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Systematic approach to thermal leptogenesis

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons37611

Frossard,  Tibor
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30655

Kartavtsev,  Alexander
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Citation

Frossard, T., Garny, M., Hohenegger, A., Kartavtsev, A., & Mitrouskas, D. (2013). Systematic approach to thermal leptogenesis. Physical Review D, 87(08): 085009, pp. 1-39. doi:10.1103/PhysRevD.87.085009.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-F621-A
Abstract
In this work we study thermal leptogenesis using nonequilibrium quantum field theory. Starting from fundamental equations for correlators of the quantum fields we describe the steps necessary to obtain quantum-kinetic equations for quasiparticles. These can easily be compared to conventional results and overcome conceptional problems inherent in the canonical approach. Beyond CP-violating decays we include also those scattering processes which are tightly related to the decays in a consistent approximation of fourth order in the Yukawa couplings. It is demonstrated explicitly how the S-matrix elements for the scattering processes in the conventional approach are related to two- and three-loop contributions to the effective action. We derive effective decay and scattering amplitudes taking medium corrections and thermal masses into account. In this context we also investigate CP-violating Higgs decay within the same formalism. From the kinetic equations we derive rate equations for the lepton asymmetry improved in that they include quantum-statistical effects and medium corrections to the quasiparticle properties.