https://doi.org/10.1140/epjc/s10052-021-09829-8
Regular Article - Theoretical Physics
Flipped 
1
Theoretical Particle Physics and Cosmology Group, Department of Physics, King’s College London, WC2R 2LS, London, UK
2
Theoretical Physics Department, CERN, 1211, Geneva 23, Switzerland
3
National Institute of Chemical Physics and Biophysics, Rävala 10, 10143, Tallinn, Estonia
4
Tsung-Dao Lee Institute, Shanghai Jiao Tong University, 200240, Shanghai, China
5
Department of Physics, University of Tokyo, Bunkyo-ku, 113–0033, Tokyo, Japan
6
George P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University, 77843, College Station, TX, USA
7
Astroparticle Physics Group, Houston Advanced Research Center (HARC), Mitchell Campus, 77381, Woodlands, TX, USA
8
Division of Natural Sciences, Academy of Athens, 10679, Athens, Greece
9
William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, 55455, Minneapolis, MN, USA
Received:
28
July
2021
Accepted:
15
November
2021
Published online:
7
December
2021
We analyze the possible magnitude of the supersymmetric contribution to 
in a flipped SU(5) GUT model. Unlike other GUT models which are severely constrained by universality relations, in flipped SU(5) the U(1) gaugino mass and the soft supersymmetry-breaking masses of right-handed sleptons are unrelated to the other gaugino, slepton and squark masses. Consequently, the lightest neutralino and the right-handed smuon may be light enough to mitigate the discrepancy between the experimental measurement of and the Standard Model calculation, in which case they may be detectable at the LHC and/or a 250 GeV 
collider, whereas the other gauginos and sfermions are heavy enough to escape detection at the LHC.
© The Author(s) 2021
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