arXiv 2403.134452024-03hep-phhep-ex

改进Type-X双希格斯二重态模型场景中$hAA$耦合的探测：$\tau$-喷注重子电荷鉴别的关键作用

Improving probes of $hAA$ coupling in the Type-X two Higgs Doublet Model scenario: the crucial role of $τ$-jet charge identification

Biswarup Mukhopadhyaya, Sirshendu Samanta, Tousik Samui, Ritesh K. Singh

备注：: 23 pages, 2 figures

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AI总结：

本研究在Type-X双希格斯二重态模型中提出利用同号$\tau$-喷注与同号轻子事件探测$hAA$耦合，显著提升灵敏度，覆盖$m_A$至85 GeV，并大幅降低所需亮度。

摘要：

已发现的125-GeV标量玻色子的奇异衰变模式，即衰变为一对轻赝标量，是探测那些存在此类赝标量的新物理场景的良好探针。在赝标量（$A$）质量低于62.5 GeV的区域进行的搜索迄今未发现任何信号。目前尚无搜索检验$m_A > 62.5$ GeV的区域，在该区域，由于赝标量离壳，截面受到抑制。我们指出，在Type-X双希格斯二重态模型背景下，探测$hAA$耦合的灵敏度可能得到增强。我们聚焦于$h\to A A^{(*)} \to 4\tau$过程，并选择具有两个同号$\tau$-喷注以及一对同号轻子的事件。这比以往提出的通道能更有效地消除背景。考虑$\tau\tau A$耦合的两个取值，我们获得了在$m_A$高达85 GeV范围内，可在2$\sigma$和3$\sigma$显著性下探测的$hAA$耦合的限制。对于$m_A < 62.5$ GeV的情况，我们也发现通过我们建议的通道进行的探测相较于在LHC上进行的常规$2\mu 2\tau$搜索有显著改进。在该区域内，使用我们的策略在3000 fb$^{-1}$亮度下达到$\lambda_{hAA}$耦合的探测范围，若使用常规$2\mu 2\tau$搜索则需要约$3.6\times 10^{5}$ fb$^{-1}$的亮度。

英文摘要：

The exotic decay modes of the already discovered 125-GeV scalar into a pair of light pseudoscalars is a good probe of those new physics scenarios where such pseudoscalars exist. Searches in the mass region where the pseudoscalar ($A$) is lighter than 62.5 GeV have yielded null findings so far. No search has yet examined $m_A > 62.5$ GeV where the cross section is suppressed by the off-shell pseudoscalar. We point out a possible enhancement of the sensitivity of probing $hAA$ coupling in the context of a Type-X two Higgs doublet model. We focus on $h\to A A^{(*)} \to 4τ$, and select events with two same-sign $τ$-jets along with a pair of same-sign leptons. This enables much more effective background elimination than in the erstwhile proposed channels. Taking two values of the $ττA$ coupling into account, we obtain limits on the $hAA$ coupling that can be probed at 2$σ$ and 3$σ$ significance, for $m_A$ ranging up to 85 GeV. For $m_A < 62.5$ GeV, too, we find the probe through our suggested channel exhibits considerable improvement upon the usual $2μ2τ$-based searches conducted at the LHC. Within this region, achieving the reach of $λ_{hAA}$ coupling at 3000 fb$^{-1}$ luminosity using our strategy would require approximately $\sim$ 3.6$\times 10^{5}$ fb$^{-1}$ luminosity using conventional $2μ2τ$-based searches.

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