Combination of measurements of inclusive deep inelastic e±p scattering cross sections and QCD analysis of HERA data
Combination of measurements of inclusive deep inelastic e±p scattering cross sections and QCD analysis of HERA data
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DOI：
10.1140/epjc/s10052-015-3710-4
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发表时间：
2015-12-08
影响因子：
4.4
通讯作者：
Zotkin, D. S.
中科院分区：
文献类型：
--
作者：
Abramowicz, H.;Abt, I.;Zotkin, D. S.
本文给出了先前由HERA的H1和ZEUS合作发表的中性和带电电流零束极化e(+/-)p散射的所有包括深度非弹性截面的组合。质子束能量分别为920、820、575和460 GeV，电子束能量为27.5 GeV。这些数据对应于大约1 fb（-1）的综合光度，在负4动量传递平方、Q(2)和Bjorken x中跨越6个数量级。我们评估了系统不确定性的相关性，并在组合中考虑了这些相关性。将组合的横截面按领先顺序、次领先顺序和次领先顺序输入到QCD分析中，提供一组新的部分分布函数，称为HERAPDF2.0。除了实验不确定性外，还评估了这些部分分布函数的模型和参数化不确定性。本文介绍了采用胶子参数化的HERAPDF2.0的变体HERAPDF2.0 ag和采用固定风味数方案的HERAPDF2.0 ff。该分析通过纳入HERA的符码和喷气机生产数据进行扩展，从而产生了变体herapdf2.0喷气机。射流生产截面的包含使得这些部分分布和强耦合常数的同时测定成为可能，结果为alpha(s) (M-Z(2)) = 0.1183 +/- 0.0009(exp) +/- 0.0005（模型/参数化）+/- 0.0012（强子化）（-0.0030）（+0.0037）（尺度）。给出了xF(3)（gamma Z）的提取，以及电弱统一和标度违逆的结果。
A combination is presented of all inclusive deep inelastic cross sections previously published by the H1 and ZEUS collaborations at HERA for neutral and charged current e(+/-)p scattering for zero beam polarisation. The data were taken at proton beam energies of 920, 820, 575 and 460 GeV and an electron beam energy of 27.5 GeV. The data correspond to an integrated luminosity of about 1 fb(-1) and span six orders of magnitude in negative four-momentum-transfer squared, Q(2), and Bjorken x. The correlations of the systematic uncertainties were evaluated and taken into account for the combination. The combined cross sections were input to QCD analyses at leading order, next-to-leading order and at next-to-next-to-leading order, providing a new set of parton distribution functions, called HERAPDF2.0. In addition to the experimental uncertainties, model and parameterisation uncertainties were assessed for these parton distribution functions. Variants of HERAPDF2.0 with an alternative gluon parameterisation, HERAPDF2.0AG, and using fixed-flavour-number schemes, HERAPDF2.0FF, are presented. The analysis was extended by including HERA data on charm and jet production, resulting in the variant HERAPDF2.0Jets. The inclusion of jet-production cross sections made a simultaneous determination of these parton distributions and the strong coupling constant possible, resulting in as alpha(s) (M-Z(2)) = 0.1183 +/- 0.0009(exp) +/- 0.0005(model/parameterisation) +/- 0.0012(hadronisation)(-0.0030)(+0.0037)(scale). An extraction of xF(3)(gamma Z) and results on electroweak unification and scaling violations are also presented.