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  • Measurement of two-photon d...
    Seino, Y.; Hayasaka, K.; Uehara, S.; Aihara, H.; Ayad, R.; Babu, V.; Behera, P.; Bennett, J.; Bessner, M.; Bhardwaj, V.; Bhuyan, B.; Bozek, A.; Bračko, M.; Browder, T. E.; Budano, A.; Campajola, M.; Červenkov, D.; Cheon, B. G.; Cho, H. E.; Choi, Y.; Choudhury, S.; Cinabro, D.; Das, S.; Dhamija, R.; Dong, T. V.; Ferlewicz, D.; Garg, R.; Gaur, V.; Gabyshev, N.; Goldenzweig, P.; Graziani, E.; Hayashii, H.; Hsu, C.-L.; Inami, K.; Ishikawa, A.; Itoh, R.; Jia, S.; Jin, Y.; Joo, K. K.; Kang, K. H.; Kiesling, C.; Kim, D. Y.; Kim, Y.-K.; Konno, T.; Korobov, A.; Korpar, S.; Kovalenko, E.; Križan, P.; Krokovny, P.; Kumar, M.; Kumara, K.; Lam, T.; Li, L. K.; Li, Y.; Lieret, K.; Matsuda, T.; Matvienko, D.; Maurya, S. K.; Merola, M.; Miyata, H.; Mizuk, R.; Mrvar, M.; Natochii, A.; Nayak, L.; Niiyama, M.; Nishida, S.; Ogawa, S.; Onuki, Y.; Park, H.; Paul, S.; Pedlar, T. K.; Piilonen, L. E.; Podobnik, T.; Prim, M. T.; Rout, N.; Sanuki, T.; Schnell, G.; Shapkin, M.; Sharma, C.; Shen, C. P.; Shiu, J.-G.; Singh, J. B.; Sokolov, A.; Stottler, Z. S.; Sumihama, M.; Sumiyoshi, T.; Tenchini, F.; Uchida, M.; Uglov, T.; Unno, Y.; van Tonder, R.; Vinokurova, A.; Waheed, E.; Wang, E.; Yabsley, B. D.; Yang, S. B.; Yuan, C. Z.; Zhai, Y.; Zhilich, V.; Zhukova, V.

    The journal of high energy physics, 30/1, Letnik: 2023, Številka: 1
    Journal Article

    A bstract We report the measurement of the two-photon decay width of χ c 2 (1 P ) in two-photon processes at the Belle experiment. We analyze the process γγ → χ c 2 (1 P ) → 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 χ c 2 (1 P ) and the branching fraction is determined to be Γ γγ χ c 2 1 P B χ c 2 1 P → J / ψγ B J / ψ → ℓ + ℓ − = 14.8 ± 0.3 stat . ± 0.7 syst . eV, which corresponds to Γ γγ ( χ c 2 (1 P )) = 653 ± 13(stat.) ± 31(syst.) ± 17(B.R.) eV, where the third uncertainty is from B ( χ c 2 (1 P ) → J/ψγ ) and B ( J/ψ → ℓ + ℓ − ).