High Statistics Measurement of the Cross Sections of γγ→π+π- Production

Takashi Mori ,Y Usov,T Tsukamoto,T Medvedeva,Y Watanabe,J Dalseno,H Stoeck,H Shibuya,A Matyja,S L Olsen,U Bitenc,J Schümann,Y Choi,T Aushev,Y Teramoto,M Tanaka,B Shwartz,R Itoh,H Park,W T Chen,E Nakano,C P Shen,S Uno,A Somov,P Pakhlov,H Aihara,S K Kim,Y Sakai,K Belous,S Okuno,W.-S Hou,R Mizuk,S Stanič,I Adachi,S Mconie,N Soni,A Bay,T Ohshima,Y Nagasaka,M E Sevior,H Ha,A Poluektov,T E Browder,M Starič,N Satoyama,K Vervink,A Drutskoy,L E Piilonen,S Villa,Y Hoshi,C H Wang,E Won,H Ozaki,C C Kuo,H Miyata,T Tsuboyama,D Liventsev,T Kawasaki,J Li,K Inami,G N Taylor,J H Kang,A Bondar,J Macnaughton,K Abe,M Shapkin,M Hazumi,R Pestotnik,J B Singh,H O Kim,H Nakazawa,A Sokolov,H Hayashii,S Korpar,G R Moloney,A Vinokurova,M J Lee,T Hokuue,Y Yamashita,N Katayama,S Blyth,S Uehara,V Zhulanov,T Sumiyoshi,A Limosani,K Ikado,G Varner,C W Park,T Lesiak,T Iijima,O Schneider,Y Unno,X C Tian,S Noguchi,N Gabyshev,A M Bakich,V Balagura,H Kichimi,A Yamaguchi,G Pakhlova,A Chen,F Mandl,B Golob,K Hayasaka,A Kuzmin,A Ishikawa,I Tikhomirov,W Ostrowicz,F Takasaki,P Wang,R Kumar,I Bizjak,Z P Zhang,P Urquijo,S Fratina,K Arinstein,S E Lee,B G Cheon,Y J Kim,P Kapusta,S Nishida,Y Onuki,K Ueno,M Iwasaki,C C Zhang,D Heffernan,M Bračko,V Zhilich,A Zupanc,Z Natkaniec,T Uglov,P Križan,O Nitoh,Y Miyazaki,K S Park,A Imoto,M Dash,H Miyake,T Matsumoto,P Krokovny,V Aulchenko,K Tamai,M Nakao,S Eidelman,H Sahoo,K Senyo,I S Cho ,Shunsuke Ono ,Qingguo Xie ,Hiroshi Kaji ,M C Chang ,S K Choi ,B Yabsley ,E L Barberio ,S W Lin ,Y J Kwon ,Shingo Suzuki

doi:10.1143/jpsj.76.074102

Abstract

We report on a high statistics measurement of the total and differential cross sections of the process γγ→π + π - in the π + π - invariant mass range 0.8 GeV/ c 2 < W <1.5 GeV/ c 2 with 85.9 fb -1 of data collected at \(\sqrt{s}=10.58\) GeV and 10.52 GeV with the Belle detector. A clear signal of the f 0 (980) resonance is observed in addition to the f 2 (1270) resonance. An improved 90% confidence level upper limit B (η'(958)→π + π - )<2.9×10 -3 is obtained for P - and C P -violating decay of the η'(958) meson using the most conservative assumption about the interference with the background.

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