Phenomenology of flavon fields at the LHC

Abstract

We study low energy constraints from flavour violating processes, production and decay at the LHC of a scalar field varphi (flavon) associated to the breaking of a non-supersymmetric Abelian family symmetry at the TeV scale. This symmetry is constrained to reproduce fermion masses and mixing, up to O(1) coefficients. The non-supersymmetric gauged U(1) models considered are severely restricted by cancellation of anomalies and LEP bounds on contact interactions, consequently its phenomenology is out of the LHC reach. We therefore introduce an effective U(1) which is not gauged and it is broken explicitly by a CP odd term at the TeV scale. This helps us to explore flavour violating processes, production and decay at the LHC for these kind of light scalars. In this context we first study the constraints on the flavon mass and its vacuum expectation value from low energy flavour changing processes such as μ-> eγ. We find that a flavon of about m_ϕ<~ 150 GeV could be experimentally allowed. These kind of flavons could be significantly generated at the LHC via the gluon fusion mechanism and the single top production channel g u -> t ϕ. The produced flavons can have characteristic decay modes such as t \bar{c} for m_ϕ>~ m_t, and τ\barμ for m_ϕ<~ m_t, which could be effectively useful to detect flavons.

41 pages, 6 figures. Replacement that matches the published version, except some minor details about English style, with added references and minor corrections, one figure replaced.

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