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Published July 1, 2015 | Submitted
Journal Article Open

Baryon number violation via Majorana neutrinos in the early Universe, at the LHC, and deep underground

Abstract

We propose and investigate a novel, minimal, and experimentally testable framework for baryogenesis, dubbed dexiogenesis, using baryon number violating effective interactions of right-handed Majorana neutrinos responsible for the seesaw mechanism. The distinct LHC signature of our framework is same-sign top quark final states, possibly originating from displaced vertices. The region of parameters relevant for LHC phenomenology can also yield concomitant signals in nucleon decay experiments. We provide a simple ultraviolet origin for our effective operators, by adding a color-triplet scalar, which could ultimately arise from a grand unified theory.

Additional Information

© 2015 American Physical Society. (Received 8 May 2015; published 17 July 2015) We would like to thank B. Dev, P. Meade, R. Mohapatra, and G. Senjanović for discussions. We also thank B. Dev and R. Mohapatra for informing us of their forthcoming paper on related topics [40]. The work of H. D. is supported in part by the United States Department of Energy under Contract No. DE-SC0012704. The work of Y. Z. is supported by the Gordon and Betty Moore Foundation through Grant No. 776 to the Caltech Moore Center for Theoretical Cosmology and Physics, and by DOE Grant No. DE-FG02-92ER40701, and also by a DOE Early Career Award under Grant No. DE-SC0010255. Y. Z. thanks the BNL theory group for hospitality at the final stage of this paper.

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