A Simulation of Gauge Mediated Supersymmetry Breaking with stau as the NLSP in the ATLAS detector

The feasibility for mass measurements of SUSY particles from GMSB models with stau as the NLSP in the ATLAS detector is studied using parameterized simulations. The measured particles are selected such that model parameters can be estimated

Estimation techniques for instrumental backgrounds at the LHC

Backgrounds induced by the detector and its environment in high energy hadron collisions are present in all measurements at the LHC, and they can in many cases be significant. Experimental techniques are presented that use data to measure these backgrounds, minimize their impact, and derive corrections that can be applied to top physics measurements

Prospects for Top Mass Measurements at the LHC

The prospects for top mass measurements at the LHC are summarised. Some experimental techniques that have been exploited so far are outlined

Boosted tops: Physics and reconstruction

The production of boosted top quarks in the high centre-of-mass energy collisions at the LHC is a probe to new phenomena at the TeV scale. Numerous extensions to the Standard Model (SM) predict massive particles whose couplings to top quarks are enhanced. Such massive particles, referred as t¯t resonances, will distort the t¯t invariant mass spectrum relative to the SM expectation. This presentation is dedicated to studies performed by the ATLAS and CMS Collaborations. New techniques were developed to reconstruct boosted top quarks as single objects, both as a top-tagged jet with a substructure in the hadronic decay mode and a jet with a lepton inside in the leptonic decay mode. These techniques were applied in dedicated analyses to search for high mass t¯t resonances. Expected limits and the potential for observation are presented for a luminosity of few hundreds of pb−1

Penetration of fusidic acid and rifampicin into cerebrospinal fluid in low-grade inflammatory meningitis caused by Staphylococcus epidermidis

AbstractCerebrospinal fluid (CSF) concentration-time curves of rifampicin and fusidic acid were studied in a patient with post-operative meningitis caused by Staphylococcus epidermidis. The patient was treated with this combination of antimicrobial agents because of a severe hypersensitivity reaction to vancomycin. Peak CSF concentrations of rifampicin exceeded the MIC by > 60-fold, while those of fusidic acid just reached the MIC. CSF concentrations of fusidic acid were relatively stable within the range reported for patients with uninflamed meninges, but serum levels were surprisingly low. An increase in the metabolism of fusidic acid induced by rifampicin cannot be excluded

Top mass: prospects at LHC

The prospects of measuring the top mass with high accuracy at LHC is presented. Most of the presented methods make use of simulations equivalent to around 1/fb of collected data. The top mass is a unique reference candle for high mass measurements. Measuring the top mass during and after the LHC commissioning is consequently one of the important milestones on the path to the dicovery of new physics

Early search for supersymmetric dark matter models at the LHC without missing energy

We investigate early discovery signals for supersymmetry at the Large Hadron Collider without using information about missing transverse energy. Instead we use cuts on the number of jets and isolated leptons (electrons and/or muons). We work with minimal supersymmetric extensions of the standard model, and focus on phenomenological models that give a relic density of dark matter compatible with the WMAP measurements. An important model property for early discovery is the presence of light sleptons, and we find that for an integrated luminosity of only 200--300 pb$^{-1}$ at a center-of-mass energy of 10 TeV models with gluino masses up to $\sim 700$ GeV can be tested.Comment: 28 pages, 12 figures; published versio