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首页> 外文期刊>Physical review, C >Low-energy η-nucleon interaction studied with η photoproduction off the deuteron
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Low-energy η-nucleon interaction studied with η photoproduction off the deuteron

机译：低能量η-核聚象相互作用与氘静电研究研究

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摘要

We develop a reaction model for η photoproduction off the deuteron (γd → ηpn) and study the reaction at a special kinematics, where the photon beam energy is ~0.94 GeV and the scattered proton is detected at ~0°, for the purpose of determining the η-nucleon scattering length (a_ηN ) and effective range (r_ηN ). In this kinematics, the η-nucleon elastic rescattering is significantly enhanced while other background mechanisms are suppressed. We show that a ratio R, the γd → ηpn cross section divided by the γp → ηp cross section convoluted with the proton momentum distribution in the deuteron, has a very good resolving power of a_ηN and r_ηN . We conclude that the R data with 5% error, binned in 1 MeV width of the η-neutron invariant mass, can determine Re[a_ηN] (Re[r_ηN ]) at the precision of ~±0.1 fm (~±0.5 fm), significantly narrowing down the previously estimated ranges of the parameters. To arrive at the conclusion, it is essential to use the γd → ηpn reaction model equipped with elementary amplitudes that are well constrained by πN and γN reaction data through a sophisticated coupled-channel analysis. This result strongly motivates the Research Center for Electron Photon Science (ELPH) at Tohoku University to measure R.
机译：我们开发氘（γd→ηpn）的ηphotocroduction的反应模型，并在特殊运动学中研究反应，其中光子束能量是〜0.94 gev，并且在〜0°处检测到散射的质子，以便确定η-核子散射长度（a_ηn）和有效范围（R_ηn）。在这种运动学中，η-nucleors弹性resmatter明显增强，而抑制其他背景机制。我们表明比率R，γd→ηpn横截面除以氘代的质子动量分布旋转的γp→ηp横截面，具有α_ηn和r_ηn的非常好的分辨率。我们得出结论，具有5％误差的R数据，在η-中子不变质量的1 MeV宽度中，可以确定〜±0.1 fm（〜±0.5 fm）的精度测量[a_ηn]（Re [r_hnn]） ，显着缩小先前估计的参数范围。为了得出结论，必须使用配备有γd→ηpn反应模型的γd→ηpn反应模型通过复杂的耦合通道分析通过πn和γn反应数据良好地限制。这一结果强烈激发了东北大学电子光子科学（Elph）的研究中心，以测量R.

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