Measurement of two-photon decay width of xc2(1P) in ??? xc2(1P) ? J/????????i? at Belle

Y. Seino,K. Hayasaka,S. Uehara,I. Adachi,H. Aihara,S. Al Said,D. M. Asner,H. Atmacan,T. Aushev,R. Ayad,V. Babu,S. Bahinipati,P. Behera,K. Belous,J. Bennett,M. Bessner,V. Bhardwaj,B. Bhuyan,T. Bilka,D. Bodrov,G. Bonvicini,J. Borah,A. Bozek,M. Bracko,P. Branchini,T. E. Browder,A. Budano,M. Campajola,D. Cervenkov,M. -C. Chang,P. Chang,V. Chekelian,A. Chen,B. G. Cheon,K. Chilikin,H. E. Cho,K. Cho,S. -J. Cho,S. -K. Choi,Y. Choi,S. Choudhury,D. Cinabro,S. Das,G. De Pietro,R. Dhamija,F. Di Capua,J. Dingfelder,Z. Dolezal,T. V. Dong,D. Epifanov,T. Ferber,D. Ferlewicz,B. G. Fulsom,R. Garg,V. Gaur,N. Gabyshev,A. Garmash,A. Giri,P. Goldenzweig,E. Graziani,C. Hadjivasiliou,H. Hayashii,W. -S. Hou,C. -L. Hsu,K. Inami,N. Ipsita,A. Ishikawa,R. Itoh,M. Iwasaki,W. W. Jacobs,E. -J. Jang,S. Jia,Y. Jin,K. K. Joo,H. Kakuno,K. H. Kang,G. Karyan,T. Kawasaki,C. Kiesling,C. H. Kim,D. Y. Kim,K. -H. Kim,Y. -K. Kim,P. Kodys,T. Konno,A. Korobov,S. Korpar,E. Kovalenko,P. Krizan,P. Krokovny,M. Kumar,R. Kumar,K. Kumara,T. Lam,J. S. Lange,S. C. Lee,C. H. Li,J. Li,L. K. Li,Y. Li,Y. B. Li,L. Li Gioi,J. Libby,K. Lieret,M. Masuda,T. Matsuda,D. Matvienko,S. K. Maurya,F. Meier,M. Merola,K. Miyabayashi,H. Miyata,R. Mizuk,G. B. Mohanty,M. Mrvar,R. Mussa,M. Nakao,Z. Natkaniec,A. Natochii,L. Nayak,M. Nayak,M. Niiyama,N. K. Nisar,S. Nishida,S. Ogawa,H. Ono,Y. Onuki,P. Oskin,P. Pakhlov,G. Pakhlova,S. Pardi,H. Park, S. -H. Park,S. Patra,S. Paul,T. K. Pedlar,R. Pestotnik,L. E. Piilonen,T. Podobnik,E. Prencipe,M. T. Prim,N. Rout,G. Russo,S. Sandilya,A. Sangal,L. Santelj,T. Sanuki,V. Savinov,G. Schnell,J. Schueler,C. Schwanda,K. Senyo,M. E. Sevior,M. Shapkin,C. Sharma,C. P. Shen,J. -G. Shiu,J. B. Singh,A. Sokolov,E. Solovieva,M. Staric,Z. S. Stottler,J. F. Strube,M. Sumihama,K. Sumisawa,T. Sumiyoshi,M. Takizawa,U. Tamponi,K. Tanida,F. Tenchini,M. Uchida,T. Uglov,Y. Unno,K. Uno,S. Uno,R. van Tonder,G. Varner,A. Vinokurova,E. Waheed,E. Wang,M. -Z. Wang,X. L. Wang,M. Watanabe,S. Watanuki,E. Won,B. D. Yabsley,W. Yan,S. B. Yang,J. H. Yin,C. Z. Yuan,Y. Yusa,Y. Zhai,Z. P. Zhang,V. Zhilich,V. Zhukova,V. Zhulanov

JOURNAL OF HIGH ENERGY PHYSICS（2023）

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Abstract

We report the measurement of the two-photon decay width of chi c2(1P) in two-photon processes at the Belle experiment. We analyze the process gamma gamma ->chi c2(1P)-> J/psi gamma, J/psi -> l(+)l(-) (l=e or mu) 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 chi c2(1P) and the branching fraction is determined to be gamma gamma gamma(chi c2(1P))B(chi c2(1P)-> J/psi gamma)B(J/psi -> l(+)l(-))=14.8 +/- 0.3(stat.) +/- 0.7(syst.) eV, which corresponds to gamma gamma gamma(chi c2(1P)) = 653 +/- 13(stat.) +/- 31(syst.) +/- 17(B.R.) eV, where the third uncertainty is from B(chi c2(1P)-> J/psi gamma) and B(J/psi -> l(+)l(-)).

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Key words

e(+)-e(-) Experiments,Quarkonium

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