Phenomenology of flavon fields at the LHC

Koji Tsumura, Liliana Velasco-Sevilla

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30 Citations (Scopus)


We study low energy constraints from flavor violating processes, production, and decay at the LHC of a scalar field φ (flavon) associated to the breaking of a nonsupersymmetric Abelian family symmetry at the TeV scale. This symmetry is constrained to reproduce fermion masses and mixing, up to O(1) coefficients. The nonsupersymmetric 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 is broken explicitly by a CP-odd term at the TeV scale. This helps us to explore flavor 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 flavor changing processes such as μ→eγ. We find that a flavon of about mφ 150GeV could be experimentally allowed. These kinds of flavons could be significantly generated at the LHC via the gluon fusion mechanism and the single top production channel gu→tφ. The produced flavons can have characteristic decay modes such as tc̄ for mφ mt, and τμ̄ for mφ mt, which could be effectively useful to detect flavons.

Original languageEnglish
Article number036012
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number3
Publication statusPublished - Feb 24 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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