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arXiv 2405.09320hep-ex
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在$\sqrt{s}$ = 13 TeV质子-质子对撞的高质量双光子事例中寻找新物理

Search for new physics in high-mass diphoton events from proton-proton collisions at $\sqrt{s}$ = 13 TeV

CMS Collaboration

AI总结:

利用CMS探测器在13 TeV下采集的138 fb$^{-1}$数据,通过参数化拟合和次次领先阶QCD计算两种背景预言方法分析高质量双光子事例,未发现新物理信号,并给出了对ADD额外维和RS引力子迄今最强的限制。

摘要:

本文给出了在$\sqrt{s}$ = 13 TeV质子-质子对撞的高质量双光子事例中寻找新物理的结果。所用数据集由LHC上的CMS探测器于2016-2018年采集,对应积分亮度为138 fb$^{-1}$。研究考虑双光子不变质量大于500 GeV的事例。采用两种不同技术预言标准模型背景:对平滑下降的背景进行参数化拟合,以及在微扰量子色动力学计算中对标准模型双光子谱进行次次领先阶的第一性原理计算。第一种技术对共振超出敏感,第二种技术能够识别不变质量形状中的宽泛差异。数据被用于限制重希格斯玻色子、Randall-Sundrum引力子、Arkani-Hamed、Dimopoulos和Dvali(ADD)大额外维模型以及连续clockwork机制的产生。未观测到统计显著的超出。当前结果是迄今为止对ADD额外维和耦合参数大于0.1的RS引力子最强的限制。

英文摘要:

Results are presented from a search for new physics in high-mass diphoton events from proton-proton collisions at $\sqrt{s}$ = 13 TeV. The data set was collected in 2016-2018 with the CMS detector at the LHC and corresponds to an integrated luminosity of 138 fb$^{-1}$. Events with a diphoton invariant mass greater than 500 GeV are considered. Two different techniques are used to predict the standard model backgrounds: parametric fits to the smoothly-falling background and a first-principles calculation of the standard model diphoton spectrum at next-to-next-to-leading order in perturbative quantum chromodynamics calculations. The first technique is sensitive to resonant excesses while the second technique can identify broad differences in the invariant mass shape. The data are used to constrain the production of heavy Higgs bosons, Randall-Sundrum gravitons, the large extra dimensions model of Arkani-Hamed, Dimopoulos, and Dvali (ADD), and the continuum clockwork mechanism. No statistically significant excess is observed. The present results are the strongest limits to date on ADD extra dimensions and RS gravitons with a coupling parameter greater than 0.1.

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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