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arXiv 2212.06186hep-ph
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FASER 中的轻标量粒子

Light Scalars at FASER

Shuailong Li, Huayang Song, Shufang Su, Wei Su

AI总结:

本文建立轻 CP 偶/奇标量产生与衰变的模型无关形式体系,并以 I 型双 Higgs 二重态模型为例,证明 FASER 与 FASER 2 可探测大 tanβ 区域内的长寿命轻标量参数空间。

摘要:

FASER(ForwArd Search ExpeRiment,前向搜索实验)是目前正在大型强子对撞机(LHC)上运行的实验,能够探测在 LHC 相互作用点前向区域产生的轻质量长寿命粒子。本文研究了在 FASER 和 FASER 2 上探测轻的 CP 偶和 CP 奇标量粒子的前景。我们采用一个模型无关框架,通过有效拉格朗日量中的耦合修正因子记号来描述 CP 偶或 CP 奇标量粒子与标准模型(SM)粒子之间最一般的相互作用,并建立了标量粒子产生和衰变的通用形式体系。随后,以 Type-I two Higgs double model(I 型双 Higgs 二重态模型)的大 tanβ 区域为案例,分析了 FASER 和 FASER 2 对轻标量粒子的探测能力,该区域可容纳具有较长寿命的轻标量粒子。在所考虑的两个基准情景中,轻(赝)标量粒子的衰变长度在 10^-8 至 10^5 米之间变化。FASER 和 FASER 2 均能探测大 tanβ 区域中直至 tanβ≈10^5 的大部分参数空间,并将覆盖范围扩展到其他现有实验约束之外。

英文摘要:

FASER, the ForwArd Search ExpeRiment, is a currently operating experiment at the Large Hadron Collider (LHC) that can detect light long-lived particles produced in the forward region of the LHC interacting point. In this paper, we study the prospect of detecting light CP-even and CP-odd scalars at FASER and FASER 2. Considering a model-independent framework describing the most general interactions between a CP-even or CP-odd scalar and SM particles using the notation of coupling modifiers in the effective Lagrangian, we develop the general formalism for the scalar production and decay. We then analyze the FASER and FASER 2 reaches of light scalars in the large $\tanβ$ region of the Type-I two Higgs double model as a case study, in which light scalars with relatively long lifetime could be accommodated. In the two benchmark scenarios we considered, the light (pseudo)scalar decay length varies in $(10^{-8}, 10^5)$ meters. Both FASER and FASER 2 can probe a large part of the parameter space in the large $\tanβ$ region up to $10^5$, extending beyond the constraints of the other existing experiments.

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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