Eur. Phys. J. C (2021) 81: 1079
https://doi.org/10.1140/epjc/s10052-021-09829-8

Regular Article - Theoretical Physics

Flipped ${\mathbf{g}}_{\mu }-\mathbf{2}$

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

^a jlevans@sjtu.edu.cn

Received: 28 July 2021
Accepted: 15 November 2021
Published online: 7 December 2021

Abstract

We analyze the possible magnitude of the supersymmetric contribution to $g_{\mu }-2$ 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 $g_{\mu }-2$ and the Standard Model calculation, in which case they may be detectable at the LHC and/or a 250 GeV $e^{+}{e}^{-}$ collider, whereas the other gauginos and sfermions are heavy enough to escape detection at the LHC.