The baryogenesis window in the MSSM.

Journal Article · Fri May 01 04:00:00 EDT 2009 · Nucl. Phys. B

DOI:https://doi.org/10.1016/j.nuclphysb.2008.12.014· OSTI ID:949186

Carena, M; Nardini, G; Quiros, M; FNAL,; CERN,

Electroweak baryogenesis provides an attractive explanation of the origin of the matter-antimatter asymmetry that relies on physics at the weak scale and thus it is testable at present and near future high-energy physics experiments. Although this scenario may not be realized within the Standard Model, it can be accommodated within the MSSM provided there are new CP-violating phases and the lightest stop mass is smaller than the top-quark mass. In this work we provide an evaluation of the values of the stop (m{sub i}) and Higgs (m{sub H}) masses consistent with the requirements of electroweak baryogenesis based on an analysis that makes use of the renormalization group improved Higgs and stop potentials, and including the dominant two-loop effects at high temperature. We find an allowed window in the (m{sub i}, m{sub H})-plane, consistent with all present experimental data, where there is a strongly first-order electroweak phase transition and where the electroweak vacuum is metastable but sufficiently long-lived. In particular we obtain absolute upper bounds on the Higgs and stop masses, m{sub H} {approx}< 127 GeV and m{sub i} {approx}< 120 GeV, implying that this scenario will be probed at the LHC.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 949186
• Report Number(s): ANL-HEP-PR-08-33
• Journal Information: Nucl. Phys. B, Journal Name: Nucl. Phys. B Journal Issue: 1-2 ; May 2009 Vol. 812
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
EVALUATION
ORIGIN
PHYSICS
RENORMALIZATION
STANDARD MODEL