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arXiv 1012.4408hep-ph
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AAMQS:小x下包括重夸克的新HERA数据的非线性QCD分析

AAMQS: A non-linear QCD analysis of new HERA data at small-x including heavy quarks

J. L. Albacete, N. Armesto, J. G. Milhano, P. Quiroga Arias, C. A. Salgado

摘要:

我们提出了一个全球性的分析现有的数据上的包容性结构功能和约化截面测量的电子-质子散射在小值的Bjorken-x,x<0.01,包括最新的数据从HERA约化截面。我们的方法依赖于偶极制定DIS一起使用的非线性运行耦合BK方程的描述的小x动力学。我们改进了我们以前的研究,包括重夸克(魅力和美丽)的贡献约化截面,也考虑了一个可变的风味计划的耦合运行。我们得到了很好的数据描述,拟合参数保持稳定,我们以前的分析,其中只考虑轻夸克。包含重夸克的贡献导致了对结构函数的粲分量的可用实验数据的良好描述,并且提供了允许重夸克的初始横向分布不同于(更具体地说,具有较小的半径)轻味的减小的截面。

英文摘要:

We present a global analysis of available data on inclusive structure functions and reduced cross sections measured in electron-proton scattering at small values of Bjorken-x, x<0.01, including the latest data from HERA on reduced cross sections. Our approach relies on the dipole formulation of DIS together with the use of the non-linear running coupling BK equation for the description of the small-x dynamics. We improve our previous studies by including the heavy quark (charm and beauty) contribution to the reduced cross sections, and also by considering a variable flavor scheme for the running of the coupling. We obtain a good description of data, the fit parameters remaining stable with respect to our previous analyses where only light quarks were considered. The inclusion of the heavy quark contributions resulted in a good description of available experimental data for the charm component of the structure function and reduced cross section provide the initial transverse distribution of heavy quarks was allowed to differ (more specifically, to have a smaller radius) from that of the light flavors.

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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