scholarly journals MeV neutrino dark matter: relic density, lepton flavour violation and electron recoil

2019 ◽  
Vol 2019 (11) ◽  
Author(s):  
Juri Fiaschi ◽  
Michael Klasen ◽  
Miguel Vargas ◽  
Christian Weinheimer ◽  
Sybrand Zeinstra
Keyword(s):  
Dark Matter ◽  
Lepton Flavour Violation ◽  
Dark Matter Relic Density ◽  
Electron Recoil ◽  
Relic Density ◽  
Flavour Violation ◽  
Lepton Flavour

scholarly journals Confronting grand unification with lepton flavour violation, dark matter and LHC data

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
J. Ellis ◽  
M. E. Gómez ◽  
S. Lola ◽  
R. Ruiz de Austri ◽  
Q. Shafi
Keyword(s):  
Dark Matter ◽  
Group Symmetry ◽  
Neutrino Masses ◽  
High Input ◽  
Lepton Flavour Violation ◽  
Flavour Violation ◽  
Soft Supersymmetry Breaking ◽  
Good Detection ◽  
Lepton Flavour

Abstract We explore possible signatures for charged lepton flavour violation (LFV), sparticle discovery at the LHC and dark matter (DM) searches in grand unified theories (GUTs) based on SU(5), flipped SU(5) (FSU(5)) and SU(4)c×SU(2)L×SU(2)R (4-2-2). We assume that soft supersymmetry-breaking terms preserve the group symmetry at some high input scale, and focus on the non-universal effects on different matter representations generated by gauge interactions at lower scales, as well as the charged LFV induced in Type-1 see-saw models of neutrino masses. We identify the different mechanisms that control the relic DM density in the various GUT models, and contrast their LFV and LHC signatures. The SU(5) and 4-2-2 models offer good detection prospects both at the LHC and in LFV searches, though with different LSP compositions, and the SU(5) and FSU(5) models offer LFV within the current reach. The 4-2-2 model allows chargino and gluino coannihilations with neutralinos, and the former offer good detection prospects for both the LHC and LFV, while gluino coannihilations lead to lower LFV rates. Our results indicate that LFV is a powerful tool that complements LHC and DM searches, providing significant insights into the sparticle spectra and neutrino mass parameters in different models.

scholarly journals Exothermic dark mesons in light of electron recoil excess at XENON1T

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Soo-Min Choi ◽  
Hyun Min Lee ◽  
Bin Zhu
Keyword(s):  
Dark Matter ◽  
Inelastic Scattering ◽  
Small Mass ◽  
Density Current ◽  
Flavor Symmetry ◽  
Color Group ◽  
Dark Sector ◽  
The Standard Model ◽  
Electron Recoil ◽  
Relic Density

Abstract We consider a novel mechanism to realize exothermic dark matter with dark mesons in the limit of approximate flavor symmetry in a dark QCD. We introduce a local dark U(1)′ symmetry to communicate between dark mesons and the Standard Model via Z′ portal by partially gauging the dark flavor symmetry with flavor-dependent charges for cancelling chiral anomalies in the dark sector. After the dark local U(1)′ is broken spontaneously by the VEV of a dark Higgs, there appear small mass splittings between dark quarks, consequently, leading to small split masses for dark mesons, required to explain the electron recoil excess in XENON1T by the inelastic scattering between dark mesons and electron. We propose a concrete benchmark model for split dark mesons based on SU(3)L× SU(3)R/SU(3)V flavor symmetry and SU(Nc) color group and show that there exists a parameter space making a better fit to the XENON1T data with two correlated peaks from exothermic processes and satisfying the correct relic density, current experimental and theoretical constraints.

scholarly journals Lepton-flavour violation in a Pati-Salam model with gauged flavour symmetry

2016 ◽  
Vol 2016 (11) ◽  
Author(s):  
Thorsten Feldmann ◽  
Christoph Luhn ◽  
Paul Moch
Keyword(s):  
Lepton Flavour Violation ◽  
Flavour Symmetry ◽  
Flavour Violation ◽  
Lepton Flavour

Theoretical uncertainty of the supersymmetric dark matter relic density from scheme and scale variations

2016 ◽  
Vol 93 (11) ◽  
Author(s):  
J. Harz ◽  
B. Herrmann ◽  
M. Klasen ◽  
K. Kovařík ◽  
P. Steppeler
Keyword(s):  
Dark Matter ◽  
Theoretical Uncertainty ◽  
Dark Matter Relic Density ◽  
Relic Density
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