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arXiv 0912.4833nucl-ex
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入射光子数从1.1到3.6 GeV时γ n到K+ σ- on束缚中子的微分截面

Differential cross section of gamma n to K+ Sigma- on bound neutrons with incident photons from 1.1 to 3.6 GeV

S. Anefalos Pereira, M. Mirazita, P. Rossi, E. De Sanctis, G. Niculescu, I. Niculescu, S. Stepanyan

摘要:

用Jefferson实验室的CLAS探测器测量了γ d到K+ Sigma-(p)反应的微分截面,入射光子的能量在1.1和3.6 GeV之间。这是第一套完整的涵盖广泛角度范围的中子奇异光生数据。在接近阈值的能量和高达E_gamma ~ 1.8 GeV,角分布的形状是暗示的s-通道的产生机制的存在。当E_γ> 1.8GeV时,出现了一个明显的正向峰,并随着光子能量的增加而变得更加突出,表明t沟道产生机制的贡献。这些数据可用于限制该反应的未来分析。

英文摘要:

Differential cross sections of the reaction gamma d to K+ Sigma- (p) have been measured with the CLAS detector at Jefferson Lab using incident photons with energies between 1.1 and 3.6 GeV. This is the first complete set of strangeness photoproduction data on the neutron covering a broad angular range. At energies close to threshold and up to E_gamma ~ 1.8 GeV, the shape of the angular distribution is suggestive of the presence of s-channel production mechanisms. For E_gamma > 1.8 GeV, a clear forward peak appears and becomes more prominent as the photon energy increases, suggesting contributions from t-channel production mechanisms. These data can be used to constrain future analysis of this reaction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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