Dear all,
I am very happy to tell you that I will be presenting my master thesis on Thursday June 20! I have searched for long-lived neutralinos and, unfortunately, not found any. Nevertheless, I would very much appreciate your presence during the presentation at 15:00 in H331 at Nikhef.
Cheers, Suzanne
*A Search for Long-Lived Neutralinos at LHCb:*
Supersymmetric (SUSY) extensions of the Standard Model (SM) predict the existence of neutral fermions called neutralinos. A search is performed for neutralinos in the scenario of an R-parity violating model, in which supersymmetry is broken through gravitational interactions (BRpV-mSUGRA). The LSP is the neutralino and has a 71.2 ps lifetime, decaying into SM particles. We present the search for long-lived neutralinos using the 2011 data set of the LHCb detector at CERN in pp collisions at \sqrt{s}=7 TeV, with an integrated luminosity of 1.0 fb^{-1}. We look for a signature with a displaced vertex with two jets and a muon. By performing a cut-based analysis, an upper limit is set on 2 \times \sigma \times BR < 3.3 pb at 95% confidence level, with a relative systematic uncertainty of 8.3%. This corresponds to approximately 7 times the predicted SUSY cross section.