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Published January 4, 2010 | Published
Journal Article Open

MSSM baryogenesis and electric dipole moments: an update on the phenomenology


We explore the implications of electroweak baryogenesis for future searches for permanent electric dipole moments in the context of the minimal supersymmetric extension of the Standard Model (MSSM). From a cosmological standpoint, we point out that regions of parameter space that over-produce relic lightest supersymmetric particles can be salvaged only by assuming a dilution of the particle relic density that makes it compatible with the dark matter density: this dilution must occur after dark matter freeze-out, which ordinarily takes place after electroweak baryogenesis, implying the same degree of dilution for the generated baryon number density as well. We expand on previous studies on the viable MSSM regions for baryogenesis, exploring for the first time an orthogonal slice of the relevant parameter space, namely the (tan β, m_A) plane, and the case of non-universal relative gaugino-higgsino CP violating phases. The main result of our study is that in all cases lower limits on the size of the electric dipole moments exist, and are typically on the same order, or above, the expected sensitivity of the next generation of experimental searches, implying that MSSM electroweak baryogenesis will be soon conclusively tested.

Additional Information

© 2010 Springer. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. Received: 28 October 2009. Revised: 24 November 2009. Accepted: 1 December 2009. Published online: 4 January 2010. We thank Sean Tulin for discussions and for providing help with part of the numerical results. The work of VC is supported by the Nuclear Physics Office of the U.S. Department of Energy under Contract No. DE-AC52- 06NA25396 and by the LDRD program at Los Alamos National Laboratory. MJRMand YL were supported in part by U.S. Department of Energy contract DE-FG02-08ER41531 and by the Wisconsin Alumni Research Foundation. MJRM also thanks the Aspen Center for Physics and TRIUMF Theory Group where part of this work was completed. S.P. is partly supported by an Outstanding Junior Investigator Award from the U.S. Department of Energy, Office of Science, High Energy Physics, DoE Contract DEFG02-04ER41268, and by NSF Grant PHY-0757911.

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