论文标题
研究异常仪玻色子自偶联的研究和旋转的作用-1 $极化
Study of anomalous gauge boson self-couplings and the role of spin-$1$ polarizations
论文作者
论文摘要
本文的主要目的是研究异常的仪表玻色子自耦合，尤其是三重规玻色子耦合，借助于孔极化的旋转极化可观察到的旋转极化可观察到，在可能的情况下，在梁极化的情况下。中性三重量规玻色子耦合，即$ zzz $，$zzγ$，$zγγ$，以$ zz/zγ$（$ 2LQ \ bar {q}/2lγ$）的生产进行了$ e^+e^+e^+e^ - $ collider，均为$ e^+e^ - $ collider，nceclider and Inthing Beam偏振。这些异常耦合中的一些也在LHC的$ ZZ $（$ 4L $）生产中进行了研究。在电荷领域，已经在$ e^+e^ - $ collider中研究了$ wwz $的异常仪表玻色子耦合，$ wwz $，$ w+e^ - collider in $ w^+w^ - $（$ l^ - \ bar {ν_l} Q^\ bar bar {q} $）的生产。 $ wwz $异常的耦合还以$ zw^\ pm $生产为$ 3L $ +缺少$ e_t $ channel。 $ E^+$ - $ e^ - $ collider的所有分析均已针对$ 500 $ GEV的质量（CM）Energy进行，$ 100 $ fb $^{ - 1} $的集成光度。 LHC的分析以$ 13 $ $ pp $ collisions的$ 13 $ TEV CM Energy进行。在每个过程中，使用Markov-Chain--Monte-Carlo（MCMC）方法，使用横截面和极化不对称以及其他不对称性（前向，方位角）在异常耦合上同时获得限制。两极分化的不对称可以区分$ cp $ - -EVEN和$ CP $ -ODD耦合，并有助于对耦合施加更严格的约束。在$ e^+e^ - collider的情况下，初始$ e^ - $和$ e^+$ beam的极化用于增加信号与背景比率，对异常耦合施加更严格的约束。如果观察到与SM的偏差，则极化不对称在异常耦合的测量中具有重要作用。
The prime goal of this thesis is to study anomalous gauge boson self couplings, triple gauge boson couplings in particular, with the help of spin polarization observables of the gauge bosons $Z$ and $W^\pm$ in the presence of beam polarizations where ever possible. The neutral triple gauge boson couplings, i.e., $ZZZ$, $ZZγ$, $Zγγ$, are studied in $ZZ/Zγ$ ($2lq\bar{q}/2lγ$) production at an $e^+e^-$ collider with and without beam polarization. Some of these anomalous couplings are also studied in $ZZ$ ($4l$) production at the LHC. In the charge sector the anomalous gauge boson couplings, i.e., $WWZ$, $WWγ$ have been studied at an $e^+e^-$ collider in $W^+W^-$ ($l^-\bar{ν_l}q^\prime\bar{q}$) production. The $WWZ$ anomalous couplings are also studied in $ZW^\pm$ production at LHC in $3l$ + missing $E_T$ channel. All the analyses at an $e^+$-$e^-$ collider have been performed for center-of-mass (CM) energy of $500$ GeV and integrated luminosity of $100$ fb$^{-1}$. The analyses at the LHC are performed at $13$ TeV CM energy of $pp$ collisions. The cross sections and polarization asymmetries, along with other asymmetries (forward-backward, azimuthal), are used to obtain simultaneous limits on the anomalous couplings using Markov-Chain--Monte-Carlo (MCMC) method in each process. The polarization asymmetries can distinguish between $CP$-even and $CP$-odd couplings and help to put tighter constraints on the couplings. The polarization of the initial $e^-$ and $e^+$ beam, in case of $e^+e^-$ collider, are used to increase the signal to background ratio, putting tighter constraints on the anomalous couplings. The polarization asymmetries are instrumental in the measurement of anomalous couplings should a deviation from the SM be observed.
