scholarly journals Vacuum stability and spontaneous violation of the lepton number at a low-energy scale in a model for light sterile neutrinos

2020 ◽  
Vol 102 (1) ◽  
Author(s):  
João Paulo Pinheiro ◽  
C. A. de S. Pires
Keyword(s):  
Energy Scale ◽  
Lepton Number ◽  
Low Energy ◽  
Sterile Neutrinos ◽  
Vacuum Stability

scholarly journals Constraints on the charged currents in general neutrino interactions with sterile neutrinos

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Tong Li ◽  
Xiao-Dong Ma ◽  
Michael A. Schmidt
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Neutral Current ◽  
New Physics ◽  
Effective Field ◽  
Lepton Number ◽  
Low Energy ◽  
Electroweak Scale ◽  
Sterile Neutrinos ◽  
Neutrino Interactions

Abstract In this work we investigate the implication of low-energy precision measurements on the quark-lepton charged currents in general neutrino interactions with sterile neutrinos in effective field theories. The physics in low-energy measurements is described by the low-energy effective field theory extended with sterile neutrinos (LNEFT) defined below the electroweak scale. We also take into account renormalization group running and match the LNEFT onto the Standard Model (SM) effective field theory with sterile neutrinos (SMNEFT) to constrain new physics (NP) above the electroweak scale. The most sensitive low-energy probes are from leptonic decays of pseudoscalar mesons and hadronic tau lepton decays in terms of precise decay branching fractions, the lepton flavor universality and the Cabibbo-Kobayashi-Maskawa (CKM) unitarity. We also consider other constraints including nuclear beta decay. The constraints on charged current operators are generally stronger than the ones for quark-neutrino neutral current operators. We find that the most stringent bounds on the NP scale of lepton-number-conserving and lepton- number-violating operators in SMNEFT are 74 (110) TeV and 9.8 (13) TeV, respectively, for the operators with down (strange) quark.

scholarly journals EXPLICITLY BROKEN LEPTON NUMBER AT LOW ENERGY IN THE HIGGS TRIPLET MODEL

2006 ◽  
Vol 21 (12) ◽  
pp. 971-977 ◽  
Author(s):  
C. A. DE S. PIRES
Keyword(s):  
Mass Spectrum ◽  
Energy Scale ◽  
Lepton Number ◽  
Low Energy ◽  
Triplet Model ◽  
Scalar Sector ◽  
Higgs Triplet Model

We assume that lepton number is explicitly broken at low energy scale (M) in the framework of the Higgs triplet (Δ) model. The scalar sector of the model is developed considering the particular assumption M = vΔ ≈ eV . We show that such assumption infers a particular mass spectrum for the scalars that compose the triplet and cause a decoupling of these scalars from those that compose the standard scalar doublet.

scholarly journals Operator bases in effective field theories with sterile neutrinos: d ≤ 9

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Hao-Lin Li ◽  
Zhe Ren ◽  
Ming-Lei Xiao ◽  
Jiang-Hao Yu ◽  
Yu-Hui Zheng
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Effective Field ◽  
Lepton Number ◽  
Low Energy ◽  
Field Theories ◽  
Sterile Neutrinos ◽  
Two Generations ◽  
Mass Dimension ◽  
Physical Effects

Abstract We obtain the complete and independent bases of effective operators at mass dimension 5, 6, 7, 8, 9 in both standard model effective field theory with light sterile right-handed neutrinos (νSMEFT) and low energy effective field theory with light sterile neutrinos (νLEFT). These theories provide systematical parametrizations on all possible Lorentz-invariant physical effects involving in the Majorana/Dirac neutrinos, with/without the lepton number violations. In the νSMEFT, we find that there are 2 (18), 29 (1614), 80 (4206), 323 (20400), 1358 (243944) independent operators with sterile neutrinos included at the dimension 5, 6, 7, 8, 9 for one (three) generation of fermions, while 24, 5223, 3966, 25425, 789426 independent operators in the νLEFT for two generations of up-type quarks and three generations of all other fermions.

scholarly journals CPT-VIOLATING NEUTRINO OSCILLATIONS

2010 ◽  
Vol 25 (08) ◽  
pp. 597-606 ◽  
Author(s):  
S. ESPOSITO ◽  
G. SALESI
Keyword(s):  
Symmetry Breaking ◽  
Phenomenological Model ◽  
Present Model ◽  
Neutrino Oscillations ◽  
Lorentz Violation ◽  
Energy Scale ◽  
Low Energy ◽  
Grand Unification ◽  
Sterile Neutrinos ◽  
Lorentz Symmetry Breaking

We propose a simple phenomenological model predicting, through Lorentz symmetry breaking, a CPT-violating asymmetry between particle and antiparticle states in neutrino oscillations involving sterile neutrinos. Such a model is able to explain the apparently observed anomalous excess of low-energy νe-like events, reported by the MiniBooNE collaboration, as well as the non-observation of the corresponding anomalous excess of [Formula: see text]-like events. The present model leads to very specific physical predictions in the neutrino oscillations scenario, and account for the observed anomalies in terms of only one CPT-Lorentz violation parameter of the order of the Grand-Unification energy scale.

scholarly journals Low-energy scale of the periodic Anderson model

2000 ◽  
Vol 61 (19) ◽  
pp. 12799-12809 ◽  
Author(s):  
Th. Pruschke ◽  
R. Bulla ◽  
M. Jarrell
Keyword(s):  
Anderson Model ◽  
Energy Scale ◽  
Low Energy ◽  
Periodic Anderson Model

scholarly journals Low-energy scale excitations in the spectral function of organic monolayer systems

2012 ◽  
Vol 85 (16) ◽  
Author(s):  
J. Ziroff ◽  
S. Hame ◽  
M. Kochler ◽  
A. Bendounan ◽  
A. Schöll ◽  
...  
Keyword(s):  
Spectral Function ◽  
Energy Scale ◽  
Low Energy ◽  
Organic Monolayer

ALTERNATIVE LOW ENERGY SUPERSYMMETRY

1990 ◽  
Vol 05 (07) ◽  
pp. 467-472 ◽  
Author(s):  
LAWRENCE J. HALL
Keyword(s):  
Baryon Number ◽  
Lepton Number ◽  
Low Energy ◽  
Additional Symmetry ◽  
Alternative Models ◽  
Gauge Symmetries

Models of low energy supersymmetry require some additional symmetry beyond the known gauge symmetries. The usual preference for R parity, which leads to the standard low energy supersymmetry model, has no clear theoretical motivation. The alternative models with minimal field content are reviewed. In one case R parity is spontaneously broken by a large sneutrino vev. In three other cases R parity is replaced by an alternative symmetry; baryon number, lepton number or ZN.

scholarly journals The pseudogap in La2–xSrxCuO4: A Raman viewpoint

2000 ◽  
Vol 78 (5-6) ◽  
pp. 483-493 ◽  
Author(s):  
J G Naeini ◽  
J C Irwin ◽  
T Sasagawa ◽  
Y Togawa ◽  
K Kishio
Keyword(s):  
Fermi Surface ◽  
Normal State ◽  
Low Temperatures ◽  
Spectral Weight ◽  
Energy Scale ◽  
Low Energy ◽  
Scattering Rate ◽  
Low Energies ◽  
Consistent Picture ◽  
Rate Suppression

We report the results of Raman scattering experiments on single crystals of La2–xSrxCuO4 (La214) as a function of temperature and doping. In underdoped compounds low-energy B1g spectral weight is depleted in association with the opening of a pseudogap on regions of the Fermi surface located near (±π, 0) and (0, ±π).The magnitude of the depletion increases with decreasing doping, and in the most underdoped samples, with decreasing temperature.The spectral weight that is lost at low energies (ω [Formula: see text] 800 cm–1) is transferred to the higher energy region normally occupied by multimagnon scattering. From the normal-state B2g spectra we have determined the scattering rate Γ(ω,T) of qausiparticles located near the diagonal directions in k-space. In underdoped compounds, Γ(ω,T) is suppressed at low temperatures for energies less than Eg(x) [Formula: see text] 800 cm–1. The doping dependence of both the two-magnon scattering and the scattering rate suppression suggest that the pseudogap is characterized by an energy scale Eg ~ J, where J is the antiferromagnetic super-exchange energy. Comparison with the results from other techniques provides a consistent picture of the pseudogap in La214.PACS Nos.: 74.25.Gz, 74.72.Dn, 78.30.Er

scholarly journals SPONTANEOUS PHYSICAL COMPACTIFICATION OF THE EXTRA DIMENSIONS

2001 ◽  
Vol 16 (36) ◽  
pp. 2327-2333
Author(s):  
TIANJUN LI
Keyword(s):  
Symmetry Breaking ◽  
Extra Dimensions ◽  
High Energy ◽  
Energy Scale ◽  
Low Energy ◽  
Temperature Dependent ◽  
Supergravity Theory ◽  
Brane Model ◽  
High Energy Scale ◽  
Bulk Cosmological Constant

We conjecture that the extra dimensions are physical noncompact at high energy scale or high temperature; after the symmetry breaking or cosmological phase transition, the bulk cosmological constant may become negative, and then, the extra dimensions may become physical compact at low energy scale. We show this in a five-dimensional toy brane model with three parallel three-branes and a real bulk scalar whose potential is temperature-dependent. We also point out that after the global or gauge symmetry breaking, or the supersymmetry breaking in supergravity theory, the spontaneous physical compactification of the extra dimensions might be realized.

scholarly journals Low energy supersymmetry with baryon and lepton number gauged

2011 ◽  
Vol 84 (5) ◽  
Author(s):  
Pavel Fileviez Pérez ◽  
Mark B. Wise
Keyword(s):  
Lepton Number ◽  
Low Energy
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