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轻电荷希格斯玻色子在替代左右对称模型中的消失轨迹信号

Disappearing Track Signals from a Light Charged Higgs in the Alternative Left-Right Model

Indian Institute of Technology Guwahati（印度理工学院古瓦哈提分校）；University of Hyderabad（海得拉巴大学）；St. Joseph’s University（圣约瑟夫大学）

Hrishikesh Deka, Avnish, Poulose Poulose

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28 pages, 29 figures
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AI总结：

研究轻电荷希格斯玻色子在替代左右对称模型中的消失轨迹信号，探讨其在暗物质领域的潜在作用及实验探测可能性。

摘要：

我们研究了在替代左右对称模型（ALRM）框架下轻电荷希格斯玻色子的现象学。在这个模型中，由于非传统的费米子谱，在右旋上型夸克与奇异下型夸克配对而不是标准模型下型夸克，从而避免了树级的味改变中性流。此外，全球U(1)_S对称性的特定分配以及由此产生的R对称性防止了右旋和左旋电荷规范玻色子W_R和W_L之间的混合，从而进一步抑制了味违反效应。ALRM可以容纳潜在可行的暗物质候选者，包括费米子和标量。在此背景下，一个关联的电荷希格斯态H_2^±属于暗物质领域，可以自然获得亚茶伏到茶伏量级的质量，而不会与任何实验限制冲突。我们关注H_2^±由于与暗物质候选者质量分裂为亚GeV的情况下的长寿命粒子场景。我们确定了与观测到的暗物质 relic 密度和其他实验限制一致的参数空间区域。对消失轨迹信号进行了详细分析，包括现实的轨迹重建效率，并将现有的ATLAS搜索重新解释以评估当前限制和未来灵敏度。我们发现HL-LHC在这一场景下对茶伏量级电荷希格斯玻色子的灵敏度有限，而27 TeV HE-LHC可以有效探测相关的参数空间，100 TeV对撞机则提供显著增强的发现潜力。

英文摘要：

We study the phenomenology of a light charged Higgs boson in the framework of the Alternative Left--Right Symmetric Model (ALRM). In this model, stringent flavor constraints are evaded due to a non-conventional fermion spectrum in which the right-handed up-type quarks are paired with the exotic down-type quarks rather than the Standard Model down-type quarks, leading to the absence of tree-level flavor-changing neutral currents. Furthermore, a specific assignment of the global $U(1)_S$ symmetry and the resulting emergent $R$-parity prevent mixing between the right- and left-handed charged gauge bosons, $W_R$ and $W_L$, providing additional suppression of flavor-violating effects. The ALRM accommodates potentially viable dark matter candidates, both fermionic and scalar ones. In this context, an associated charged Higgs state, $H_2^\pm$, belonging to the dark sector can naturally acquire a sub-TeV to TeV-scale mass without conflicting with any experimental constraints. We focus on scenarios in which $H_2^\pm$ behaves as a long-lived particle due to a sub-GeV mass splitting with the dark matter candidate. We identify regions of parameter space consistent with the observed dark matter relic density and other experimental constraints. A detailed analysis of disappearing track signatures is performed, including realistic tracklet reconstruction efficiencies, and the existing ATLAS search are recast to assess the current limits and future sensitivities. We find that the HL-LHC has limited sensitivity to TeV-scale charged Higgs bosons in this scenario, while the 27 TeV HE-LHC can effectively probe the relevant parameter space, with a 100 TeV collider offering substantially enhanced discovery potential.

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