Evidence For X(3872) -> J/Psi Pi(+)Pi(-) Produced In Single-Tag Two-Photon Interactions

Y Teramoto, S Uehara,M Masuda,I Adachi,H Aihara,S Al Said, D M Asner, H Atmacan,T Aushev, R Ayad, V Babu,P Behera, C Beleño, J Bennett,V Bhardwaj,B Bhuyan, T Bilka,J Biswal,G Bonvicini, A Bozek, M Bračko,T E Browder,M Campajola, D Červenkov,M-C Chang,P Chang,V Chekelian,A Chen,B G Cheon,K Chilikin,K Cho,S-J Cho,S-K Choi,Y Choi,S Choudhury,D Cinabro,S Cunliffe,G De Nardo,F Di Capua,Z Doležal, T V Dong,S Eidelman,T Ferber,B G Fulsom,R Garg,V Gaur,N Gabyshev,A Garmash,A Giri, P Goldenzweig,D Greenwald,C Hadjivasiliou,T Hara,O Hartbrich, K Hayasaka,H Hayashii,M T Hedges,M Hernandez Villanueva,W-S Hou,C-L Hsu,T Iijima,K Inami, G Inguglia, A Ishikawa,R Itoh,M Iwasaki, Y Iwasaki,W W Jacobs,E-J Jang,S Jia,Y Jin, C W Joo,K K Joo,J Kahn,A B Kaliyar,K H Kang, G Karyan,Y Kato,T Kawasaki, H Kichimi, C Kiesling, B H Kim,D Y Kim, S H Kim,Y-K Kim,T D Kimmel,K Kinoshita, P Kodyš,S Korpar, D Kotchetkov, P Križan,R Kroeger,P Krokovny,T Kuhr,R Kulasiri,R Kumar,K Kumara,A Kuzmin,Y-J Kwon, K Lalwani, J S Lange,I S Lee,S C Lee,P Lewis,L K Li, Y B Li,L Li Gioi,J Libby, K Lieret,Z Liptak,D Liventsev,T Luo,C MacQueen,T Matsuda,D Matvienko,M Merola,K Miyabayashi,H Miyata,G B Mohanty,S Mohanty,T J Moon,T Mori,M Mrvar, R Mussa, E Nakano,M Nakao,H Nakazawa,Z Natkaniec,A Natochii,M Nayak,N K Nisar,S Nishida,K Ogawa,S Ogawa,H Ono, Y Onuki,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,V Popov, E Prencipe,M T Prim,M Ritter,A Rostomyan,N Rout,G Russo,D Sahoo, Y Sakai,S Sandilya,A Sangal, L Santelj,T Sanuki, V Savinov, G Schnell,J Schueler,C Schwanda, Y Seino,K Senyo,M E Sevior, M Shapkin, V Shebalin,J-G Shiu,J B Singh,E Solovieva, M Starič,Z S Stottler, M Sumihama,K Sumisawa, T Sumiyoshi, W Sutcliffe,M Takizawa,U Tamponi, F Tenchini,M Uchida,T Uglov, Y Unno,S Uno, P Urquijo,Y Usov,R Van Tonder, G Varner,A Vinokurova,V Vorobyev,E Waheed,C H Wang,E Wang,M-Z Wang,P Wang,X L Wang,M Watanabe, E Won,X Xu,B D Yabsley, S B Yang,H Ye,J Yelton, J H Yin, Z P Zhang,V Zhilich,V Zhukova,V Zhulanov

PHYSICAL REVIEW LETTERS（2021）

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摘要

We report the first evidence for X(3872) production in two-photon interactions by tagging either the electron or the positron in the final state, exploring the highly virtual photon region. The search is performed in e(+) e(-) -> e(+)e(-) J/Psi pi(+)pi(-), using 825 fb(-1) of data collected by the Belle detector operated at the KEKB e(+) e(-) - collider. We observe three X(3872) candidates, where the expected background is 0.11 +/- 0.10 events, with a significance of 3.2 sigma. We obtain an estimated value for (Gamma) over tilde (gamma gamma) B(x(3872) -> j/Psi pi(+)pi(-)) assuming the Q(2) dependence predicted by a c (c) over bar meson model, where -Q(2) is the invariant mass squared of the virtual photon. No X(3915) -> J/Psi pi(+)pi(-) candidates are found.

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