[Todos] ANUNCIO PRÓXIMO SEMINARIO- IFLP/DTO FÍSICA

[manias en fisica.unlp.edu.ar]

Les agradezco la difusión del anuncio del próximo seminario del ciclo
de Coloquios y Seminarios que se organizan en el Instituto de Física La
Plata/ Departamento de Física.

SEMINARIO  DEL IFLP y DEL DEPARTAMENTO
Martes 21 de mayo 11:00hs – AULA CHICA

TÍTULO: "A Singlet Extension of the Minimal Supersymmetric Standard Model:
Towards a more natural solution to to the little hierarchy problem"

EXPOSITOR: Alejandro de la Puente
TRIUNF
Canada's National Laboratory for Particle and Nuclear Physics

RESUMEN: I present a generalization of the Next-to-Minimal Supersymmetric
Standard Model (NMSSM), with an explicit $\mu$-term and a supersymmetric
mass for the singlet superfield, as a route to alleviating the little
hierarchy problem of the Minimal Supersymmetric Standard Model (MSSM). I
analyze two limiting cases of the model, characterized by the size of the
supersymmetric mass for the singlet superfield. The small and large limits
of this mass parameter are studied and we find that we can generate masses
for the lightest neutral Higgs boson up to $140$ GeV with top squarks
below the TeV scale, all couplings perturbative up to the gauge
unification scale and with no need to fine tune parameters in the scalar
potential. In light of the recent discovery by the ATLAS and CMS
collaborations of what appears to be a Standard Model (SM)-like Higgs
boson and recent bounds placed on supersymmetric particles, we show that
this model remains a natural low energy extension of the MSSM that
alleviates the little hierarchy problem.

This model which we call the S-MSSM is also embedded in a gauge-mediated
supersymmetric breaking scheme. We find an upper bound for the mass of
the SM-like Higgs boson of 124-125 GeV, with top squark masses at or below
the
TeV scale, within a minimal embedding of the S-MSSM into a gauge mediated
scheme,

In light of recent results from the Planck collaboration that suggests a
cold dark matter component with a physical density of Omega h^2 = 0.1199
+/- 0.0027, we consider a variation of the S-MSSM where an additional
singlet is added and a Peccei-Quinn symmetry is imposed. We study its
neutralino sector and compute the annihilation rate of the lightest
neutralino. We use existent cosmological and collider data to constrain
the parameter space, and find that a light neutralino with mass of 10-14
GeV can generate the right physical density of dark matter.

Lugar: Aula Chica del Departamento de Física de la Facultad de Ciencias
Exactas; calle 49 y 115

Contacto: manias at fisica.unlp.edu.ar

En archivo adjunto está la información para difundir en carteleras.
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