scholarly journals DARK FORCES SEARCHES IN FIXED TARGET EXPERIMENTS

2014 ◽  
Vol 35 ◽  
pp. 1460392
Author(s):  
M. BATTAGLIERI
Keyword(s):  
Nuclear Physics ◽  
Electromagnetic Current ◽  
Beyond The Standard Model ◽  
Fixed Target ◽  
Accelerator Facility ◽  
Fixed Target Experiments ◽  
Jefferson Lab ◽  
Hidden Sector ◽  
The Standard Model ◽  
Massive Boson

Searches for physics Beyond the Standard Model (BSM) can be carried out with precise and GeV-energy-range experiments. In many string theories, a Hidden Sector, decoupled to the SM, foresees the existence of a new massive boson, the A′ or heavy photon, that weakly couples to the electromagnetic current. A new particle with mass in the range of 1 MeV - 1 GeV could explain many astro-particle observations (e.g. positron excess seen by PAMELA and AMS experiments) and some anomalies not yet fully understood (e.g. muon g - 2 factor). The search for A′ has motivated intense experimental activities in almost every accelerator facility using different techniques: colliding beam, fixed target experiments, meson rare decays. Jefferson Lab, a world-leading nuclear physics laboratory, is planning a set of fixed target experiments aiming to discover the A′ or set new limits in its mass and coupling, with an unprecedented sensitivity and reach capability. In this contribution, after reviewing the physics case and some experimental evidences, I will report on the program of measurements planned at Jefferson Lab for the next years.

Review on Higgs Hidden-Dark Sector Physics

2021 ◽  
Author(s):  
Theodota Lagouri
Keyword(s):  
Standard Model ◽  
Weak Interactions ◽  
Hadron Collider ◽  
High Energy ◽  
Beyond The Standard Model ◽  
Future Prospects ◽  
Dark Sector ◽  
Hidden Sector ◽  
The Standard Model ◽  
The Universe

Abstract The Standard Model (SM), while extremely powerful as a description of the strong, electromagnetic and weak interactions, does not provide a natural candidate to explain Dark Matter (DM). Theoretical as well as experimental motivation exists for the existence of a hidden or dark sector of phenomena that couples either weakly or in a special way to SM fields. Hidden sector or dark sector states appear in many extensions to SM to provide a particular candidate DM in the universe or to explain astrophysical observations. If there is such a family of Beyond the Standard Model (BSM) particles and interactions, they may be accessible experimentally at the Large Hadron Collider (LHC) at CERN and at future High Energy Colliders. In this paper, the main focus is given on selected searches conducted at LHC experiments related to Higgs Hidden-Dark Sector Physics. The current constraints and future prospects of these studies are summarized.

scholarly journals Neutrinoless Double-Beta Decay: Status and Prospects

2019 ◽  
Vol 69 (1) ◽  
pp. 219-251 ◽  
Author(s):  
Michelle J. Dolinski ◽  
Alan W.P. Poon ◽  
Werner Rodejohann
Keyword(s):  
Beta Decay ◽  
Half Life ◽  
Particle Physics ◽  
Nuclear Physics ◽  
Large Scale ◽  
Neutrinoless Double Beta Decay ◽  
Lepton Number ◽  
Double Beta Decay ◽  
Beyond The Standard Model ◽  
The Standard Model

Neutrinoless double-beta decay is a forbidden, lepton-number-violating nuclear transition whose observation would have fundamental implications for neutrino physics, theories beyond the Standard Model, and cosmology. In this review, we summarize the theoretical progress to understand this process, the expectations and implications under various particle physics models, and the nuclear physics challenges that affect the precise predictions of the decay half-life. We also provide a synopsis of the current and future large-scale experiments that aim to discover this process in physically well-motivated half-life ranges.

scholarly journals Search for K+ → π+νν̅ at NA62

2018 ◽  
Vol 182 ◽  
pp. 02002
Author(s):  
Riccardo Aliberti
Keyword(s):  
Standard Model ◽  
Rare Decay ◽  
New Physics ◽  
Energy Scale ◽  
Beyond The Standard Model ◽  
Fixed Target ◽  
The Standard Model ◽  
Target Experiment ◽  
Flavour Physics ◽  
Fixed Target Experiment

Flavour physics is one of the most powerful fields for the search of new physics beyond the Standard Model. The kaon sector with the rare decay K+ → π+νν̅ provides one of the cleanest and most promising channels. NA62, a fixed target experiment at the CERN SPS, aims to measure BR (K+ → π+νν̅) with 10% precision to test the Standard Model validity up to an energy scale of hundreds of TeV. NA62 had dedicated data taking for the K+ → π+νν̅ measurement in 2016 and 2017 and will continue in 2018. Here preliminary results on a fraction of 2016 dataset are presented. The analysis of the complete 2016 data sample is expected to achieve the SM sensitivity.

scholarly journals Recent Progress in Search for Dark Sector Signatures

Open Physics ◽  
2016 ◽  
Vol 14 (1) ◽  
pp. 281-303 ◽  
Author(s):  
Maksym Deliyergiyev
Keyword(s):  
New Physics ◽  
Mass Scale ◽  
Beyond The Standard Model ◽  
Dark Sector ◽  
Hidden Sector ◽  
High Energies ◽  
Systematic Uncertainties ◽  
The Standard Model ◽  
History Of ◽  
The Universe

AbstractMany difficulties are encountered when attempting to pinpoint a common origin for several observed astrophysical anomalies, and when assessing their tension with existing exclusion limits. These include systematic uncertainties affecting the operation of the detectors, our knowledge of their response, astrophysical uncertainties, and the broad range of particle couplings that can mediate interaction with a detector target. Particularly interesting astrophysical evidence has motivated a search for dark-photon, and focused our attention on a Hidden Valleys model with a GeV-scale dark sector that produces exciting signatures. Results from recent underground experiments are also considered.There is a ‘light’ hidden sector (dark sector), present in many models of new physics beyond the Standard Model, which contains a colorful spectrum of new particles. Recently, it has been shown that this spectrum can give rise to unique signatures at colliders when the mass scale in the hidden sector is well below a TeV; as in Hidden Valleys, Stueckelberg extensions, and Unparticle models. These physics models produce unique signatures of collimated leptons at high energies. By studying these ephemeral particles we hope to trace the history of the Universe. Our present theories lead us to believe that there is something new just around the corner, which should be accessible at the energies made available by modern colliders.

scholarly journals Muon g − 2 from millicharged hidden confining sector

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Yang Bai ◽  
Seung J. Lee ◽  
Minho Son ◽  
Fang Ye
Keyword(s):  
Minimal Model ◽  
Vacuum Polarization ◽  
New Physics ◽  
Low Energy ◽  
Fixed Target ◽  
Fixed Target Experiments ◽  
Hidden Sector ◽  
Lepton Colliders ◽  
Multiplicity Factor ◽  
Belle Ii

Abstract We provide a novel explanation to the muon g − 2 excess with new physics contributions at the two-loop level. In this scenario, light millicharged particles are introduced to modify the photon vacuum polarization that contributes to muon g − 2 at one additional loop. The muon g − 2 excess can be explained with the millicharged particle mass mχ around 10 MeV and the product of the multiplicity factor and millicharge squared of Nχε2 ∼ 10−3. The minimal model faces severe constraints from direct searches at fixed-target experiments and astrophysical observables. However, if the millicharged particles are also charged under a hidden confining gauge group SU(Nχ) with a confinement scale of MeV, hidden-sector hadrons are unstable and can decay into neutrinos, which makes this scenario consistent with existing constraints. This explanation can be well tested at low-energy lepton colliders such as BESIII and Belle II as well as other proposed fixed-target experiments.

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