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Semivisible dark photon phenomenology at the GeV scale
In rich dark sector models, dark photons heavier than tens of MeV can behave as semi-visible particles: their decays contain both visible and invisible final states. We present models containing multiple dark fermions which allow for such decays and inscribe them in the context of inelastic dark mat...
Autores principales: | , , , |
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Lenguaje: | eng |
Publicado: |
2023
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1103/PhysRevD.108.015032 http://cds.cern.ch/record/2848795 |
_version_ | 1780976864846675968 |
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author | Abdullahi, Asli M. Hostert, Matheus Massaro, Daniele Pascoli, Silvia |
author_facet | Abdullahi, Asli M. Hostert, Matheus Massaro, Daniele Pascoli, Silvia |
author_sort | Abdullahi, Asli M. |
collection | CERN |
description | In rich dark sector models, dark photons heavier than tens of MeV can behave as semi-visible particles: their decays contain both visible and invisible final states. We present models containing multiple dark fermions which allow for such decays and inscribe them in the context of inelastic dark matter and heavy neutral leptons scenarios. Our models represent a generalization of the traditional inelastic dark matter model by means of a charge conjugation symmetry. We revisit constraints on dark photons from $e^+e^-$ colliders and fixed target experiments, including the effect of analysis vetoes on semi-visible decays, $A^\prime \to \psi_i (\psi_j \to \psi_k \ell^+\ell^-)$. We find that in some cases, the BaBar and NA64 experiments no longer exclude large kinetic mixing, $\varepsilon \sim 10^{-2}$, and, specifically, the related explanation of the discrepancy in the muon $(g-2)$. This reopens an interesting window in parameter space for dark photons with exciting discovery prospects. We point out that a modified missing-energy search at NA64 can target short-lived $A^\prime$ decays and directly probe the newly-open parameter space. |
id | cern-2848795 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2023 |
record_format | invenio |
spelling | cern-28487952023-10-02T04:38:24Zdoi:10.1103/PhysRevD.108.015032http://cds.cern.ch/record/2848795engAbdullahi, Asli M.Hostert, MatheusMassaro, DanielePascoli, SilviaSemivisible dark photon phenomenology at the GeV scalehep-exParticle Physics - Experimenthep-phParticle Physics - PhenomenologyIn rich dark sector models, dark photons heavier than tens of MeV can behave as semi-visible particles: their decays contain both visible and invisible final states. We present models containing multiple dark fermions which allow for such decays and inscribe them in the context of inelastic dark matter and heavy neutral leptons scenarios. Our models represent a generalization of the traditional inelastic dark matter model by means of a charge conjugation symmetry. We revisit constraints on dark photons from $e^+e^-$ colliders and fixed target experiments, including the effect of analysis vetoes on semi-visible decays, $A^\prime \to \psi_i (\psi_j \to \psi_k \ell^+\ell^-)$. We find that in some cases, the BaBar and NA64 experiments no longer exclude large kinetic mixing, $\varepsilon \sim 10^{-2}$, and, specifically, the related explanation of the discrepancy in the muon $(g-2)$. This reopens an interesting window in parameter space for dark photons with exciting discovery prospects. We point out that a modified missing-energy search at NA64 can target short-lived $A^\prime$ decays and directly probe the newly-open parameter space.In rich dark sector models, dark photons heavier than tens of MeV can behave as semivisible particles; their decays contain both visible and invisible final states. We present models containing multiple dark fermions which allow for such decays and inscribe them in the context of inelastic dark matter and heavy neutral leptons scenarios. Our models represent a generalization of the traditional inelastic dark matter model by means of a charge conjugation symmetry. We revisit constraints on dark photons from <math display="inline"><msup><mi>e</mi><mo>+</mo></msup><msup><mi>e</mi><mo>-</mo></msup></math> colliders and fixed-target experiments, including the effect of analysis vetoes on semivisible decays, <math display="inline"><msup><mi>A</mi><mo>′</mo></msup><mo stretchy="false">→</mo><msub><mi>ψ</mi><mi>i</mi></msub><mo stretchy="false">(</mo><msub><mi>ψ</mi><mi>j</mi></msub><mo stretchy="false">→</mo><msub><mi>ψ</mi><mi>k</mi></msub><msup><mo>ℓ</mo><mo>+</mo></msup><msup><mo>ℓ</mo><mo>-</mo></msup><mo stretchy="false">)</mo></math>. We find that in some cases the BABAR and NA64 experiments no longer exclude large kinetic mixing, <math display="inline"><mi>ε</mi><mo>∼</mo><msup><mn>10</mn><mrow><mo>-</mo><mn>2</mn></mrow></msup></math>, and, specifically, the related explanation of the discrepancy in the muon (<math display="inline"><mrow><mi>g</mi><mo>-</mo><mn>2</mn></mrow></math>). This reopens an interesting window in parameter space for dark photons with exciting discovery prospects. We point out that a modified missing-energy search at NA64 can target short-lived <math display="inline"><msup><mi>A</mi><mo>′</mo></msup></math> decays and directly probe the newly-open parameter space.arXiv:2302.05410CERN-TH-2023-019FERMILAB-PUB-23-054-TIRMP-CP3-23-08oai:cds.cern.ch:28487952023-02-10 |
spellingShingle | hep-ex Particle Physics - Experiment hep-ph Particle Physics - Phenomenology Abdullahi, Asli M. Hostert, Matheus Massaro, Daniele Pascoli, Silvia Semivisible dark photon phenomenology at the GeV scale |
title | Semivisible dark photon phenomenology at the GeV scale |
title_full | Semivisible dark photon phenomenology at the GeV scale |
title_fullStr | Semivisible dark photon phenomenology at the GeV scale |
title_full_unstemmed | Semivisible dark photon phenomenology at the GeV scale |
title_short | Semivisible dark photon phenomenology at the GeV scale |
title_sort | semivisible dark photon phenomenology at the gev scale |
topic | hep-ex Particle Physics - Experiment hep-ph Particle Physics - Phenomenology |
url | https://dx.doi.org/10.1103/PhysRevD.108.015032 http://cds.cern.ch/record/2848795 |
work_keys_str_mv | AT abdullahiaslim semivisibledarkphotonphenomenologyatthegevscale AT hostertmatheus semivisibledarkphotonphenomenologyatthegevscale AT massarodaniele semivisibledarkphotonphenomenologyatthegevscale AT pascolisilvia semivisibledarkphotonphenomenologyatthegevscale |