Diphoton Higgs decay in an U(1) model

International Conference on Astrophysics and Particle Physics

December 08-10, 2016 Dallas, Texas, USA

Juan Pablo Rubio

Universidad Nacional de Colombia, Colombia
Ciudad Universitaria, Mexico

Posters & Accepted Abstracts: J Astrophys Aerospace Technol

Abstract :

At present, the possible confirmation by the LHC of a scalar particle identified as the Higgs boson has increased the study of its different decay channels, where the diphoton decay is one of the most prominent processes, because of the excess reported by LHC. These excesses may be associated with new symmetries in models beyond the standard model. In particular, family non-universal U(1)� symmetry models have many motivations to be considered, because they involve a large number of phenomenological consequences and theoretical aspects as flavor physics, physics of neutrinos, dark matter, among other effects. These models also involve a new neutral boson Z�, something else new anomalies appear. It is necessary to extend of the fermionic spectrum in order to obtain a chiral theory free of anomalies. On the other hand, the new symmetries require extended scalar sectors to generate the spontaneous breaking of the new Abelian symmetry and to get masses for the new gauge boson Z� and the extra fermionic content. In particular, the scalar sector is extended with two scalar doublets and two singlets, where one of the singlets is postulated as a dark matter (DM) candidate. The purpose of this work is to calculate the new contribution to the diphoton channel decay width of the Higgs, as it offers a clear signal of new physics associated with the scalar sector, where loop contribution from charged Higgs bosons are taken into account. Also, since the signal strength depends on the ratio with the total of Higgs boson decay, it is possible to evaluate the effects of a light DM component as an invisible final state.

Biography :

Email: jprubioo@unal.edu.co