Standard Model couplings and collider signatures of a light scalar

Abstract

The electroweak symmetry breaking (EWSB) sector of the Standard Model can be far richer and more interesting than the usual single scalar doublet model. We explore scenarios where the EWSB sector is nearly scale invariant and consequently gives rise to a light CP even scalar particle. The one-doublet SM is in that category, as are many other models with either weakly or strongly coupled sectors that trigger EWSB. We study the couplings of the light scalar to the SM particles that can arise from the explicit breaking of scale invariance focusing on the possible differences with the minimal SM. The couplings of the light scalar to light fermions, as well as to the massless gauge bosons, can be significantly enhanced. We find possible new discovery channels due to the decays of the conformal scalar into e^+e^- and mu^+mu^- pairs as well as new production channels via light quark annihilation.

10 pages, 7 figures

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Cited by in corpus (10)

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• Tasi 2009 lectures: The Higgs as a Composite Nambu-Goldstone Boson
• A Light Dilaton in Walking Gauge Theories
• Electroweak Symmetry Breaking and the Higgs Boson: Confronting Theories at Colliders
• Phenomenology of a light scalar: the dilaton
• A Very Light Dilaton
• Spin-2 Resonances in Vector-Boson-Fusion Processes at NLO QCD
• Determination of SU(4)${}_{TC}$ Technicolor Gauge Group from Embedding in Extended Technicolor
• Constraints on the Unhiggs Model from Top Quark Decay
• Peccei-Quinn violating minimal supergravity and a 126 GeV Higgs