https://doi.org/10.1140/epjc/s10052-014-2858-7
Regular Article - Theoretical Physics
En-gauging naturalness
1
II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 , Hamburg, Germany
2
Physik Department T31, Technische Universität München, James-Franck-Straße 1, 85748 , Garching, Germany
3
LAPTh, Université de Savoie, CNRS, 9 Chemin de Bellevue, B.P. 110, 74941 , Annecy-le-Vieux, France
4
Deutsches Elektronen-Synchrotron, DESY, Notkestrasse 85, 22607 , Hamburg, Germany
* e-mail: andreas.goudelis@lapth.cnrs.fr
Received:
13
February
2014
Accepted:
9
April
2014
Published online:
20
May
2014
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.
© SIF and Springer-Verlag Berlin Heidelberg, 2014
