Various new physics models, e.g., theories of compositeness, can accommodate the color singlet excited leptons that interact with the leptons, quarks, leptoquarks, etc. A particular type of excited lepton, which can be produced through the four-fermion interaction with a lepton and quark-antiquark (or lepton-antilepton) pair, we call a leptomeson. These new particles may contribute to a variety of experimental anomalies such as the discrepancy in the muon $g-2$. We propose that the leptomesons also can generate the baryon asymmetry that explains the imbalance in ordinary matter and antimatter in the observable Universe. We consider the two types of scenarios for this baryogenesis via leptogenesis to occur from either leptomeson oscillations or decays. Neither possibility contradicts the small masses of the observable neutrinos and the proton stability. Moreover, they can be relevant for the near-future collider experiments and do not suffer from the gravitino problem.

• Received 29 April 2016

DOI:https://doi.org/10.1103/PhysRevD.94.035007