从SSDL +2b测量值测量第t个耦合
Measuring the tth coupling from SSDL+2b measurements
摘要：
我们评估了在SSDL+2b通道中专门搜索tth生产的潜力。这样的测量提供了对顶部汤川耦合的直接访问，因为灵敏度不与环路级h-gamma-gamma或知之甚少的hbb耦合卷积，如当前tth搜索的情况。此外，可以通过考虑SSDL+2b速率与所进行的Wh -> WWW* 测量的速率的比率来降低对希格斯宽度的不确定性的敏感性。因此，SSDL通道可以主要依赖于已经良好测量的h->WW* 衰减。这项可行性研究需要开发一种新的计算“假”轻子的方法，这构成了我们搜索的主要背景。结合LHC 7、LHC 8和未来LHC 14的测量结果进行希格斯耦合拟合，将有助于解决汤川顶耦合和BSM对hgg耦合的贡献之间的任何剩余模糊性。
英文摘要：
We evaluate the potential of a dedicated search for tth production in the SSDL+2b channel. Such a measurement provides direct access to the top Yukawa coupling, since the sensitivity is not convolved with the loop-level h-gamma-gamma or poorly known hbb coupling, as is the case for present tth searches. Furthermore, susceptibility to uncertainties in the Higgs width can be reduced by considering a ratio of SSDL+2b rates with those of the performed Wh -> WWW* measurement. The SSDL channel can therefore rely primarily on the already well-measured h->WW* decay. This feasibility study required the development of a new calculation method for "fake" leptons, which constitute the dominant background to our search. Combining measurements from LHC7, LHC8 and in the future LHC14 for the Higgs coupling fit would help resolve any remaining ambiguity between the top Yukawa coupling and a BSM contribution to the hgg coupling.
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