High-statistics study of neutral-pion pair production in two-photon collisions

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题名:	High-statistics study of neutral-pion pair production in two-photon collisions
作者:	Uehara,S;Watanabe,Y;Nakazawa,H;Aihara,H;Arinstein,K;Aulchenko,V;Bakich,AM;Barberio,E;Belous,K;Bhardwaj,V;Bondar,A;Bozek,A;Bracko,M;Browder,TE;Chen,A;Cheon,BG;Chistov,R;Cho,IS;Choi,SK;Choi,Y;Dash,M;Eidelman,S;Epifanov,D;Gabyshev,N;Goldenzweig,P;Ha,H;Haba,J;Han,BY;Hayasaka,K;Hayashii,H;Hazumi,M;Hoshi,Y;Hou,WS;Hyun,HJ;Inami,K;Ishikawa,A;Iwasaki,Y;Joshi,NJ;Kah,DH;Katayama,N;Kawasaki,T;Kichimi,H;Kim,HO;Kim,YI;Kim,YJ;Korpar,S;Krizan,P;Krokovny,P;Kuzmin,A;Kwon,YJ;Lee,MJ;Lesiak,T;Liu,Y;Liventsev,D;Louvot,R;McOnie,S;Miyata,H;Mizuk,R;Nagasaka,Y;Nakao,M;Nishida,S;Nishimura,K;Nitoh,O;Ogawa,S;Ohshima,T;Okuno,S;Pakhlov,P;Pakhlova,G;Park,CW;Park,H;Park,HK;Pestotnik,R;Piilonen,LE;Poluektov,A;Sahoo,H;Sakai,Y;Schneider,O;Senyo,K;Shapkin,M;Shiu,JG;Shwartz,B;Staric,M;Sumiyoshi,T;Tanaka,M;Teramoto,Y;Tikhomirov,I;Uglov,T;Unno,Y;Uno,S;Usov,Y;Varner,G;Vervink,K;Vinokurova,A;Wang,CH;Wang,P;Yabsley,BD;Yamashita,Y;Zhang,CC;Zhang,ZP;Zhilich,V;Zhulanov,V;Zivko,T;Zupanc,A;Zyukova,O
贡献者:	物理研究所
关键词:	BELLE;ENERGIES;GAMMA;KK
日期:	2009
上传时间:	2010-07-08 13:59:53 (UTC+8)
出版者:	中央大學
摘要:	The differential cross sections for the process gamma gamma -> pi(0)pi(0) have been measured in the kinematic range 0.6 GeV < W < 4.1 GeV, vertical bar cos theta* vertical bar < 0.8 in energy and pion scattering angle, respectively, in the gamma gamma center-of-mass system. The results are based on a 223 fb(-1) data sample collected with the Belle detector at the KEKB e(+)e(-) collider. The differential cross sections are fitted in the energy region 1.7 GeV < W < 2.5 GeV to confirm the two-photon production of two pions in the G wave. In the higher-energy region, we observe production of the chi(c0) charmonium state and obtain the product of its two-photon decay width and branching fraction to pi(0)pi(0). We also compare the observed angular dependence and ratios of cross sections for neutral-pion and charged-pion pair production to QCD models. The energy and angular dependence above 3.1 GeV are compatible with those measured in the pi(+)pi(-) channel, and in addition we find that the cross section ratio, sigma(pi(0)pi(0))/sigma(pi(+)pi(-)), is 0.32 +/- 0.03 +/- 0.05 on average in the 3.1-4.1 GeV region.
關聯:	PHYSICAL REVIEW D
显示于类别:	[物理研究所] 期刊論文

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