Confronting grand unification with lepton flavour violation, dark matter and LHC data
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Springer
Received: March 16, Revised: August 6, Accepted: August 27, Published: September 30,
2020 2020 2020 2020
Confronting grand unification with lepton flavour violation, dark matter and LHC data
a
Theoretical Particle Physics and Cosmology Group, Department of Physics, King’s College London, Strand, London WC2R 2LS, U.K. b National Institute of Chemical Physics & Biophysics, R¨ avala 10, 10143 Tallinn, Estonia c Theoretical Physics Department, CERN, CH-1211 Geneva 23, Switzerland d Departamento de Ciencias Integradas y Centro de Estudios Avanzados en F´ısica Matem´ aticas y Computaci´ on, Campus El Carmen, Universidad de Huelva, 21071 Huelva, Spain e Department of Physics, University of Patras, 26500 Patras, Greece f Instituto de F´ısica Corpuscular, IFIC-UV/CSIC, Valencia, Spain g Bartol Research Institute, Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, U.S.A.
E-mail: [email protected], [email protected], [email protected], [email protected], [email protected] 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. Keywords: Supersymmetry Phenomenology ArXiv ePrint: 2002.11057
c The Authors. Open Access, Article funded by SCOAP3 .
https://doi.org/10.1007/JHEP09(2020)197
JHEP09(2020)197
J. Ellis,a,b,c M.E. G´ omez,d S. Lola,e R. Ruiz de Austrif and Q. Shafig
Contents 1
2 Non-universal soft supersymmetry breaking in GUT models
2
3 Relic density mechanisms and GUT mass relations
4
4 Lepton-flavour mixing effects and see-saw neutrino masses
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5 LFV, dark matter and the LHC 5.1 BR(li → lj γ) 5.2 Combining µ → eγ and LHC bounds 5.3 LFV signals, SUSY spectroscopy and DM detection
9 10 12 15
6 Conclusions
19
1
Introduction
Experimental and theoretical considerations both require extending the Standard Model (SM) of particl
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