Graviton resonance phenomenology and a pseudo-Nambu-Goldstone boson Higgs at the LHC

MAZZITELLI, JAVIER; ALVAREZ, EZEQUIEL; SZYNKMAN, ALEJANDRO; DA ROLD, LEANDRO

Physical Review D

American Physical Society

Lugar: Washington; Año: 2017 vol. 95

2470-0010

We present an effective description of a spin two massive state and a pseudoNambu-Goldstone boson Higgs in a two site model. Using this framework we modelthe spin two state as a massive graviton and we study its phenomenology at theLHC. We find that a reduced set of parameters can describe the most importantfeatures of this scenario. We address the question of which channel is the mostsensitive to detect this graviton. Instead of designing search strategies toestimate the significance in each channel, we compare the ratio of ourtheoretical predictions to the limits set by available experimental searchesfor all the decay channels and as a function of the free parameters in themodel. We discuss the phenomenological details contained in the outcome of thissimple procedure. The results indicate that, for the studied masses between 0.5and 3 TeV, the channels to look for such a graviton resonance are mainly ZZ,WW and γγ. This is the case even though top and bottom quarksdominate the branching ratios, since their experimental sensitivity is not asgood as the one of the electro-weak gauge bosons. We find that as the gravitonmass increases, the ZZ and WW channels become more important because of itsrelatively better enhancement over background, mainly due to fat jettechniques. We determine the region of the parameter space that has alreadybeen excluded and the reach for the LHC next stages. We also estimate the sizeof the loop-induced contributions to the production and decay of the graviton,and show in which region of the parameter space their effects are relevant forour analysis.