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arXiv 0803.0601nucl-th
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Gerasimov-Drell-Hearn求和规则与CLAS和SAPHIR新数据的差异

Gerasimov-Drell-Hearn Sum Rule and the Discrepancy between the New CLAS and SAPHIR Data

T. Mart

摘要:

本文用最新的SAPHIR或CLAS微分截面数据拟合了K^+Λ通道对Gerasimov-Drell-Hearn(GDH)求和规则的贡献。结果表明,这两个数据集产生相当不同的贡献。还计算了该通道对质子前向自旋极化率的贡献。计算结果表明,在拟合数据库中加入最近的CLAS C_x和C_z数据并不显著改变目前的计算结果。然而,拟合的结果揭示了S_{11}(1650)、P_{11}(1710)、P_{13}(1720)和P_{13}(1900)共振在描述C_x和C_z数据中的作用。简要讨论了这些共振的重要性。由CLAS、LEPS和MAMI合作进行的极化总截面σ_{TT '}的测量有望验证这一发现。

英文摘要:

Contribution of the K^+Λchannel to the Gerasimov-Drell-Hearn (GDH) sum rule has been calculated by using the models that fit the recent SAPHIR or CLAS differential cross section data. It is shown that the two data sets yield quite different contributions. Contribution of this channel to the forward spin polarizability of the proton has been also calculated. It is also shown that the inclusion of the recent CLAS C_x and C_z data in the fitting data base does not significantly change the result of the present calculation. Results of the fit, however, reveal the role of the S_{11}(1650), P_{11}(1710), P_{13}(1720), and P_{13}(1900) resonances for the description of the C_x and C_z data. A brief discussion on the importance of these resonances is given. Measurements of the polarized total cross section σ_{TT'} by the CLAS, LEPS, and MAMI collaborations are expected to verify this finding.

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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