Srutinizing the Higgs signal and background in the 2e2μ golden channel
Srutinizing the Higgs signal and background in the 2e2μ golden channel
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DOI：
10.1007/jhep01(2013)182
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发表时间：
2013-01-01
影响因子：
5.4
通讯作者：
Vega-Morales, Roberto
中科院分区：
文献类型：
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作者：
Chen, Yi;Nhan Tran;Vega-Morales, Roberto
新发现的四轻子共振衰变中的运动分布是对其与电弱规范玻色子耦合的张量结构的有力探测。我们给出了“黄金通道”e(+)e(-)mu(+)mu（-）最终状态的全微分截面的信号和背景的解析计算。我们包括中间规范玻色子之间的所有干涉效应，并允许它们在壳上或壳外。对于信号，我们计算一般标量耦合到ZZ， gamma和Z的完全微分衰减宽度。作为背景，我们计算了q (q) / bar湮灭到Z和伽玛规范玻色子的阶全微分截面，包括共振Z - bbb222mu过程的贡献。我们还提出了单微分投影和双微分投影，并研究了干涉对微分光谱的影响。这些表达式可以用多种方式来揭示新发现的共振的性质，或者未来可能发现的任何衰变成中性规范玻色子的新标量的性质。
Kinematic distributions in the decays of the newly discovered resonance to four leptons are a powerful probe of the tensor structure of its couplings to electroweak gauge bosons. We present analytic calculations for both signal and background of the fully differential cross section for the 'Golden Channel' e(+)e(-)mu(+)mu(-) final state. We include all interference effects between intermediate gauge bosons and allow them to be on- or off-shell. For the signal we compute the fully differential decay width for general scalar couplings to ZZ, gamma gamma, and Z gamma. For the background we compute the leading order fully differential cross section for q (q) over bar annihilation into Z and gamma gauge bosons, including the contribution from the resonant Z -> 2e2 mu process. We also present singly and doubly differential projections and study the interference effects on the differential spectra. These expressions can be used in a variety of ways to uncover the nature of the newly discovered resonance or any new scalars decaying to neutral gauge bosons which might be discovered in the future.