# State-of-the-Art Tests of Lepton Number Violation and Seesaw Mechanisms

#### State-of-the-Art Tests of Lepton Number Violation and Seesaw Mechanisms

- Event time: 2:00pm
- Event date: 9th September 2014
- Speaker: Richard Ruiz (University of Durham)
- Location: Higgs Centre Seminar Room, Room 4305, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB

### Event details

The discoveries of nonzero neutrino masses and a SM-like Higgs force us to contemplate that Yukawa couplings may span at least 12 order of magnitude. However, permitting that lepton number is not a fundamental symmetry of nature at low energies, Seesaw mechanisms can alleviate this problem.This talk will focus on recent developments of two tests that directly probe the large class of Seesaw models that feature a heavy neutrino (Dirac, Pseudo-Dirac, or Majorana), in particular: heavy neutrino production via a resonant, s-channel W' (with arbitrary chiral couplings) and through W-photon fusion. The discovery potential of these production modes at current and future hadron colliders will be discussed in detail. Recent LHC results will also be addressed.

### About Particle Physics Theory seminars

The Particle Physics Theory seminar is a weekly series of talks reflecting the diverse interests of the group. Topics include analytic and numerical calculations based on the Standard Model of elementary particle physics, theories exploring new physics, as well as more formal developments in gauge theories and gravity..