Yongsun Kim

Search for Neutral Minimal Supersymmetric Standard Model Higgs Bosons Decaying to Tau Pairs in pp Collisions at sqrt[s]=7 TeV

A search for neutral MSSM Higgs bosons in pp collisions at the LHC at a center-ofmass energy of 7 TeV is presented. The results are based on a data sample corresponding to an integrated luminosity of 36 pb−1 recorded by the CMS experiment. The search uses decays of the Higgs bosons to tau pairs. No excess is observed in the tau-pair invariant-mass spectrum. The resulting upper limits on the Higgs boson production cross section times branching fraction to tau pairs, as a function of the pseudoscalar Higgs boson mass, yield stringent new bounds in the MSSM parameter space. Submitted to Physical Review Letters ∗See Appendix A for the list of collaboration members ar X iv :1 10 4. 16 19 v1 [ he pex ] 8 A pr 2 01 1

The evolution of FTK, a real-time tracker for hadron collider experiments

We describe the architecture evolution of the highly-parallel dedicated processor FTK, which is driven by the simulation of LHC events at high luminosity (1034 cm-2 s-1). FTK is able to provide precise on-line track reconstruction for future hadronic collider experiments. The processor, organized in a two-tiered pipelined architecture, execute very fast algorithms based on the use of a large bank of pre-stored patterns of trajectory points (first tier) in combination with full resolution track fitting to refine pattern recognition and to determine off-line quality track parameters. We describe here how the high luminosity simulation results have produced a new organization of the hardware inside the FTK processor core.