Testing Electroweak Baryogenesis with Future Colliders

Abstract

Electroweak Baryogenesis (EWBG) is a compelling scenario for explaining the matter-antimatter asymmetry in the universe. Its connection to the electroweak phase transition makes it inherently testable. However, completely excluding this scenario can seem difficult in practice, due to the sheer number of proposed models. We investigate the possibility of postulating a "no-lose" theorem for testing EWBG in future e+e- or hadron colliders. As a first step we focus on a factorized picture of EWBG which separates the sources of a stronger phase transition from those that provide new sources of CP violation. We then construct a "nightmare scenario" that generates a strong first-order phase transition as required by EWBG, but is very difficult to test experimentally. We show that a 100 TeV hadron collider is both necessary and possibly sufficient for testing the parameter space of the nightmare scenario that is consistent with EWBG.

26 pages + references, 10 figures. Fixed minor typos, updated TLEP and 100 TeV projections. Conclusions unchanged

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• Baryogenesis and Gravitational Waves from Runaway Bubble Collisions
• The Relic Neutralino Surface at a 100 TeV collider
• Running Electroweak Couplings as a Probe of New Physics
• Neutralinos in Vector Boson Fusion at High Energy Colliders
• The minimal fermionic model of electroweak baryogenesis
• Prospects for observing charginos and neutralinos at a 100 TeV proton-proton collider
• The Higgs Portal Above Threshold
• Dark Matter Signals in Dilepton Production at Hadron Colliders
• Improving Higgs coupling measurements through ZZ Fusion at the ILC
• Disfavouring Electroweak Baryogenesis and a hidden Higgs in a CP-violating Two-Higgs-Doublet Model
• Proton annihilation at hadron colliders and Kamioka: high-energy versus high-luminosity
• Gravitational waves from the first order electroweak phase transition in the $Z_3$ symmetric singlet scalar model
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