Probing neutrino mass with displaced vertices at the fermilab Tevatron

ABSTRACT: Supersymmetric extensions of the standard model exhibiting bilinear R-parity violation can generate naturally the observed neutrino mass spectrum as well as mixings. One interesting feature of these scenarios is that the lightest supersymmetric particle (LSP) is unstable, with several of i...

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Autores:
de Campos, Fernando
Éboli, Oscar J. P.
Magro, Mauricio Bernardino
Porod, William
Restrepo Quintero, Diego Alejandro
Valle, José W. F.
Tipo de recurso:
Article of investigation
Fecha de publicación:
2005
Institución:
Universidad de Antioquia
Repositorio:
Repositorio UdeA
Idioma:
eng
OAI Identifier:
oai:bibliotecadigital.udea.edu.co:10495/8629
Acceso en línea:
http://hdl.handle.net/10495/8629
Palabra clave:
Neutrinos
Vértices desplazados
Fermilab Tevatron
Supersimetría
Rights
openAccess
License
Atribución-NoComercial-SinDerivadas 2.5 Colombia
Description
Summary:ABSTRACT: Supersymmetric extensions of the standard model exhibiting bilinear R-parity violation can generate naturally the observed neutrino mass spectrum as well as mixings. One interesting feature of these scenarios is that the lightest supersymmetric particle (LSP) is unstable, with several of its decay properties predicted in terms of neutrino mixing angles. A smoking gun of this model in colliders is the presence of displaced vertices due to LSP decays in large parts of the parameter space. In this work we focus on the simplest model of this type that comes from minimal supergravity with universal R-parity conserving soft breaking of supersymmetry augmented with bilinear R-parity breaking terms at the electroweak scale (RmSUGRA). We evaluate the potential of the Fermilab Tevatron to probe the RmSUGRA parameters through the analysis of events possessing two displaced vertices stemming from LSP decays. We show that requiring two displaced vertices in the events leads to a reach in m1/2 twice the one in the usual multilepton signals in a large fraction of the parameter space.