Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-03-15
Physics
High Energy Physics
High Energy Physics - Phenomenology
55 pages, 13 figures, final version to be published in JHEP
Scientific paper
We investigate grand unified theories (GUTs) in scenarios where electroweak (EW) symmetry breaking is triggered by a light composite Higgs, arising as a Nambu-Goldstone boson from a strongly interacting sector. The evolution of the standard model (SM) gauge couplings can be predicted at leading order, if the global symmetry of the composite sector is a simple group G that contains the SM gauge group. It was noticed that, if the right-handed top quark is also composite, precision gauge unification can be achieved. We build minimal consistent models for a composite sector with these properties, thus demonstrating how composite GUTs may represent an alternative to supersymmetric GUTs. Taking into account the new contributions to the EW precision parameters, we compute the Higgs effective potential and prove that it realizes consistently EW symmetry breaking with little fine-tuning. The G group structure and the requirement of proton stability determine the nature of the light composite states accompanying the Higgs and the top quark: a coloured triplet scalar and several vector-like fermions with exotic quantum numbers. We analyse the signatures of these composite partners at hadron colliders: distinctive final states contain multiple top and bottom quarks, either alone or accompanied by a heavy stable charged particle, or by missing transverse energy.
Frigerio Michele
Serra Javi
Varagnolo Alvise
No associations
LandOfFree
Composite GUTs: models and expectations at the LHC does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Composite GUTs: models and expectations at the LHC, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Composite GUTs: models and expectations at the LHC will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-139473