Enhancing $tar{t}hh$ production through CP-violating top-Higgs interaction at the LHC and future colliders

Liu Ning; Zhang Yan-Min; Han Jin-Zhong; Yang Bing-Fang

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Enhancing $tar{t}hh$ production through CP-violating top-Higgs interaction at the LHC and future colliders

Liu Ning 1 * #,Zhang Yan-Min 1,Han Jin-Zhong 2,Yang Bing-Fang 1

1.Institute of Theoretical Physics, Henan Normal University, Xinxiang 45300

2.School of Physics and Electromechnical Engineering, Zhoukou Normal University, Zhoukou, 466001

*Correspondence author

#Submitted by

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Funding: the Startup Foundation for Doctors of Henan Normal University under contract(11112); the China Postdoctoral Science Foundation (2014M56198（No.U1404113）, China Postdoctoral Science Foundation（No.2014M561987）, Specialized Research Fund for Doctoral Program of Higher Education（No.20134104120002）, National Natural Science Foundation of China （No.11275057,11305049,11405047）

Opened online:23 May 2017

Accepted by: none

Citation: Liu Ning,Zhang Yan-Min,Han Jin-Zhong.Enhancing $tar{t}hh$ production through CP-violating top-Higgs interaction at the LHC and future colliders[OL]. [23 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4732370

The measurement of Higgs self-coupling is one of the most crucial physics goals at the future colliders. At the LHC, the di-Higgs production is a main way to measure the Higgs trilinear coupling. As a complementary to the di-Higgs production, $t ar{t} hh$ process may open a new avenue to measure di-Higgs physics at the LHC and a future 100 TeV $pp$ collider or a high energy $e^+e^-$ collider since the extra $tar t$ in the final states may efficiently suppress the backgrounds. However, such a kind of process is also controlled by the top-Higgs coupling. In this work, we investigate the impact of CP-violating top-Higgs coupling on production at the LHC, $e^+e^-$ and a 100 TeV hadron collider under the current Higgs data. Within Higgs data allowed parameter region, we find that the cross section of $tar{t}hh$ at the LHC-14 TeV, $e^+e^-$-1 TeV and VHE-LHC/SPPC-100 TeV can be enhanced up to 2.1 times the SM predictions. The future precise measurement of Higgs coupling will reveal the nature of top-Higgs interaction and improve the sensitivity of the determination of Higgs self-coupling through $tar{t}hh$ production.

Keywords:Higgs self-coupling; Top quark; CP-Violating

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