Search for pair production of long-lived heavy charged stau particles with LHCb

The minimal Gauge Mediated Supersymmetry Breaking (mGMSB) model predicts that the next-to-lightest Supersymmetric Particle is the $stau$, the charged, massive, and long-lived bosonic super-partner to the tau. We have analysed data collected at the LHCb experiment in 2011 and 2012 corresponding to a total of about 3 fb$^{−1}$, searching for pairs of particles which can be identified as staus with masses between 124 and 309 GeV/c$^2$. A neural network was used to distinguish staus from muons. No evidence is observed for the production of such long-lived states. Upper limits on the di-stau production cross-section are set.