Lepton-flavored electroweak baryogenesis
We explore lepton-flavored electroweak baryogenesis, driven by CP-violation in leptonic Yukawa sector, using the τ−μ system in the two Higgs doublet model as an example. This setup generically yields, together with the flavor-changing decay h→τμ, a tree-level Jarlskog invariant that can drive dynamical generation of baryon asymmetry during a first-order electroweak phase transition and results in CP-violating effects in the decay h→ττ. We find that the observed baryon asymmetry can be generated in parameter space compatible with current experimental results for the decays h→τμ, h→ττ, and τ→μγ, as well as the present bound on the electric dipole moment of the electron. The baryon asymmetry generated is intrinsically correlated with the CP-violating decay h→ττ and the flavor-changing decay h→τμ, which thus may serve as "smoking guns" to test lepton-flavored electroweak baryogenesis.
Additional Information© 2017 American Physical Society. Received 20 January 2017; published 29 December 2017. We would like to thank E. Barberio, W. Chao, C. Y. Seng and D. Zanzi for helpful discussions. M. J. R. M. and H. K. G. are supported in part under U.S. Department of Energy Contract No. DE-SC0011095. H. K. G. is also supported by the China Scholarship Council. J. S. is supported by the National Natural Science Foundation of China (NSFC) under Grant Nos. 11647601, 11690022, and 11675243, and also supported by the Strategic Priority Research Program of the Chinese Academy of Sciences under Grant Nos. XDB21010200 and XDB23030100. Y. Y. L. is supported by the Hong Kong Ph.D. Fellowship Scheme (HKPFS). T. L. is supported by the Collaborative Research Fund (CRF) under Grant No. HUKST4/CRF/13G and the General Research Fund (GRF) under Grant No. 16312716. Both the HKPFS and the CRF, GRF grants are issued by the Research Grants Council of Hong Kong S. A. R. M. J. R. M., T. L., and J. S. would like to thank the hospitality of MIAPP (T. L. would extend the thanks to MITP and Aspen Center for Physics) during the finalization of this article.
Published - PhysRevD.96.115034.pdf
Submitted - 1609.09849.pdf