CP Violation in Pseudo-Dirac Fermion Oscillations

Abstract

Supersymmetric theories with a $U(1{)}_R$ symmetry have Dirac gauginos, solve the supersymmetric flavor and CP problems, and have distinctive collider signatures. However when supergravity is included, the $U(1{)}_R$ must be broken, adding small Majorana mass terms which split the mass of the two components of the Dirac gaugino and lead to oscillations between $U(1{)}_R$ charge eigenstates. We present a general study of fermion-antifermion oscillations in this system, including the effects of decays and CP violation. We consider the effects of such oscillations in the case where the two $U(1{)}_R$ charge eigenstates can decay into the same final state, and show that $O(1)$ CP violation is allowed. In the case of decays into final states containing leptons such CP violation can be observed as a same sign dilepton asymmetry.

12 pages, 4 figures, v2: references added, typos corrected

References in corpus (8)

• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• Improved limit on the permanent electric dipole moment of 199Hg
• Threshold resummation for squark-antisquark and gluino-pair production at the LHC
• Soft gluon resummation for the production of gluino-gluino and squark-antisquark pairs at the LHC
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• Electric Dipole Moments in the MSSM Reloaded
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• A Supersymmetric One Higgs Doublet Model

Cited by in corpus (2)

• Baryogenesis from Oscillations of Charmed or Beautiful Baryons
• Constrained Dirac gluino mediation