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Simple non-Abelian extensions of the standard model gauge group and the diboson excesses at the LHC.
- Source :
-
Physical Review D: Particles, Fields, Gravitation & Cosmology . Nov2015, Vol. 92 Issue 9-A, p095025-1-095025-18. 18p. - Publication Year :
- 2015
-
Abstract
- The ATLAS collaboration reported excesses at around 2 TeV in the di-boson production decaying into hadronic final states. We consider the possibility of explaining the excesses with extra gauge bosons in two simple non-Abelian extensions of the Standard Model. One is the so-called G(221) models with a symmetry structure of SU(2)1⊗SU(2)2⊗U(1)X and the other is the G(331) models with an extended symmetry of SU(3)C⊗SU(3)L⊗U(1)X. The W' and Z' bosons emerge after the electroweak symmetry is spontaneously broken. Two patterns of symmetry breaking in the G(221) models are considered in this work: one is SU(2)L⊗SU(2)2⊗U(1)X→SU(2)L⊗U(1)Y, the other is SU(2)1⊗SU(2)2⊗U(1)Y→SU(2)L⊗U(1)Y. The symmetry breaking of the G(331) model is SU(3)L⊗U(1)X→SU(2)L⊗U(1)Y. We perform a global analysis of W' and Z' phenomenology in ten new physics models, including all the channels of W'/Z' decay. Our study shows that the leptonic mode and the dijet mode of W'/Z' decays impose a very stringent bound on the parameter space in several new physics models. Such tight bounds provide a useful guide for building new physics models to address on the diboson anomalies. We also note that the Left-Right and Lepton-Phobic models can explain the 3.4σ WZ excess if the 2.6σ deviation in the W+W- pair around 2 TeV were confirmed to be a fluctuation of the SM backgrounds. [ABSTRACT FROM AUTHOR]
- Subjects :
- *STANDARD model (Nuclear physics)
*GAUGE bosons
*ELECTROWEAK interactions
Subjects
Details
- Language :
- English
- ISSN :
- 24700010
- Volume :
- 92
- Issue :
- 9-A
- Database :
- Academic Search Index
- Journal :
- Physical Review D: Particles, Fields, Gravitation & Cosmology
- Publication Type :
- Periodical
- Accession number :
- 112015584
- Full Text :
- https://doi.org/10.1103/PhysRevD.92.095025