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Neutrino non-standard interactions meet precision measurements of $N_{\rm eff}$

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TLDR
In this paper, the number of relativistic species in the early universe has been precisely calculated in the standard model, and would be measured to the percent level by CMB-S4 in future.
Abstract
The number of relativistic species, $N_{\rm eff}$, has been precisely calculated in the standard model, and would be measured to the percent level by CMB-S4 in future. Neutral-current non-standard interactions would affect neutrino decoupling in the early Universe, thus modifying $N_{\rm eff}$. We parameterize those operators up to dimension-7 in the effective field theory framework, and then provide a complete, generic and analytical dictionary for the collision term integrals. From precision measurements of $N_{\rm eff}$, the most stringent constraint is obtained for the dimension-6 vector-type neutrino-electron operator, whose scale is constrained to be above about 195 (331) GeV from Planck (CMB-S4). We find our results complementary to other experiments like neutrino coherent scattering, neutrino oscillation, collider, and neutrino deep inelastic scattering experiments.

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The Forward Physics Facility at the High-Luminosity LHC

Jonathan L. Feng, +235 more
- 09 Mar 2022 - 
TL;DR: The Forward Physics Facility (FPF) as mentioned in this paper is a suite of experiments to probe standard model processes and search for physics beyond the standard model (BSM) beyond the acceptance of existing LHC experiments.
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Self-interacting neutrinos, the Hubble parameter tension, and the cosmic microwave background

TL;DR: In this article, a comprehensive study of cosmological constraints on non-standard neutrino self-interactions using cosmic microwave background (CMB) and baryon acoustic oscillation data is performed.
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The Forward Physics Facility: Sites, experiments, and physics potential

- 01 Jul 2022 - 
TL;DR: The Forward Physics Facility (FPF) as mentioned in this paper is a proposal to create a cavern with the space and infrastructure to support a suite of far-forward experiments at the Large Hadron Collider during the High Luminosity era.
Journal ArticleDOI

Light Dirac neutrino portal dark matter with observable $\Delta{N_{\rm eff}}$

TL;DR: In this paper, a Dirac neutrino portal dark matter scenario was proposed by minimally extending the particle content of the Standard Model (SM) with three right-handed neutrinos, one Dirac fermion dark matter candidate and a complex scalar.
Journal ArticleDOI

Two Sides of the Same Coin: Sterile Neutrinos and Dark Radiation, Status and Perspectives

Maria Archidiacono, +1 more
- 25 Jan 2022 - 
TL;DR: The presence of light sterile neutrinos is one of the unanswered questions of particle physics as mentioned in this paper , i.e., any form of radiation present in the early Universe besides photons and standard (active).
References
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Journal ArticleDOI

Low Energy Effective Field Theory Operator Basis at $d \le 9$

TL;DR: In this article, the authors obtained the complete operator bases at mass dimensions 5, 6, 7, 8, 9 for the low energy effective field theory (LEFT), which parametrize various physics effects between the QCD scale and the electroweak scale.
Journal ArticleDOI

$\sin^2(\theta)w$ estimate and bounds on nonstandard interactions at source and detector in the solar neutrino low-energy regime

TL;DR: In this article, the authors explore the implications of the Borexino experiment's real-time measurements of the lowest energy part of the neutrino spectrum from the primary pp fusion process up to 0.420 MeV through the 7^Be decay at 0.862 MeV to the pep reaction at 1.44 MeV.
Journal ArticleDOI

On the effective theory of neutrino-electron and neutrino-quark interactions

TL;DR: In this paper, the four-fermion effective theory of neutrino interactions within the Standard Model including one-loop electroweak radiative corrections, in combination with the measured muon lifetime and precision electroweak data, was determined.
Journal ArticleDOI

Incomplete neutrino decoupling effect on big bang nucleosynthesis

TL;DR: In this article, the effect of neutrino decoupling on the subsequent nucleosynthesis was investigated. But the authors focused on the effect on the final light element abundances.
Journal ArticleDOI

Probing nonstandard neutrino interactions at the LHC Run II

TL;DR: In this article, it was shown that much of the parameter space accessible to such dedicated neutrino experiments is already ruled out by the Run II data of the Large Hadron Collider experiment.
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