Phenomenology of electroweak portal dark showers: high energy direct probes and low energy complementarity
Abstract We investigate the phenomenology of a dark QCD sector interacting with the Standard Model (SM) via the electroweak (EW) portals. The portal interactions allow SM bosons, such as Z and h, or additional bosons that mix with them, to decay into dark quarks, producing dark showers. The light da...
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2025-01-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP01(2025)149 |
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| author | Hsin-Chia Cheng Xu-Hui Jiang Lingfeng Li |
| author_facet | Hsin-Chia Cheng Xu-Hui Jiang Lingfeng Li |
| author_sort | Hsin-Chia Cheng |
| collection | DOAJ |
| description | Abstract We investigate the phenomenology of a dark QCD sector interacting with the Standard Model (SM) via the electroweak (EW) portals. The portal interactions allow SM bosons, such as Z and h, or additional bosons that mix with them, to decay into dark quarks, producing dark showers. The light dark mesons are expected to be long-lived particles (LLPs), as their decays back to the SM states through the EW-portal interactions typically have macroscopic decay lengths. We focus on dark shower events initiated by various bosons at the Large Hadron Collider (LHC). The most prominent signal is the displaced decay of GeV-scale dark pions as LLPs. Current limits on dark shower signals at LHC detectors are recast from public data to provide simplified limits insensitive to UV physics details. Future limits in the high-luminosity phase and proposed auxiliary detectors are also projected. Additionally, we study the flavor-changing neutral current (FCNC) B decays into dark pions, obtaining both current and projected constraints at the LHC and other facilities. These constraints can be combined for specific models, which are illustrated in two EW-portal benchmarks: one with the heavy doublet fermion mediation and another with the Z′ mediator including a mass mixing. The collider reach shows significant potential to probe the parameter space unconstrained by EW precision tests, highlighting the necessity of dedicated LLP search strategies and facilities. |
| format | Article |
| id | doaj-art-e5cc11a0d4a746c98cfb9b85b853462f |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-e5cc11a0d4a746c98cfb9b85b853462f2025-02-09T12:07:34ZengSpringerOpenJournal of High Energy Physics1029-84792025-01-012025114110.1007/JHEP01(2025)149Phenomenology of electroweak portal dark showers: high energy direct probes and low energy complementarityHsin-Chia Cheng0Xu-Hui Jiang1Lingfeng Li2Center for Quantum Mathematics and Physics (QMAP), Department of Physics, University of California, DavisCenter for High Energy Physics, Institute of High Energy Physics, Chinese Academy of SciencesDepartment of Physics, Brown UniversityAbstract We investigate the phenomenology of a dark QCD sector interacting with the Standard Model (SM) via the electroweak (EW) portals. The portal interactions allow SM bosons, such as Z and h, or additional bosons that mix with them, to decay into dark quarks, producing dark showers. The light dark mesons are expected to be long-lived particles (LLPs), as their decays back to the SM states through the EW-portal interactions typically have macroscopic decay lengths. We focus on dark shower events initiated by various bosons at the Large Hadron Collider (LHC). The most prominent signal is the displaced decay of GeV-scale dark pions as LLPs. Current limits on dark shower signals at LHC detectors are recast from public data to provide simplified limits insensitive to UV physics details. Future limits in the high-luminosity phase and proposed auxiliary detectors are also projected. Additionally, we study the flavor-changing neutral current (FCNC) B decays into dark pions, obtaining both current and projected constraints at the LHC and other facilities. These constraints can be combined for specific models, which are illustrated in two EW-portal benchmarks: one with the heavy doublet fermion mediation and another with the Z′ mediator including a mass mixing. The collider reach shows significant potential to probe the parameter space unconstrained by EW precision tests, highlighting the necessity of dedicated LLP search strategies and facilities.https://doi.org/10.1007/JHEP01(2025)149New Light ParticlesDark Matter at CollidersNew Gauge Interactions |
| spellingShingle | Hsin-Chia Cheng Xu-Hui Jiang Lingfeng Li Phenomenology of electroweak portal dark showers: high energy direct probes and low energy complementarity Journal of High Energy Physics New Light Particles Dark Matter at Colliders New Gauge Interactions |
| title | Phenomenology of electroweak portal dark showers: high energy direct probes and low energy complementarity |
| title_full | Phenomenology of electroweak portal dark showers: high energy direct probes and low energy complementarity |
| title_fullStr | Phenomenology of electroweak portal dark showers: high energy direct probes and low energy complementarity |
| title_full_unstemmed | Phenomenology of electroweak portal dark showers: high energy direct probes and low energy complementarity |
| title_short | Phenomenology of electroweak portal dark showers: high energy direct probes and low energy complementarity |
| title_sort | phenomenology of electroweak portal dark showers high energy direct probes and low energy complementarity |
| topic | New Light Particles Dark Matter at Colliders New Gauge Interactions |
| url | https://doi.org/10.1007/JHEP01(2025)149 |
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