Muon (g − 2) and thermal WIMP DM in U 1 L μ − L τ $$ \textrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ models
Abstract The U 1 L μ − L τ $$ \textrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ model is anomaly-free with the Standard Model (SM) fermion content, and can make substantial contributions to the muon (g − 2) at the level of ∆a μ ∼ O(10) × 10 −10 for M Z ′ $$ {M}_{Z^{\prime }} $$ ∼ O(10 − 100) MeV and g X ∼ (...
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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)014 |
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| author | Seungwon Baek Jongkuk Kim P. Ko |
| author_facet | Seungwon Baek Jongkuk Kim P. Ko |
| author_sort | Seungwon Baek |
| collection | DOAJ |
| description | Abstract The U 1 L μ − L τ $$ \textrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ model is anomaly-free with the Standard Model (SM) fermion content, and can make substantial contributions to the muon (g − 2) at the level of ∆a μ ∼ O(10) × 10 −10 for M Z ′ $$ {M}_{Z^{\prime }} $$ ∼ O(10 − 100) MeV and g X ∼ (4 − 8) × 10 −4. In this light Z′ region, it was claimed that the model can also incorporate thermal WIMP dark matter (DM) if M DM ∼ M Z ′ $$ {M}_{Z^{\prime }} $$ /2. This setup relies on DM particles annihilating into SM particles through a Z′-mediated s-channel. In this work, we show that this tight relationship between M Z ′ $$ {M}_{Z^{\prime }} $$ and M DM can be evaded or nullified both for scalar and spin-1/2 DM by considering the contributions from the dark Higgs boson (H 1). The dark Higgs boson plays an important role, not only because it gives mass to the dark photon but also because it introduces additional DM annihilation channels, including new final states such as H 1 H 1, Z′Z′, and Z′H 1. As a result, the model does not require a close mass correlation between the Z′ boson and dark matter M DM ~ M Z ′ $$ {M}_{Z^{\prime }} $$ /2 any longer, allowing for a broader range of mass possibilities for both scalar and fermionic dark matter types. We explore in great details various scenarios where the U(1) symmetry is either fully broken or partially remains as discrete symmetries, Z 2 or Z 3. This approach broadens the model’s capacity to accommodate various WIMP dark matter phenomena in the light Z′ region where the muon (g − 2) μ makes a sensitive probe of the model. |
| format | Article |
| id | doaj-art-7dfbaa35ff054318b30c2a0ddfd6ab16 |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | SpringerOpen |
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| series | Journal of High Energy Physics |
| spelling | doaj-art-7dfbaa35ff054318b30c2a0ddfd6ab162025-01-19T12:07:47ZengSpringerOpenJournal of High Energy Physics1029-84792025-01-012025112810.1007/JHEP01(2025)014Muon (g − 2) and thermal WIMP DM in U 1 L μ − L τ $$ \textrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ modelsSeungwon Baek0Jongkuk Kim1P. Ko2The Institute of Basic Science, Korea UniversitySchool of physics, Korea Institute for Advanced Study (KIAS)School of physics, Korea Institute for Advanced Study (KIAS)Abstract The U 1 L μ − L τ $$ \textrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ model is anomaly-free with the Standard Model (SM) fermion content, and can make substantial contributions to the muon (g − 2) at the level of ∆a μ ∼ O(10) × 10 −10 for M Z ′ $$ {M}_{Z^{\prime }} $$ ∼ O(10 − 100) MeV and g X ∼ (4 − 8) × 10 −4. In this light Z′ region, it was claimed that the model can also incorporate thermal WIMP dark matter (DM) if M DM ∼ M Z ′ $$ {M}_{Z^{\prime }} $$ /2. This setup relies on DM particles annihilating into SM particles through a Z′-mediated s-channel. In this work, we show that this tight relationship between M Z ′ $$ {M}_{Z^{\prime }} $$ and M DM can be evaded or nullified both for scalar and spin-1/2 DM by considering the contributions from the dark Higgs boson (H 1). The dark Higgs boson plays an important role, not only because it gives mass to the dark photon but also because it introduces additional DM annihilation channels, including new final states such as H 1 H 1, Z′Z′, and Z′H 1. As a result, the model does not require a close mass correlation between the Z′ boson and dark matter M DM ~ M Z ′ $$ {M}_{Z^{\prime }} $$ /2 any longer, allowing for a broader range of mass possibilities for both scalar and fermionic dark matter types. We explore in great details various scenarios where the U(1) symmetry is either fully broken or partially remains as discrete symmetries, Z 2 or Z 3. This approach broadens the model’s capacity to accommodate various WIMP dark matter phenomena in the light Z′ region where the muon (g − 2) μ makes a sensitive probe of the model.https://doi.org/10.1007/JHEP01(2025)014Models for Dark MatterNew Gauge InteractionsParticle Nature of Dark Matter |
| spellingShingle | Seungwon Baek Jongkuk Kim P. Ko Muon (g − 2) and thermal WIMP DM in U 1 L μ − L τ $$ \textrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ models Journal of High Energy Physics Models for Dark Matter New Gauge Interactions Particle Nature of Dark Matter |
| title | Muon (g − 2) and thermal WIMP DM in U 1 L μ − L τ $$ \textrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ models |
| title_full | Muon (g − 2) and thermal WIMP DM in U 1 L μ − L τ $$ \textrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ models |
| title_fullStr | Muon (g − 2) and thermal WIMP DM in U 1 L μ − L τ $$ \textrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ models |
| title_full_unstemmed | Muon (g − 2) and thermal WIMP DM in U 1 L μ − L τ $$ \textrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ models |
| title_short | Muon (g − 2) and thermal WIMP DM in U 1 L μ − L τ $$ \textrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ models |
| title_sort | muon g 2 and thermal wimp dm in u 1 l μ l τ textrm u 1 l mu l tau models |
| topic | Models for Dark Matter New Gauge Interactions Particle Nature of Dark Matter |
| url | https://doi.org/10.1007/JHEP01(2025)014 |
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