Observable Effects of General New Scalar Particles

Abstract

We classify all possible new scalar particles that can have renormalizable linear couplings to Standard Model fields and therefore be singly produced at colliders. We show that this classification exhausts the list of heavy scalar particles that contribute at the tree level to the Standard Model effective Lagrangian to dimension six. We compute this effective Lagrangian for a general scenario with an arbitrary number of new scalar particles and obtain flavor-preserving constraints on their couplings and masses. This completes the tree-level matching of the coefficients of dimension five and six operators in the effective Lagrangian to arbitrary extensions of the Standard Model.

21 pages plus appendices, 28 tables. Improved discussion in Section 6. New references and comments. Minor corrections. Matches published version

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• Effective field theory for vector-like leptons and its collider signals
• Flavor physics in SU(5) GUT with scalar fields in the 45 representation
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• Electroweak precision constraints at present and future colliders
• Accessing Masses Beyond Collider Reach - in EFT
• On the reinterpretation of non-resonant searches for Higgs boson pairs