En-gauging naturalness

Aoife Bharucha , A. Goudelis (1) , M. Mcgarrie

1 LAPTH - Laboratoire d'Annecy-le-Vieux de Physique Théorique

The discovery of a 125.5 GeV Higgs with standard model-like couplings and naturalness considerations motivate gauge extensions of the MSSM. We analyse two variants of such an extension and carry out a phenomenological study of regions of the parameter space satisfying current direct and indirect constraints, employing state-of-the-art two-loop RGE evolution and GMSB boundary conditions. We find that due to the appearance of non-decoupled D-terms it is possible to obtain a 125.5 GeV Higgs with stops below 2 TeV, while the uncoloured sparticles could still lie within reach of the LHC. We compare the contributions of the stop sector and the non-decoupled D-terms to the Higgs mass, and study their effect on the Higgs couplings. We further investigate the nature of the next-to lightest supersymmetric particle, in light of the GMSB motivated searches currently being pursued by ATLAS and CMS.

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]

Aoife Bharucha, A. Goudelis, M. Mcgarrie. En-gauging naturalness. European Physical Journal C: Particles and Fields, 2014, 74 (5), pp.1-25. ⟨10.1140/epjc/s10052-014-2858-7⟩. ⟨hal-00994111⟩