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arXiv 1503.08537hep-phhep-ex
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在LHC、ILC和100 TeV对撞机上通过CP破坏top-Higgs相互作用增强$t\bar{t}hh$的产生

Enhancing $t\bar{t}hh$ production through CP-violating top-Higgs interaction at the LHC, ILC and a 100 TeV collider

Ning Liu, Yanming Zhang, Jinzhong Han, Bingfang Yang

摘要:

希格斯粒子自耦合的测量是未来对撞机的重要物理目标之一。在LHC中,双Higgs产生是测量Higgs三线耦合的主要方法。作为对双Higgs产生的补充,$t \bar{t} hh$过程可能为在LHC和未来100 TeV的$pp$对撞机或高能$e^+e^-$对撞机上测量双Higgs物理开辟一条新的途径,因为额外的终态$t\bar t$可以有效地抑制本底。然而,这种过程也是由top-Higgs耦合控制的。在这项工作中,我们调查的CP破坏的top-Higgs耦合的$t\bar{t}hh$生产在LHC,ILC和100 TeV强子对撞机在当前的Higgs数据的影响。在2个$σ$ Higgs数据允许的参数范围内,我们发现LHC-14 TeV,ILC-1 TeV和VHE-LHC/SPPC-100 TeV的$t\bar{t}hh$的截面可以增强到SM预测的2.1倍。未来对Higgs耦合的精确测量将揭示top-Higgs相互作用的本质,并通过$t\bar{t}hh$的产生提高Higgs自耦合测定的灵敏度。

英文摘要:

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, $t \bar{t} hh$ 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 $t\bar t$ 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 $t\bar{t}hh$ production at the LHC, ILC and a 100 TeV hadron collider under the current Higgs data. Within 2$σ$ Higgs data allowed parameter region, we find that the cross section of $t\bar{t}hh$ at the LHC-14 TeV, ILC-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 $t\bar{t}hh$ production.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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