Encouraged by the advent of a new generation of underground detectors – JUNO, DUNE and Hyper-Kamiokande – that are projected to improve significantly on the present sensitivities to various baryon decay modes, we revisit baryon decay in the minimal supersymmetric SU(5) GUT. We discuss the phenomenological uncertainties associated with hadronic matrix elements and the value of the strong coupling αs – which are the most important – the weak mixing angle θW, quark masses including one-loop renormalization effects, quark mixing and novel GUT phases that are not visible in electroweak interaction processes. We apply our analysis to a variety of CMSSM, super- and sub-GUT scenarios in which soft supersymmetry-breaking parameters are assumed to be universal at, above and below the GUT scale, respectively. In many cases, we find that the next generation of underground detectors should be able to probe models with sparticle masses that are O(10) TeV, beyond the reach of the LHC.
Bibliographical noteFunding Information:
J.E. thanks Teppei Katori and Francesca Di Lodovico for useful discussions. The work of J.E. was supported in part by STFC (UK) via research grant ST/L000258/1, and in part by the Estonian Research Council via a Mobilitas Pluss grant. The work of N.N. was supported by the Grant-in-Aid for Young Scientists B (no. 17K14270) and Innovative Areas (no. 18H05542). The work of K.A.O. was supported in part by DOE grant DE-SC0011842 at the University of Minnesota. K.A.O. also acknowledges support by the Director, Office of Science, Office of High Energy Physics of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231, and would like to thank the Department of Physics and the high energy theory group at the University of California, Berkeley as well as the theory group at LBNL for their hospitality and financial support while finishing this work. L. V. acknowledges the hospitality and the financial support from the Fine Theoretical Physics Institute at the University of Minnesota and from the Abdus Salam International Centre for Theoretical Physics, Italy, during various stages of this project.