We report the measurement of the two-photon decay width of χc2(1P) in two-photon processes at the Belle experiment. We analyze the process γγ → χc2(1P) → J/ψγ, J/ψ → ℓ+ℓ− (ℓ = e or μ) using a data sample of 971 fb−1 collected with the Belle detector at the KEKB e+e− collider. In this analysis, the product of the two-photon decay width of χc2(1P) and the branching fraction is determined to be Γγγ(χc2(1P))B(χc2(1P)→J/ψγ)B(J/ψ→ℓ+ℓ−)=14.8±0.3(stat.)±0.7(syst.) eV, which corresponds to Γγγ(χc2(1P)) = 653 ± 13(stat.) ± 31(syst.) ± 17(B.R.) eV, where the third uncertainty is from B(χc2(1P) → J/ψγ) and B(J/ψ → ℓ+ℓ−). [Figure not available: see fulltext.].

Measurement of two-photon decay width of χc2(1P) in γγ → χc2(1P) → J/ψγ at Belle / Seino, Y., Hayasaka, K., Uehara, S., Adachi, I., Aihara, H., Al Said, S., Asner, D.M., Atmacan, H., Aushev, T., Ayad, R., Babu, V., Bahinipati, S., Behera, P., Belous, K., Bennett, J., Bessner, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Bodrov, D., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2023:1(2023). [10.1007/JHEP01(2023)160]

Measurement of two-photon decay width of χc2(1P) in γγ → χc2(1P) → J/ψγ at Belle

Campajola M.;Di Capua F.;Merola M.;Pardi S.;Russo Guido;
2023

Abstract

We report the measurement of the two-photon decay width of χc2(1P) in two-photon processes at the Belle experiment. We analyze the process γγ → χc2(1P) → J/ψγ, J/ψ → ℓ+ℓ− (ℓ = e or μ) using a data sample of 971 fb−1 collected with the Belle detector at the KEKB e+e− collider. In this analysis, the product of the two-photon decay width of χc2(1P) and the branching fraction is determined to be Γγγ(χc2(1P))B(χc2(1P)→J/ψγ)B(J/ψ→ℓ+ℓ−)=14.8±0.3(stat.)±0.7(syst.) eV, which corresponds to Γγγ(χc2(1P)) = 653 ± 13(stat.) ± 31(syst.) ± 17(B.R.) eV, where the third uncertainty is from B(χc2(1P) → J/ψγ) and B(J/ψ → ℓ+ℓ−). [Figure not available: see fulltext.].
2023
Measurement of two-photon decay width of χc2(1P) in γγ → χc2(1P) → J/ψγ at Belle / Seino, Y., Hayasaka, K., Uehara, S., Adachi, I., Aihara, H., Al Said, S., Asner, D.M., Atmacan, H., Aushev, T., Ayad, R., Babu, V., Bahinipati, S., Behera, P., Belous, K., Bennett, J., Bessner, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Bodrov, D., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2023:1(2023). [10.1007/JHEP01(2023)160]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/968982
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