# Phenomenology 2014 Symposium

5-7 May 2014
University of Pittsburgh
US/Eastern timezone

## Pseudo-Dirac Gluino Oscillations

5 May 2014, 15:30
15m
Benedum Hall G29 (University of Pittsburgh)

parallel talk

### Speaker

Seyda Ipek (University of Washington)

### Description

In the existence of a slightly broken U(1) symmetry, two (2-component) Weyl spinor parts of a Dirac fermion is split by a small Majorana mass. These fermions are called pseudo-Dirac fermions. The mass splitting gives rise to oscillations between the charge eigenstates, much like neutral meson oscillations. Previously, these oscillations have been considered in mesino - anti-mesino systems. Here we consider pseudo-Dirac gluino oscillations. Pseudo-Dirac gluinos are a feature of some SUSY models with an approximate $U(1)_R$ symmetry. We show that there can be $\mathcal{O}(1)$ CP violation if the decay rate of gluinos are comparable to the oscillation rate. This CP violation can be observed as a like-sign dilepton asymmetry.

### Primary author

Seyda Ipek (University of Washington)

### Co-authors

Ann Nelson (University of Washington) David McKeen (University of Washington)

 Slides