arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2111.09698hep-ph
收藏

提高大型强子对撞机对新规范扇区荷电和中性宽共振的灵敏度

Enhancing the Large Hadron Collider Sensitivity to Charged and Neutral Broad Resonances of New Gauge Sectors

Juri Fiaschi, Francesco Giuli, Francesco Hautmann, Stefano Moretti

备注：
15 pages, 6 figures
发表信息：
JHEP 02 (2022) 179
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

在超出标准模型（BSM）的情况下，特征是带电（$W^\prime$）或中性（$Z^\prime$）大质量规范玻色子具有大宽度，共振质量搜索不是很有效，因此必须利用质量分布的尾部在大型强子对撞机（LHC）上测量。在这种情况下，LHC对新物理信号的灵敏度受到与部分子分布函数（PDF）相关的系统不确定性的显著影响，特别是在与多TeV质量区域相关的价夸克扇区中。作为一个具有这种条件的BSM框架，我们考虑了四维复合希格斯模型（4DCHM），其中存在多个$W^\prime$和$Z^\prime$宽共振，具有强关联性质。利用QCD工具xFitter，研究了结合DY轻子电荷和前后向不对称性的高统计精度测量所得到的PDF不确定度的降低对Drell-Yan（DY）轻子衰变道中$W^\prime$和$Z^\prime$搜索的影响.我们发现，BSM状态的灵敏度大大增加相对于基础PDF集的情况下，从而使人们能够设置更严格的限制（或确实发现）这样的新粒子，无论是独立的和相关的搜索。

英文摘要：

In scenarios beyond the Standard Model (BSM) characterized by charged ($W^\prime$) or neutral ($Z^\prime$) massive gauge bosons with large width, resonant mass searches are not very effective, so that one has to exploit the tails of the mass distributions measured at the Large Hadron Collider (LHC). In this case, the LHC sensitivity to new physics signals is influenced significantly by systematic uncertainties associated with the Parton Distribution Functions (PDF), particularly in the valence quark sector relevant for the multi-TeV mass region. As a BSM framework featuring such conditions, we consider the 4-Dimensional Composite Higgs Model (4DCHM), in which multiple $W^\prime$ and $Z^\prime$ broad resonances are present, with strongly correlated properties. By using the QCD tool xFitter, we study the implications on $W^\prime$ and $Z^\prime$ searches in Drell-Yan (DY) lepton decay channels that follow from the reduction of PDF uncertainties obtained through combining high-statistics precision measurements of DY lepton-charge and forward-backward asymmetries. We find that the sensitivity to the BSM states is greatly increased with respect to the case of base PDF sets, thereby enabling one to set more stringent limits on (or indeed discover) such new particles, both independently and in correlated searches.

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。

↑