Study of e plus e- 0 over bar 0 and plus over bar - by initial state radiation method at Belle
G. Gong,L. K. Li,Y. Zhang,W. Yan,I. Adachi,H. Aihara,S. Al Said,D. M. Asner,H. Atmacan,T. Aushev,R. Ayad,V. Babu,Sw. Banerjee,P. Behera,K. Belous,J. Bennett,M. Bessner,B. Bhuyan,T. Bilka,D. Biswas,A. Bobrov,D. Bodrov,J. Borah,A. Bozek,M. Bracko,P. Branchini,T. E. Browder,A. Budano,M. Campajola,D. Cervenkov,M. -C. Chang,A. Chen,Y. Chen,B. G. Cheon,K. Chilikin,K. Cho,S. -J. Cho,S. -K. Choi,Y. Choi,S. Choudhury,D. Cinabro,S. Das,G. De Nardo,G. De Pietro,R. Dhamija,F. Di Capua,Z. Dolezal,T. Dong,D. Epifanov,T. Ferber,D. Ferlewicz,B. G. Fulsom,R. Garg,V. Gaur,A. Garmash,A. Giri,P. Goldenzweig,B. Golob,E. Graziani,K. Gudkova,S. Halder,K. Hayasaka,H. Hayashii,M. T. Hedges,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,A. B. Kaliyar,K. H. Kang,T. Kawasaki,C. Kiesling,C. H. Kim,D. Y. Kim,Y. -K. Kim,K. Kinoshita,P. Kodys,A. Korobov,S. Korpar,E. Kovalenko,P. Krizan,P. Krokovny,R. Kumar,K. Kumara,Y. -J. Kwon,T. Lam,J. S. Lange,S. C. Lee,P. Lewis,C. H. Li,Y. Li,Y. B. Li,L. Li Gioi,J. Libby,K. Lieret,Y. -R. Lin,D. Liventsev,T. Luo,M. Masuda,T. Matsuda,D. Matvienko,S. K. Maurya,F. Meier,M. Merola,F. Metzner,K. Miyabayashi,R. Mussa,I. Nakamura,T. Nakano,M. Nakao,Z. Natkaniec,A. Natochii,L. Nayak,M. Nayak,N. K. Nisar,S. Nishida,S. Ogawa,H. Ono,P. Oskin,P. Pakhlov,G. Pakhlova,S. Pardi,H. Park,J. Park,S. Patra,S. Paul,R. Pestotnik,L. E. Piilonen,T. Podobnik,E. Prencipe,M. T. Prim,A. Rostomyan,N. Rout,G. Russo,Y. Sakai,S. Sandilya,L. Santelj,V. Savinov,G. Schnell,J. Schueler,C. Schwanda,Y. Seino,K. Senyo,M. E. Sevior,W. Shan,M. Shapkin,C. Sharma,C. P. Shen,J. -G. Shiu,B. Shwartz,F. Simon,A. Sokolov,E. Solovieva,M. Staric,M. Sumihama,T. Sumiyoshi,W. Sutcliffe,M. Takizawa,U. Tamponi,K. Tanida,F. Tenchini,M. Uchida,S. Uehara,T. Uglov,Y. Unno,K. Uno,S. Uno,P. Urquijo,S. E. Vahsen,R. van Tonder,G. Varner,A. Vinokurova,A. Vossen,M. -Z. Wang,X. L. Wang,M. Watanabe,S. Watanuki,O. Werbycka,E. Won,X. Xu,B. D. Yabsley,S. B. Yang,J. Yelton,J. H. Yin,C. Z. Yuan,L. Yuan,Z. P. Zhang,V. Zhilich,V. Zhukova
PHYSICAL REVIEW D（2023）
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摘要
The processes e thorn e- -> sigma 0 sigma over bar 0 and e thorn e- -> sigma thorn sigma over bar - are studied using initial-state-radiation events in a sample of 980 fb-1 collected with the Belle detector at the KEKB asymmetric-energy e thorn e- collider. The cross sections from the mass threshold to 3 GeV=c2 and the effective form factors of sigma 0 and sigma thorn are measured. In the charmonium region, we observe the decays J=yr -> sigma 0 sigma over bar 0 and J=yr -> sigma thorn sigma over bar - and determine the respective branching fractions.
