@article{08649558aeb04695bc5ccb1978d2e9df,
title = "Measurement of two-photon decay width of χc2(1P) in γγ → χc2(1P) → J/ψγ at Belle",
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.].",
keywords = "Quarkonium, e-e Experiments",
author = "{The Belle Collaboration} and Y. Seino and K. Hayasaka and S. Uehara and I. Adachi and H. Aihara and {Al Said}, S. and Asner, {D. M.} and H. Atmacan and T. Aushev and R. Ayad and V. Babu and S. Bahinipati and P. Behera and K. Belous and J. Bennett and M. Bessner and V. Bhardwaj and B. Bhuyan and T. Bilka and D. Bodrov and G. Bonvicini and J. Borah and A. Bozek and M. Bra{\v c}ko and P. Branchini and Browder, {T. E.} and A. Budano and M. Campajola and D. {\v C}ervenkov and Chang, {M. C.} and P. Chang and V. Chekelian and A. Chen and Cheon, {B. G.} and K. Chilikin and Cho, {H. E.} and K. Cho and Cho, {S. J.} and Choi, {S. K.} and Y. Choi and S. Choudhury and D. Cinabro and S. Das and {De Pietro}, G. and R. Dhamija and {Di Capua}, F. and J. Dingfelder and Z. Dole{\v z}al and Dong, {T. V.} and H. Park",
note = "Publisher Copyright: {\textcopyright} 2023, The Author(s).",
year = "2023",
month = feb,
doi = "10.1007/JHEP01(2023)160",
language = "English",
volume = "2023",
journal = "Journal of High Energy Physics",
issn = "1029-8479",
publisher = "Springer Verlag",
number = "1",
}