Attempts at Explaining the NuTeV Observation of Di-Muon Events

Preprint
Publisher Website
Google Scholar
  • 18 June 2001
Abstract
The NuTeV Collaboration has observed an excess in their di-muon channel, possibly corresponding to a long-lived neutral particle with only weak interactions and which decays to muon pairs. We show that this can not be explained by pair production of neutralinos in the target followed by their decay far downstream in the detector via a LLE R-parity violating (RPV) operator, as suggested in the literature. In the parameter region allowed by LEP the event rate is far too small. We propose instead a new neutralino production method via the production of B-mesons. This is analogous to neutrino production via pi-mesons. This model can be tested with NOMAD data at the current and future B-factories. This opens up a new way of testing a long-lived neutralino LSP at fixed-target experiments and thus a possibility to close the gap between collider and cosmological tests of R-parity violation. We also discuss a possible explanation in terms of a neutral heavy lepton mixing with the Standard Model neutrinos. The flavour structure of the observation can be accounted for but the production rate is far too low.

This publication has 0 references indexed in Scilit: