Toward the discovery of matter creation with neutrinoless ββ decay

Reviews of Modern Physics, Journal Year: 2023, Volume and Issue: 95(2)

Published: May 30, 2023

The discovery of neutrinoless double-beta decay could soon be within reach. This hypothetical ultra-rare nuclear offers a privileged portal to physics beyond the Standard Model particle physics. Its observation would constitute matter-creating process, corroborating leading theories why universe contains more matter than antimatter, and how forces unify at high energy scales. It also prove that neutrinos anti-neutrinos are not two distinct particles, but can transform into each other, with their mass described by unique mechanism conceived Majorana. recognition massless necessitates an explanation has boosted interest in decay. field stands now turning point. A new round experiments is currently being prepared for next decade cover important region parameter space. In parallel, advances theory laying groundwork connect underlying Meanwhile, landscape continues find motivations own antiparticle. review brings together experimental, theory, aspects connected decay, explore path toward - its discovery.

Language: Английский

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The present and future status of heavy neutral leptons

Journal of Physics G Nuclear and Particle Physics, Journal Year: 2023, Volume and Issue: 50(2), P. 020501 - 020501

Published: Jan. 20, 2023

Abstract The existence of nonzero neutrino masses points to the likely multiple Standard Model neutral fermions. When such states are heavy enough that they cannot be produced in oscillations, referred as leptons (HNLs). In this white paper, we discuss present experimental status HNLs including colliders, beta decay, accelerators, well astrophysical and cosmological impacts. We importance continuing search for HNLs, its potential impact on our understanding key fundamental questions, additionally outline future prospects next-generation experiments or upcoming accelerator run scenarios.

Language: Английский

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A next-generation liquid xenon observatory for dark matter and neutrino physics

Journal of Physics G Nuclear and Particle Physics, Journal Year: 2022, Volume and Issue: 50(1), P. 013001 - 013001

Published: Dec. 21, 2022

The nature of dark matter and properties neutrinos are among the most pressing issues in contemporary particle physics. dual-phase xenon time-projection chamber is leading technology to cover available parameter space for Weakly Interacting Massive Particles (WIMPs), while featuring extensive sensitivity many alternative candidates. These detectors can also study through neutrinoless double-beta decay a variety astrophysical sources. A next-generation xenon-based detector will therefore be true multi-purpose observatory significantly advance physics, nuclear astrophysics, solar cosmology. This review article presents science cases such detector.

Language: Английский

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Feebly-interacting particles: FIPs 2022 Workshop Report

The European Physical Journal C, Journal Year: 2023, Volume and Issue: 83(12)

Published: Dec. 11, 2023

Language: Английский

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Long-lived sterile neutrinos at the LHC in effective field theory

Journal of High Energy Physics, Journal Year: 2021, Volume and Issue: 2021(3)

Published: March 1, 2021

A bstract We study the prospects of a displaced-vertex search sterile neutrinos at Large Hadron Collider (LHC) in framework neutrino-extended Standard Model Effective Field Theory ( ν SMEFT). The production and decay can proceed via standard active-sterile neutrino mixing weak current, as well through higher-dimensional operators arising from decoupled new physics. If are long-lived, their lead to displaced vertices which be reconstructed. investigate sensitivities for ATLAS/CMS detector, future far-detector experiments: AL3X, ANUBIS, CODEX-b, FASER, MATHUSLA, MoEDAL-MAPP, proposed fixed-target experiment SHiP. scenarios where predominantly produced rare charm bottom mesons decays minimal and/or dimension-six SMEFT Lagrangian. perform simulations determine potential reach high-luminosity LHC experiments probing EFT operators, finding that these very competitive with other searches.

Language: Английский

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Analysis of light neutrino exchange and short-range mechanisms in0νββdecay

Physical review. D/Physical review. D., Journal Year: 2020, Volume and Issue: 102(9)

Published: Nov. 16, 2020

Neutrinoless double beta decay ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) is a crucial test for lepton number violation. Observation of this process would have fundamental implications neutrino physics, theories beyond the Standard Model and cosmology. Focusing on so-called short-range operators $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ their potential interplay with standard light Majorana exchange, we present first complete calculation relevant nuclear matrix elements, performed within interacting boson model (IBM-2). Furthermore, calculate phase space factors using exact Dirac electron wave functions, taking into account finite size screening by cloud. The obtained numerical results are presented together up-to-date limits mass mechanism effective in framework. Finally, interpret particle physics scenarios incorporating heavy sterile neutrinos, left-right symmetry $R$-parity violating supersymmetry.

Language: Английский

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Toward Complete Leading-Order Predictions for Neutrinoless Double β Decay

Physical Review Letters, Journal Year: 2021, Volume and Issue: 126(17)

Published: April 30, 2021

The amplitude for the neutrinoless double $\ensuremath{\beta}$ ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) decay of two-neutron system $nn\ensuremath{\rightarrow}pp{e}^{\ensuremath{-}}{e}^{\ensuremath{-}}$ constitutes a key building block nuclear-structure calculations heavy nuclei employed in large-scale $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ searches. Assuming that process is mediated by light-Majorana-neutrino exchange, systematic analysis chiral effective field theory shows already at leading order contact operator required to ensure renormalizability. In this Letter, we develop method estimate numerical value its coefficient (in analogy Cottingham formula electromagnetic contributions hadron masses) and validate result reproducing charge-independence-breaking contribution nucleon-nucleon scattering lengths. Our central result, while derived dimensional regularization, given terms renormalized ${\mathcal{A}}_{\ensuremath{\nu}}(|\mathbf{p}|,|{\mathbf{p}}^{\ensuremath{'}}|)$, matching which will allow one determine contact-term regularization schemes calculations. results thus greatly reduce crucial uncertainty interpretation searches decay.

Language: Английский

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Mapping the Viable Parameter Space for Testable Leptogenesis

Physical Review Letters, Journal Year: 2022, Volume and Issue: 128(5)

Published: Feb. 1, 2022

We for the first time map range of active-sterile neutrino mixing angles in which leptogenesis is possible type I seesaw model with three heavy neutrinos Majorana masses between 50 MeV and 70 TeV, covering entire experimentally accessible mass range. Our study includes both, asymmetry generation during freeze-in (ARS mechanism) freeze-out (resonant leptogenesis) neutrinos. The mixings feasible considerably larger than minimal only two right-handed extends all way up to current experimental bounds. For such large HL-LHC could potentially observe a number events that enough compare different decay channels, step towards testing hypothesis these particles may be responsible origin matter masses.

Language: Английский

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Effective portals to heavy neutral leptons

Journal of High Energy Physics, Journal Year: 2023, Volume and Issue: 2023(9)

Published: Sept. 1, 2023

A bstract The existence of right-handed neutrinos, or heavy neutral leptons (HNLs), is strongly motivated by the observation neutrino masses and mixing. mass these new particles could lie below electroweak scale, making them accessible to low-energy laboratory experiments. Additional physics at high energies can mediate interactions between Standard Model HNLs, most conveniently parametrized Effective Field Theory, ν SMEFT for short. In this work, we consider dimension six operators involving one HNL field in range $$ \mathcal{O} O (1) MeV < M N (100) GeV. By recasting existing experimental limits on production decay light particles, constrain Wilson coefficients scale each operator as a function mass. 1

Language: Английский

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Long-lived heavy neutral leptons from mesons in effective field theory

Journal of High Energy Physics, Journal Year: 2023, Volume and Issue: 2023(1)

Published: Jan. 4, 2023

In the framework of low-energy effective field theory Standard Model extended with heavy neutral leptons (HNLs), we calculate production rates HNLs from meson decays triggered by dimension-six operators. We consider both lepton-number-conserving and lepton-number-violating four-fermion operators involving either a pair or single HNL. Assuming that are long-lived, perform simulations investigate reach proposed far detectors at high-luminosity LHC to (i) active-heavy neutrino mixing (ii) Wilson coefficients associated operators, for HNL masses below mass $B$-meson. further convert latter new-physics scales. Our results show scales in excess hundreds TeV squared as small $10^{-15}$ can be probed these experiments.

Language: Английский

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