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arXiv 0904.0458hep-phhep-ex
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小x_B下的深虚康普顿散射和对GPD H的研究

Deeply virtual Compton scattering at small x_B and the access to the GPD H

Kresimir Kumericki, Dieter Mueller

摘要:

本文用广义部分子分布对H1和ZEUS合作在小x_B区的深虚康普顿散射(DVCS)测量给出了部分子解释。从而我们有一个更仔细地看偏度效应,参数化的t依赖,揭示色磁坡密子,并在一个模型依赖的访问核子的异常重力磁矩。我们还量化了广义部分子分布的重新参数化所产生的辐射校正列入下一个到下一个到领先的顺序。除了领先的顺序近似,我们的研究结果是兼容的“全息”的原则,将产生一个(破)SO(2,1)对称性。利用我们的领先顺序的研究结果,我们还执行第一个模型依赖的色散关系拟合的HERMES和JLAB DVCS测量。由此,我们提取了广义部分子分布H的交叉线和预测的光束电荷自旋不对称性,可测量的COMPASS。

英文摘要:

We give a partonic interpretation for the deeply virtual Compton scattering (DVCS) measurements of the H1 and ZEUS collaborations in the small-x_B region in terms of generalized parton distributions. Thereby we have a closer look at the skewness effect, parameterization of the t-dependence, revealing the chromomagnetic pomeron, and at a model dependent access to the anomalous gravitomagnetic moment of nucleon. We also quantify the reparameterization of generalized parton distributions resulting from the inclusion of radiative corrections up to next-to-next-to-leading order. Beyond the leading order approximation, our findings are compatible with a `holographic' principle that would arise from a (broken) SO(2,1) symmetry. Utilizing our leading-order findings, we also perform a first model dependent dispersion relation fit of HERMES and JLAB DVCS measurements. From that we extract the generalized parton distribution H on its cross-over line and predict the beam charge-spin asymmetry, measurable at COMPASS.

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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