arXiv 2012.102982020-12hep-ph

纵向Z玻色子极化和大型强子对撞机上希格斯玻色子产生截面

Longitudinal Z-Boson Polarization and the Higgs Boson Production Cross Section at the Large Hadron Collider

S. Amoroso, J. Fiaschi, F. Giuli, A. Glazov, F. Hautmann, O. Zenaiev

备注：: Latex, 7 pages. Version v2: comments, references and figure added, typos corrected, results unchanged
DOI：: 10.1016/j.physletb.2021.136613

摘要：

带电轻子对在高能强子碰撞中通过电弱规范玻色子交换大量产生，并且是大型强子对撞机（LHC）中质子-质子碰撞中最精确测量的终态之一。我们提出轻子角分布的测量可以用来提高LHC中希格斯玻色子产生截面的理论预测的准确性。为此，我们利用轻子角系数的灵敏度与纵向Z玻色子极化的部分子密度函数（PDF）的胶子解决从入射质子，以约束希格斯玻色子截面胶子融合过程。通过使用开源平台xFitter进行详细的数值分析，我们发现在LHC运行III和高亮度HL-LHC上对纵向偏振角系数的高统计测定在广泛的希格斯玻色子快速性范围内将希格斯玻色子截面预测的PDF系统不确定性提高了50%.

英文摘要：

Charged lepton pairs are produced copiously in high-energy hadron collisions via electroweak gauge boson exchange, and are one of the most precisely measured final states in proton-proton collisions at the Large Hadron Collider (LHC). We propose that measurements of lepton angular distributions can be used to improve the accuracy of theoretical predictions for Higgs boson production cross sections at the LHC. To this end, we exploit the sensitivity of the lepton angular coefficient associated with the longitudinal Z-boson polarization to the parton density function (PDF) for gluons resolved from the incoming protons, in order to constrain the Higgs boson cross section from gluon fusion processes. By a detailed numerical analysis using the open-source platform xFitter, we find that high-statistics determinations of the longitudinally polarized angular coefficient at the LHC Run III and high-luminosity HL-LHC improve the PDF systematic uncertainties of the Higgs boson cross section predictions by 50% over a broad range of Higgs boson rapidities.

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英文摘要：

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