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

	High-statistics study of eta pi(0) production in two-photon collisions
	Belle Collaboration
刊名	PHYSICAL REVIEW D
	2009
卷号	80 期号:3
关键词	PHOTON-PHOTON COLLISIONS BELLE ENERGIES GAMMA
通讯作者	Uehara, S (reprint author), High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki, Japan.
英文摘要	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.
学科主题	Astronomy & Astrophysics; Physics
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
收录类别	SCI
语种	英语
WOS记录号	WOS:000269641100008
公开日期	2016-02-26
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/212905]
专题	高能物理研究所_实验物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Belle Collaboration. High-statistics study of eta pi(0) production in two-photon collisions[J]. PHYSICAL REVIEW D,2009,80(3).
APA	Belle Collaboration.(2009).High-statistics study of eta pi(0) production in two-photon collisions.PHYSICAL REVIEW D,80(3).
MLA	Belle Collaboration."High-statistics study of eta pi(0) production in two-photon collisions".PHYSICAL REVIEW D 80.3(2009).