Phenomenology of the Massive Dark Photon

Fabbrichesi, Marco; Gabrielli, Emidio; Lanfranchi, G.

doi:10.1007/978-3-030-62519-1_3

Cited by 2 publications

(3 citation statements)

References 82 publications

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“…This representative model is consistent with the hypothesis of DM thermal origin, provided that the model parameters lie in a constrained region. This provides a target for discovery or falsifiability -the so called "thermal target" [3]. To date, the most stringent exclusion limits in the vector-mediated LDM parameter space have been set by experiments at accelerators and colliders.…”

Section: Introductionmentioning

confidence: 99%

Probing the Dark Sector with NA64 and POKER at CERN SPS

Marsicano

2024

Proceedings of 1st General Meeting and 1st Training School of the COST Action COSMIC WSIPers — PoS(COSMICWISPers)

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Despite its great successes, the Standard Model (SM) of particle physics is far from complete, as suggested by many facts, such as the astrophysical evidences of Dark Matter, the baryon asymmetry observed in the universe and the unsolved problem of the origin of the neutrino masses. The search for DM, in particular, is one of the hottest topics of modern physics. Despite the various astrophysical and cosmological observations proving its existence, its particle properties remain to date unknown. In a theoretically motivated and largely unexplored scenario, DM could interact with the SM through a new force, mediated by a new vector boson (dark photon or 𝐴 ′ ), kinetically mixed with the SM photon. The NA64-𝑒 experiment at CERN aims to produce DM particles using the 100 GeV SPS electron beam impinging on a thick electromagnetic calorimeter. The DM production signature consists in a large observed missing energy, defined as the difference between the energy of the 100 GeV primary electron and the energy deposited in the calorimeter, coupled with no activity in the downstream veto systems. NA64-𝑒 its a versatile experiment, featuring a significant sensitivity to several beyond SM extensions involving new feebly interacting particles, as proved by the exclusion limits set by the NA64 collaboration in the ALPs and 𝐿 𝜇 − 𝐿 𝜏 scenarios. In the last years, the collaboration has performed preliminary studies with the aim to run the experiment with a positron beam, in order to exploit the potential of the 𝑒 + − 𝑒 − resonant annihilation for the 𝐴 ′ search, according with the ERC-funded POKER (POsitron resonant annihilation into darK mattER) project. This work presents the latest NA64-𝑒 results and its future prospects, reporting the sensitivity of the experiment to different theoretical scenarios. Finally, the progresses and prospects of the POKER project are presented.1st General Meeting and 1st Training School of the COST Action COSMIC WSIPers (COSMICWISPers)

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Section: Introductionmentioning

confidence: 99%

Probing the Dark Sector with NA64 and POKER at CERN SPS

Marsicano

2024

Proceedings of 1st General Meeting and 1st Training School of the COST Action COSMIC WSIPers — PoS(COSMICWISPers)

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“…An effective coupling between the SM and the Dark Sector particles is generated by a kinetic mixing between the 𝐴 ′ and the SM photon [4]. Such a theory can be described by the effective Lagrangian given below [5]:…”

Section: Introductionmentioning

confidence: 99%

“…In conclusion, although the LDM parameters are unknown, the additional thermal origin hypothesis provides an indication for them. In particular, if one assumes that the current DM density results from a thermal relic abundance in the early universe, it is possible to constrain the LDM parameter space, identifying a specific region of parameters and providing a concrete experimental target, known as "thermal target" [5].…”

Section: Introductionmentioning

confidence: 99%

The NA64-e experiment at CERN

Bisio

2024

Proceedings of 8th Symposium on Prospects in the Physics of Discrete Symmetries — PoS(DISCRETE2022)

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One of the most compelling arguments motivating the search for physics beyond the Standard Model (SM) is the need to explain the nature of Dark Matter (DM). Despite an extensive experimental program that combined direct, indirect, and detection at colliders, to date, no conclusive results about DM particle nature have been determined. Among the DM models, those predicting DM particles in the sub-GeV mass range (also called Light Dark Matter or LDM) represent a theoretically well-grounded option if a new DM-SM interaction is introduced. A simple hypothesis considers a new feeble force transmitted by a vector boson 𝐴 ′ (called Dark Photon), kinetically mixed with the ordinary photon. In this scenario, the 𝐴 ′ can be generated in the SM interactions of charged particles and subsequently decays either into SM or LDM particles. The NA64-e experiment at CERN exploits the 100 GeV SPS electron beam impinging on a thick active target focusing mostly on the production and detection of the 𝐴 ′ to LDM decay. If an 𝐴 ′ is produced in the target, the LDM daughter particles leave the detector carrying away a significant amount of energy, resulting in a missing energy event. To date, NA64-e has collected 2.84 × 10 11 electrons on target. No events with missing energy greater than 50 GeV and no activity within the veto systems were observed. These results allowed the collaboration to set the most competitive limits in the LDM parameter space.8th Symposium on Prospects in the Physics of Discrete Symmetries (DISCRETE 2022

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Phenomenology of the Massive Dark Photon

Cited by 2 publications

References 82 publications

Probing the Dark Sector with NA64 and POKER at CERN SPS

Probing the Dark Sector with NA64 and POKER at CERN SPS

The NA64-e experiment at CERN

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