Search for R-parity Violating Decays of tau Sneutrinos to emu, mutau, and etau Pairs in ppbar Collisions at sqrt(s) = 1.96 TeV

TL;DR

This paper searches for tau sneutrino particles decaying into different-flavor lepton pairs in proton-antiproton collisions, setting limits on production rates and RPV couplings based on Tevatron data.

Contribution

First search for tau sneutrino decays to mixed-flavor leptons in ppbar collisions, constraining RPV supersymmetric models with Tevatron data.

Findings

No excess observed over standard model predictions.

Upper limits set on tau sneutrino production cross section and branching ratios.

Constraints placed on RPV couplings as a function of sneutrino mass.

Abstract

We present a search for tau sneutrino production using the Tevatron ppbar collision data collected with the CDF II detector and corresponding to an integrated luminosity of 1 fb^-1. We focus on the scenarios predicted by the R-parity violating (RPV) supersymmetric models in which tau sneutrinos decay to two charged leptons of different flavor. With the data consistent with the standard model expectations, we set the upper limits on sigma(ppbar -> tau sneutrino)*BR(tau sneutrino ->emu,mutau,etau) and use these results to constrain the RPV couplings as a function of tau sneutrino mass.