矢量玻色子散射过程$pp\rightarrow W^+W^+jjX\rightarrow \ell^+ν_\ell\ell^+ν_\ell jjX$的反常四次规范耦合和么正化
Anomalous quartic gauge couplings and unitarization for the vector boson scattering process $pp\rightarrow W^+W^+jjX\rightarrow \ell^+ν_\ell\ell^+ν_\ell jjX$
摘要：
LHC的弱矢量玻色子散射（VBS）提供了一个很好的信息来源，关于四次规范耦合的结构和电弱对称性破缺中SM之外物理学的可能影响。参数化偏离SM内的有效场论在树的水平，8维运营商，这是需要足够的一般建模，导致非物理增强截面内的LHC的可访问的能量范围。对表征VBS的$VVjj$事件的唯象研究需要保持么正性极限。在这里，我们开发了一个完整的离壳层VBS过程的数值么正化方案，并将其应用到同号$W$散射，即像$qq\to qqW^+W^+$的过程。该方案是在蒙特卡罗程序VBFNLO中实现的，包括弱玻色子的轻子衰变和NLO QCD修正。讨论了高维算子之间的分布区分。
英文摘要：
Weak vector boson scattering (VBS) at the LHC provides an excellent source of information on the structure of quartic gauge couplings and possible effects of physics beyond the SM in electroweak symmetry breaking. Parameterizing deviations from the SM within an effective field theory at tree level, the dimension-8 operators, which are needed for sufficiently general modeling, lead to unphysical enhancements of cross sections within the accessible energy range of the LHC. Preservation of unitarity limits is needed for phenomenological studies of the $VVjj$ events which signify VBS. Here we develop a numerical unitarization scheme for the full off-shell VBS processes and apply it to same-sign $W$ scattering, i.e. processes like $qq\to qqW^+W^+$. The scheme is implemented within the Monte Carlo program VBFNLO, including leptonic decay of the weak bosons and NLO QCD corrections. Distributions differentiating between higher dimensional operators are discussed.
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