High-statistics study of neutral-pion pair production in two-photon collisions
Belle Collaboration
刊名PHYSICAL REVIEW D
2009
卷号79期号:5
关键词BELLE ENERGIES GAMMA KK
学科分类Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.79.052009
通讯作者Uehara, S (reprint author), Natl Lab High Energy Phys, KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki 305, Japan.
英文摘要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.
类目[WOS]Astronomy & Astrophysics ; Physics, Particles & Fields
收录类别SCI
语种英语
WOS记录号WOS:000264762400016
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被引频次:33[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/212894
专题中国科学院高能物理研究所_实验物理中心_期刊论文
作者单位中国科学院高能物理研究所
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Belle Collaboration. High-statistics study of neutral-pion pair production in two-photon collisions[J]. PHYSICAL REVIEW D,2009,79(5).
APA Belle Collaboration.(2009).High-statistics study of neutral-pion pair production in two-photon collisions.PHYSICAL REVIEW D,79(5).
MLA Belle Collaboration."High-statistics study of neutral-pion pair production in two-photon collisions".PHYSICAL REVIEW D 79.5(2009).
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