Theoretical Particle Physics

Beyond the Standard Model Phenomenology and Cosmology

Our phenomenological activities cover a broad spectrum of topics in (astro-)particle physics, always with the objective of providing a bridge between theory and experiment. We address ideas Beyond the Standard Model (BSM) of particle physics, such as supersymmetry, extra dimensions, and models including new forces and matter. The pheno group is in particular very active in the study of BSM physics at colliders and important efforts are dedicated to the signatures of supersymmetry and/or of dark matter at the next LHC run, expected to deliver data in 2015. Recent work has explored collider signatures of gauge mediated supersymmetry breaking and signatures of goldstino and gravitino production at the LHC.

Dark matter (DM) and dark energy (DE) are supposed to be the dominant contributions to the energy budget of the universe. Yet, as of today their true nature is unknown and elucidating this is one of the most important problem in fundamental physics. Beginning with the nature of DM, one possibility is that it is made of new fundamental particles. We study DM scenarios in BSM physics and look for distinctive DM signature in direct and indirect DM searches, using colliders as well as astro-cosmo probes. Our particular focus has been in models of scalar WIMP (weakly interacting massive particles) dark matter and their observable signatures. Precise knowledge of the cosmic expansion and of the growth of perturbations will shed light on the properties of DE (and also DM). The ultimate goal of planned experiments is to discover whether DE is a mere cosmological constant, a new kind of fluid, or due to modifications of the laws of gravity. We are using current data as well as forecasts for future experiments to constrain the content of our universe and the nature of DE. 

 

Selected recent work in this area

Pseudo-Goldstini in Field Theory
By Riccardo Argurio, Zohar Komargodski, Alberto Mariotti.
arXiv:1102.2386 [hep-th]
Phys.Rev.Lett. 107 (2011) 061601. 

Multilepton signals of gauge mediated supersymmetry breaking at the LHC
By Jorgen D'Hondt, Karen De Causmaecker, Benjamin Fuks, Alberto Mariotti, Kentarou Mawatari, Christoffer Petersson, Diego Redigolo.
arXiv:1310.0018 [hep-ph]
Phys.Lett. B731 (2014) 7-12

Constraints on dark matter annihilation from CMB observations before Planck
By Laura Lopez-Honorez, Olga Mena, Sergio Palomares-Ruiz, Aaron C. Vincent.
arXiv:1303.5094 [astro-ph.CO]
JCAP 1307 (2013) 046