Measurements of the jet energy calibration and transverse momentum resolution in CMS are presented, performed with a data sample collected in proton-proton collisions at a centreof-mass energy of 7 TeV, corresponding to an integrated luminosity of 36 pb −1. The transverse momentum balance in dijet and γ/Z+jets events is used to measure the jet energy response in the CMS detector, as well as the transverse momentum resolution. The results are presented for three different methods to reconstruct jets: a calorimeter-based approach, the "Jet-Plus-Track" approach, which improves the measurement of calorimeter jets by exploiting the associated tracks, and the "Particle Flow" approach, which attempts to reconstruct individually each particle in the event, prior to the jet clustering, based on information from all relevant subdetectors. KEYWORDS: Si microstrip and pad detectors; Calorimeter methods; Detector modelling and simulations I (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc) ARXIV EPRINT: 1107.4277
A complete vacuum UV spectrophotometric device, including the source and a computerized data acquisition system, for both reflectance and transmittance measurements in the 105-200-nm wavelength range is described. The apparatus is suitable for various experimental situations such as measurements in the -200 to +100 degrees C temperature range for gases, liquids, and solids (for gases and liquids within the 0-150 bar pressure range). Drift of 0.07% per day for ambient temperature measurements and absolute reflectance as low as 0.05% are reported, illustrating the high performance reached. The setup is particularly well suited for long cycles of low temperature, high pressure experiments.
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