质子横向结构提取中的分箱间关联
Bin-to-bin correlations in the extraction of proton's transverse structure
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- Université Libre de Bruxelles(布鲁塞尔自由大学)
- University of Oxford(牛津大学)
- Universiteit Antwerpen(安特卫普大学)
- Universität Hamburg(汉堡大学)
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中文总结 AI 辅助
本研究揭示LHC电弱玻色子产生数据中跨横向动量分箱的关联不确定性对质子横向结构非微扰QCD参数提取的显著影响,并通过LHCb与CMS测量对比及多种效应分析加以验证。
中文摘要 AI 辅助
我们研究了从LHC电弱玻色子产生的高精度实验数据中确定与质子横向结构相关的非微扰QCD贡献的问题。我们证明,在玻色子低横向动量区域,这些确定受到跨横向动量分箱的关联不确定性的强烈影响。我们通过对LHCb在前向快度下测量的$Z$玻色子谱的详细分析,以及与CMS在中心快度下测量的比较,来展示我们的结果。我们进一步考察了末态电磁辐射、光子诱导背景、前向区域部分子分布的大$x$贡献以及匹配到微扰次领头阶对这些非微扰参数提取的影响。我们评论了我们的结果与部分子簇射蒙特卡洛事件生成器底层事件调优结果的比较。
英文摘要
We investigate the determination of non-perturbative QCD contributions, associated with proton's transverse structure, from high-precision experimental data for electroweak boson production at the LHC. We demonstrate that these determinations are strongly affected by correlated uncertainties across transverse-momentum bins in the region of low boson's transverse momenta. We illustrate our results through a detailed analysis of LHCb measurements of $Z$-boson spectra at forward rapidities, and a comparison with CMS measurements at central rapidities. We further examine the influence on the extraction of the non-perturbative parameters from final-state electromagnetic radiation, photon-induced background, large-$x$ contributions to parton distributions in the forward region, matching to perturbative next-to-leading order. We comment on the comparison of our results with those from the underlying-event tuning of parton-shower Monte Carlo event generators.