1,762 research outputs found

    Search for ADD Extra Dimensional Gravity in Dimuon Channel with the CMS Detector

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    In this work a possibility to observe TeV-scale gravity signals at the LHC is discussed. The ADD scenario with large extra dimensions and KK-modes virtual contribution into Drell-Yan processes are considered. A full simulation and reconstruction analysis was carried out to derive the CMS discovery potential for ADD virtual production by studying muon pairs with large invariant masses

    Study of Drell-Yan Di-muon Production with the CMS Detector

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    The potential of the Compact Muon Solenoid (CMS) experiment to measure Drell-Yan muon pairs is studied. The efficiency of Level-1 and High Level Triggers to these events is investigated. Muon pairs can be explored by CMS with high precision up to very high invariant masses. Systematic errors are considered. The possibility of performing precise measurements of the forward-backward asymmetry is discussed

    Search for Randall-Sundrum Graviton Decay into Muon Pairs

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    In this work the study of Randall-Sundrum graviton decay into muon pairs has been performed. A full simulation and reconstruction analysis was carried out to derive both the CMS discovery potential for Randall-Sundrum graviton and spin determination performance in this channel

    Magnetization Dynamics of Iron Garnet Crystals in Oscillating Magnetic Field

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    AbstractUsing direct observations via stroboscopic technique it is shown that in iron garnet crystals placed in an alternating magnetic field aligned perpendicular to the plane of the sample the dynamic magnetization reversal is carried out by the oscillations of the domain walls with their subsequent drift. For the first time the dependences of the maximum speed of domain walls motion during oscillations Vosc and of the domain walls oscillations amplitude Aosc in external oscillating magnetic field on amplitude of the external magnetic field H0 are obtained. It is shown that these dependences can be approximated by linear functions. Numerical simulations of domain walls motion in an alternating magnetic field were performed with parameters of the real sample. It is established that the experimental dependences Vosc(H0) and Aosc(H0) at different frequencies are in a qualitative agreement with the results of numerical simulations

    Design, Performance, and Calibration of CMS Hadron Endcap Calorimeters

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    Detailed measurements have been made with the CMS hadron calorimeter endcaps (HE) in response to beams of muons, electrons, and pions. Readout of HE with custom electronics and hybrid photodiodes (HPDs) shows no change of performance compared to readout with commercial electronics and photomultipliers. When combined with lead-tungstenate crystals, an energy resolution of 8\% is achieved with 300 GeV/c pions. A laser calibration system is used to set the timing and monitor operation of the complete electronics chain. Data taken with radioactive sources in comparison with test beam pions provides an absolute initial calibration of HE to approximately 4\% to 5\%

    Penilaian Kinerja Keuangan Koperasi di Kabupaten Pelalawan

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    This paper describe development and financial performance of cooperative in District Pelalawan among 2007 - 2008. Studies on primary and secondary cooperative in 12 sub-districts. Method in this stady use performance measuring of productivity, efficiency, growth, liquidity, and solvability of cooperative. Productivity of cooperative in Pelalawan was highly but efficiency still low. Profit and income were highly, even liquidity of cooperative very high, and solvability was good

    Differential cross section measurements for the production of a W boson in association with jets in proton‚Äďproton collisions at ‚ąös = 7 TeV