-mass energy equal to the ψ(2S) mass using ψ(1S) tagging by the ψ(2S)→ψ(1S)π+π- transitions.
2020
Observation of the Radiative Decays of ψ (1S) to χc1 / 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., Cervenkov, D., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 124:12(2020). [10.1103/PhysRevLett.124.122001]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/968987
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