论文标题
使用前向质子标记将量规玻色子耦合固定在$wwγ$中
Pinning down the gauge boson couplings in $WWγ$ production using forward proton tagging
论文作者
论文摘要
在本文中,我们探讨了LHC测量$ \ mathrm {p} \ Mathrm {p} \ rightArrow \ Mathrm {p} 〜WWγ〜 \ Mathrm {p} $ process的速率的潜力,还可以探测为新的有效量贡献$wwγ$和$wwγ$ www的新有效couplings。该分析在$ \ sqrt {s} = 13 $ tev上进行,在di-leptonic衰减通道中,并假设300 $ fb^{ - 1} $集成的光度(IL)。除了存在两个相反的灯笼,一个光子和缺失的能量外,此过程的独特特征是存在两个完整的质子,在相互作用点的两侧,从初始梁方向飞出几毫米,从而有效地抑制了背景过程。为了利用信号的这一功能,我们受益于从交互点约200米处的前向检测器(FDS)来注册标记质子的运动学。为了克服背景的主要来源,我们引入了三类选择削减的选择,这些选择削减了撞击中心检测器,质子击中FD的对象以及中央对象和质子的相关性。我们还评估了堆积质子在FD中的堆积质子的概率,这是平均堆积量的函数。然后,提取了LHC观察此过程和对多个玻色子有效耦合的约束的敏感性。所获得的预期限制显示了维度8四分位数耦合的良好改进,并且在尺寸6异常三联耦合W.R.T上的竞争界限W.R.T当前的实验限制。因此,我们将这一过程提出了LHC实验,作为研究多规模玻色子耦合的敏感和互补通道。
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.