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Published May 2014 | Published + Submitted
Journal Article Open

Cuts, cancellations and the closed time path: The soft leptogenesis example


By including all leading quantum-statistical effects at finite temperature, we show that no net asymmetry of leptons and sleptons is generated from soft leptogenesis, save the possible contribution from the resonant mixing of sneutrinos. This result contrasts with different conclusions appearing in the literature that are based on an incomplete inclusion of quantum statistics. We discuss vertex and wave-function diagrams as well as all different possible kinematic cuts that nominally lead to CP-violating asymmetries. The present example of soft leptogenesis may therefore serve as a paradigm in order to identify more generally applicable caveats relevant to alternative scenarios for baryogenesis and leptogenesis, and it may provide useful guidance in constructing viable models.

Additional Information

© 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/). Funded by SCOAP^3. Received 22 July 2013; received in revised form 28 January 2014; accepted 10 February 2014. Available online 15 February 2014. The authors are grateful to Apostolos Pilaftsis and Daniel Chung for discussions regarding the importance of RIS subtraction. B.G. acknowledges support by the Gottfried Wilhelm Leibniz programme of the Deutsche Forschungsgemeinschaft and by the D.F.G. Cluster of Excellence 'Origin and Structure of the Universe'. M.J.R.M. was supported in part by U.S. Department of Energy contract DE-FG02-08ER41531 and by the Wisconsin Alumni Research Foundation. M.J.R.M. also thanks the Excellence Cluster Universe and Technical University München for their hospitality during completion of a portion of this work.

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Published - 1-s2.0-S0550321314000480-main.pdf

Submitted - 1307.0524v1.pdf


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