SUSY → ττ → h ± + h ∓ + X channel , its advantages and potential instrumental drawbacks

We present a first study of the channel H, A → τ τ → h ± + h ∓ + X in CMS at high mA values where no triggering difficulties are expected with QCD jets. At present the τ selection is based solely on the presence of a hard isolated track in the " τ " jet, but further refinements based on calorimeter collimation or impact parameter selections are obviously possible. The main irreducible background in these conditions is due to QCD jets with hard fragmentations. A large reduction of this background and improvement in the expected signal to background ratio is provided by E miss t cuts. The expected high-mass reach in the mA, tanβ parameter space for 3 × 10 4 pb −1 is shown. This H → τ τ channel provides the highest mass reach and the best mass resolution when compared to τ τ → l ± + h ∓ + X and τ τ → e ± + µ ∓ + X final states. To the extent that with further calorimetric and impact parameter based selection criteria the QCD background can be kept under control, i.e. below the irreducible Z, γ * → τ τ background, we should strive to have a first level trigger allowing to explore the mass range down to ∼150-200 GeV.