High-statistics study of eta pi(0) production in two-photon collisions

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/38941

Title:	High-statistics study of eta pi(0) production in two-photon collisions
Authors:	Uehara,S;Watanabe,Y;Nakazawa,H;Adachi,I;Aihara,H;Arinstein,K;Aulchenko,V;Bakich,AM;Belous,K;Bondar,A;Bracko,M;Browder,TE;Chang,P;Chen,A;Cheon,BG;Chistov,R;Choi,Y;Crnkovic,J;Dalseno,J;Dash,M;Eidelman,S;Epifanov,D;Gabyshev,N;Garmash,A;Goldenzweig,P;Ha,H;Hayasaka,K;Hayashii,H;Horii,Y;Hoshi,Y;Hou,WS;Hyun,HJ;Iijima,T;Inami,K;Ishikawa,A;Itoh,R;Iwasaki,M;Iwasaki,Y;Kang,JH;Kawai,H;Kichimi,H;Kiesling,C;Kim,HO;Kim,JH;Kim,YI;Kim,YJ;Ko,BR;Krokovny,P;Kumar,R;Kuzmin,A;Kwon,YJ;Kyeong,SH;Lee,SH;Li,J;Limosani,A;Liu,C;Liventsev,D;Louvot,R;Matyja,A;McOnie,S;Miyabayashi,K;Miyata,H;Miyazaki,Y;Mizuk,R;Mori,T;Nagasaka,Y;Nakano,E;Nakao,M;Nishida,S;Nishimura,K;Nitoh,O;Ogawa,S;Ohshima,T;Okuno,S;Palka,H;Park,CW;Park,H;Park,HK;Poluektov,A;Sahoo,H;Sakai,Y;Schneider,O;Schwanda,C;Senyo,K;Sevior,ME;Shapkin,M;Shebalin,V;Shen,CP;Shiu,JG;Shwartz,B;Singh,JB;Sokolov,A;Stanic,S;Staric,M;Sumiyoshi,T;Taylor,GN;Teramoto,Y;Unno,Y;Uno,S;Urquijo,P;Usov,Y;Varner,G;Vervink,K;Vinokurova,A;Wang,CH;Wang,P;Wedd,R;Won,E;Yamashita,Y;Zhang,CC;Zhang,ZP;Zhilich,V;Zhulanov,V;Zivko,T;Zupanc,A;Zyukova,O
Contributors:	物理研究所
Keywords:	PHOTON-PHOTON COLLISIONS;BELLE;ENERGIES;GAMMA
Date:	2009
Issue Date:	2010-07-08 13:59:52 (UTC+8)
Publisher:	中央大學
Abstract:	The differential cross section for the process gamma gamma -> eta pi(0) has been measured in the kinematic range 0.84 GeV < W < 4.0 GeV, vertical bar cos thetavertical bar < 0.8, where W and theta are the energy and pi(0) (or eta) 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. Clear peaks due to the a(0)(980) and a(2)(1320) are visible. The differential cross sections are fitted in the energy region 0.9 GeV < W < 1.46 GeV to obtain the parameters of the a(0)(980). Its mass, width and Gamma B-gamma gamma(eta pi(0)) are measured to be 982.3(-0.7-4.7)(+0.6+3.1) MeV/c(2), 75.6 +/- 1.6(-10.0)(+17.4) 128(-2-43)(+3+502) eV, respectively. The energy and angular dependences above 3.1 GeV are compared with those measured in the pi(0)pi(0) channel. The integrated cross section over vertical bar cos thetavertical bar < 0.8 has a W-n dependence with n = 10.5 +/- 1.2 +/- 0.5, which is slightly larger than that for pi(0)pi(0). The differential cross sections show a sin(-4)theta dependence similar to gamma gamma -> pi(0)pi(0). The measured cross section ratio, sigma(eta pi(0))/sigma(pi(0)pi(0)) = 0.48 +/- 0.05 +/- 0.04, is consistent with a QCD-based prediction.
Relation:	PHYSICAL REVIEW D
Appears in Collections:	[Graduate Institute of Physics] journal & Dissertation

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