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Physical Review D

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LHC-scale left-right symmetry and unification

Carolina Arbeláez^*

Jorge C. Romão^†

Martin Hirsch^‡

Michal Malinský^§

Departamento de Física and CFTP, Instituto Superior Técnico Universidade de Lisboa, Avenida Rovisco Pais 1, 1049-001 Lisboa, Portugal and AHEP Group, Instituto de Física Corpuscular–C.S.I.C./Universitat de València Edificio de Institutos de Paterna, Apartado 22085, E–46071 València, Spain

Departamento de Física and CFTP, Instituto Superior Técnico Universidade de Lisboa, Avenida Rovisco Pais 1, 1049-001 Lisboa, Portugal

AHEP Group, Instituto de Física Corpuscular–C.S.I.C./Universitat de València Edificio de Institutos de Paterna, Apartado 22085, E–46071 València, Spain

Institute of Particle and Nuclear Physics, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 180 00 Praha 8, Czech Republic

^*carolina@ific.uv.es
^†jorge.romao@tecnico.ulisboa.pt
^‡mahirsch@ific.uv.es
^§malinsky@ipnp.troja.mff.cuni.cz

Phys. Rev. D 89, 035002 – Published 7 February, 2014

DOI: https://doi.org/10.1103/PhysRevD.89.035002

Abstract

We construct a comprehensive list of nonsupersymmetric standard model extensions with a low-scale left-right (LR)-symmetric intermediate stage that may be obtained as simple low-energy effective theories within a class of renormalizable $S O (10)$ grand unified theories. Unlike the traditional “minimal” LR models many of our example settings support a perfect gauge coupling unification even if the LR scale is in the LHC domain at a price of only (a few copies of) one or two types of extra fields pulled down to the TeV-scale ballpark. We discuss the main aspects of a potentially realistic model building conforming the basic constraints from the quark and lepton sector flavor structure, proton decay limits, etc. We pay special attention to the theoretical uncertainties related to the limited information about the underlying unified framework in the bottom-up approach, in particular, to their role in the possible extraction of the LR-breaking scale. We observe a general tendency for the models without new colored states in the TeV domain to be on the verge of incompatibility with the proton stability constraints.

Article Text

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