An investigation of observable signatures in ATLAS from LSP decays to the Hidden Valley

We present an ongoing investigation into the observable signatures from the Hidden Valley* model in the ATLAS detector at the Large Hadron Collider. Other recent studies have investigated decays to the Hidden Valley from a Z' or Higgs, however, this study investigates decays through the neutral LSP in supersymmetric scenarios. The neutral Hidden Valley particles may have long lifetimes and thus produce unique challenges in detecting their decays. Using a modified Pythia card created by M. Strassler, we show that the triggers proposed in the Z' and Higgs studies will assist in detecting the LSP decay to Hidden Valley pions. \newline \newline *M. Strassler and K. Zurek, Physics Letters B 651 (2007) 374--379; Physics Letters B, 661 (4), p.263-267