ACP Seminar (Astronomy - Cosmology - Particle Physics)

Speaker: Kazuo Fujikawa (Mathematical Physics Laboratory, RIKEN Nishina Center)
Title: Lorentz invariant CPT violation and neutrino-antineutrino mass splitting in the Standard Model
Date (JST): Wed, Dec 19, 2012, 14:00 - 15:00
Place: Seminar Room A
Related File: 846.pdf
Abstract: The interpretation of neutrino oscillation data has led to the question whether, in principle, an antiparticle like antineutrino can have a different mass than its particle. We present an explicit Lagrangian model for the fermion and antifermion mass splitting in the framework of a Lorentz invariant CPT violation. This Lorentz invariant CPT violation, which is based on non-local interactions, is naturally incorporated in the Higgs coupling to neutrinos in the Standard Model, without spoiling the basic $SU(2)_{L}xU(1)$ gauge symmetry. The neutrino--antineutrino mass splitting is thus realized by the proposed mechanism, assuming the neutrino masses to be predominantly Dirac-type in the Standard Model. Some of the implications of the model and remaining theoretical issues are discussed.
Remarks: References:
M. Chaichian, K. Fujikawa and A. Tureanu;
1. "Lorentz invariant CPT violation: Particle and antiparticle mass splitting", Phys.Lett. B712 (2012) 115,
2. "On neutrino masses via CPT violating Higgs interaction in the Standard Model", Phys.Lett. B718 (2012) 178,
3. "Electromagnetic interaction in theory with Lorentz invariant CPT violation", (to appear in PLB), arXiv:1210.0208 [hep-th].