1,855 research outputs found

    First measurement of tW production cross-section at s\sqrt s~= 13 TeV with CMS

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    The inclusive cross-section for tW production in proton-proton collisions at s=13\sqrt{s} = 13 TeV is measured for an integrated luminosity of 35.9 fb−1^{-1} collected by the CMS experiment. The measurement is performed using events with one electron and one muon in the final state and at least one b-quark jet, and utilises kinematic differences between the signal and the dominating ttˉt\bar{t} background using multivariant discriminants which is designed to disentangle the two processes. The measured cross-section of σ=63.1±1.8 (stat)±6.4 (syst)±2.1 (lumi)\sigma = 63.1 \pm 1.8~({\rm stat}) \pm 6.4~({\rm syst}) \pm 2.1~({\rm lumi}) pb is observed to be in agreement with the Standard Model.Comment: 5 pages, 3 figures, This conference proceeding is based on the poster presented at International Workshop on Top Quark Physics, Bad Neuenahr, Germany, September 16--21, 201

    ANCIENT METHODS OF RESEARCH IN AYURVEDA

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    Ayurveda is the Upaveda of Atharvaveda, the ancient literature which gave us the knowledge of healthier life. The absolute aim of Ayurveda is to maintain the health of a healthier person and diagnose and treat the diseased person. Ayurveda has the ability to treat many chronic diseases that are untreatable in modern medicine, it has got some very preventive and curative tools to treat the diseases, but unfortunately, due to the lack of scientific validation in various concepts, this precious gift from our ancestors is trailing. In a nutshell, Ayurveda gives human a healthy life with proven methods of medical treatment. The ancient methods of treatment are very effective and relevant in present time also. Hence, evidence-based research is highly needed for global recognition and acceptance of Ayurveda, which needs further advancements in the research methodology

    Development of Silicon Sensor Characterization System for Future High Energy Physics Experiments

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    The Compact Muon Solenoid (CMS) is one of the general purpose experiments at the Large Hadron Collider (LHC), CeRN and has its tracker built of all silicon strip and pixel sensors. Si sensors are expected to play extremely important role in the upgrades of the existing tracker for future high luminosity environment and will also be used in future lepton colliders. however, properties of the silicon sensors have to be carefully understood before they can be put in the extremely high luminosity condition. At Delhi university (DU), we have been working on the development of Si sensor characterization system, as part of the collaboration with the CMS experiment and RD50 collaboration. this works reports the installation of current-voltage (I-V) and capacitance-voltage (C-V) systems at DU

    Study of adaptive alignment as beam based alignment in ILC Main Linac in the presence of ground motion

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    In this work we present simulation results on the effect of ground motion on the main linac performance of the proposed International Linear Collider (ILC), and then use adaptive alignment (AA) technique to correct it. The adaptive alignment technique is investigated for the ILC main linac and its limitations are studied. Then ground motion studies are performed using the simulation program LIAR and the beneficial effects of implementing AA algorithm are further discussed

    Influence of ground-granulated blast-furnace slag on the structural performance of self-compacting concrete

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    In the last decades, the utilization of industrial waste like ground-granulated blast-furnace slag (GGBFS) has proven itself a great asset in the modern construction industry. Aiming at promoting the green housing initiatives, the present study focused on the study of the influence of GGBFS on the structural performance of self-compacting concrete (SCC). In the initial phase of the extensive experimental program, concrete cubes were prepared with the partial replacements of GGBFS (10%, 15%, 20%, 25%, and 30% with cement) and tested against the control mix in order to investigate the associated mechanical properties (compressive strength, tensile splitting strength, and flexural strength). At 20% GGBFS replacement, the optimum compressive strength was noted, and further addition of GGBFS caused a gradual decrease in the mechanical strength properties. This study further investigated the structural properties like axial load-displacement behavior and failure pattern of RC columns and flexural performance of RC slabs with and without the addition of GGBFS. SCC with 20% GGBFS demonstrated relatively better structural performance, causing the formation of smaller crack width/depth/length compared with the control mix. An empirical relationship was also proposed based on the experimental test results (in relation to the mechanical properties) in line with US and Indian standards code of practice

    Benchmarking/Crosschecking DFS in the ILC Main Linac

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    Abstract In an effort to compare beam dynamics and create a "benchmark" for Dispersion Free Steering (DFS) a comparison was made between different ILC simulation programs while performing DFS. This study consisted of three parts. First, a simple betatron oscillation was tracked through each code. Secondly, a set of component misalignments and corrector settings generated from one program was read into the others to confirm similar emittance dilution. Thirdly, given the same set of component misalignments DFS was performed independently in each program and the resulting emittance dilution was compared. Performance was found to agree exceptionally well in all three studies

    Energy Resolution Performance of the CMS Electromagnetic Calorimeter

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    The energy resolution performance of the CMS lead tungstate crystal electromagnetic calorimeter is presented. Measurements were made with an electron beam using a fully equipped supermodule of the calorimeter barrel. Results are given both for electrons incident on the centre of crystals and for electrons distributed uniformly over the calorimeter surface. The electron energy is reconstructed in matrices of 3 times 3 or 5 times 5 crystals centred on the crystal containing the maximum energy. Corrections for variations in the shower containment are applied in the case of uniform incidence. The resolution measured is consistent with the design goals
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