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arXiv 2004.12203hep-ph
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用正向质子标记法钉扎$WWγ$生产中的规范玻色子耦合

Pinning down the gauge boson couplings in $WWγ$ production using forward proton tagging

Seddigheh Tizchang, Seyed Mohsen Etesami

摘要:

在本文中,我们探索了LHC测量$\mathrm{p}\mathrm{p}\rightarrow \mathrm{p}~ WWγ~\mathrm{p}$过程速率的潜力,并探索了对$WWγ$和$WWγγ$顶点有贡献的新的有效耦合。在双轻子衰变通道中,在$\sqrt{s}=13$ TeV下进行分析,并假设$fb^{-1}$积分亮度(IL)为300。除了存在两个相反符号的轻子、一个光子和丢失的能量之外,这个过程的独特特征是存在两个完整的质子,它们在相互作用点的两侧从初始光束方向飞行几毫米,有效地抑制了背景过程。为了利用信号的这一特征,我们受益于放置在距离相互作用点约200米处的前向探测器(FD),以记录标记质子的运动学。为了克服背景的主要来源,我们介绍了三个类别的选择削减处理的对象,击中中央检测器,质子击中FD,以及中央对象和质子的相关性,分别。我们还评估了堆积质子的概率被标记在FD作为堆积的平均数的函数。然后提取LHC观测这一过程的灵敏度和多玻色子有效耦合的约束条件。所得到的预期限制显示出很好的改进,为8维四次耦合和竞争性的界限,6维异常三重耦合w.r.t目前的实验限制。因此,我们建议将这一过程作为研究多规范玻色子耦合的一个灵敏的补充通道,用于LHC实验。

英文摘要:

In this paper, we explore the potential of the LHC to measure the rate of $\mathrm{p}\mathrm{p}\rightarrow \mathrm{p}~ WWγ~\mathrm{p}$ process, also to probe the new effective couplings contributing to the $WWγ$ and $WWγγ$ vertices. The analysis is performed at the $\sqrt{s}=13$ TeV, in the di-leptonic decay channel, and assuming 300 $fb^{-1}$ integrated luminosity (IL). In addition to the presence of two opposite sign leptons, a photon, and missing energy, the distinctive signature of this process is the presence of two intact protons flying few millimeters from the initial beam direction in both sides of interaction points which suppress the background process effectively. To exploit this feature of signal we benefit from forward detectors (FDs) placed about 200 meters from the interaction point to register the kinematics of tagged protons. In order to overcome the major sources of backgrounds, we introduced three categories of selection cuts dealing with objects that strike the central detector, protons hitting the FDs, and correlations of central objects and protons, respectively. We also evaluate the probability of pile-up protons to be tagged in the FDs as a function of the mean number of pile-up. Then the sensitivity of the LHC to observe this process and constraints on multi-boson effective couplings are extracted. The obtained expected limits show very good improvements for dimension-8 quartic couplings and competitive bounds on dimension-6 anomalous triple couplings w.r.t the current experimental limits. Therefore, we propose this process to the LHC experiments as a sensitive and complementary channel to study the multi-gauge boson couplings.

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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