71 research outputs found

    Systematically Searching for New Resonances at the Energy Frontier using Topological Models

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    We propose a new strategy to systematically search for new physics processes in particle collisions at the energy frontier. An examination of all possible topologies which give identifiable resonant features in a specific final state leads to a tractable number of `topological models' per final state and gives specific guidance for their discovery. Using one specific final state, jj\ell\ell jj, as an example, we find that the number of possibilities is reasonable and reveals simple, but as-yet-unexplored, topologies which contain significant discovery potential. We propose analysis techniques and estimate the sensitivity for pppp collisions with s=14\sqrt{s}=14 TeV and L=300\mathcal{L}=300 fb1^{-1}

    Study Of The Response Of The ATLAS Tile Calorimeter To Muons Produced In s\sqrt{s} = 7 Tev Proton-proton Collisions At The LHC

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    The purpose of this study is to verify the inter-calibration of the cells and uniformity of the Tile Calorimeter (TileCal) detector in the ATLAS experiment at CERN. The response using muons produced in proton-proton collisions at s\sqrt{s}= 7 TeV is identified. Muons are efficient calibration tools because they are minimum ionizing particles that deposit nearly constant energy in the calorimeter for a wide range of particle energies. In this study, the tracks of the muons are extrapolated through the calorimeter, and their path lengths through TileCal cells are calculated. The energy, path length, and dE/dx response of the cells are determined. The dE/dx response of each layer and tower is then analyzed for uniformity and compared to Monte Carlo data.Once this has been done, the yield of individual cells is determined by analyzing the number of photo-electrons produced by the muons traversing the scintillating material of the cell

    Probing the Strength of Non-Standard Interactions Between Solar Neutrinos and Up or Down Quarks in Matter Using Recoil Electron Spectra Measured by Super-Kamiokande

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    Non-Standard Interactions (NSI) between neutrinos and matter affect neutrino flavor oscillations.Due to the high matter density in the core of the Sun, solar neutrinos are well suited to probe these interactions.Using the 277 kton-yr exposure of Super-Kamiokande to 8^{8}B solar neutrinos, we search for the presence of NSI.Our data favors the presence of NSI with down quarks at 1.8σ\sigma, and with up quarks at 1.6σ\sigma, with the best-fit effective NSI parameters being (ϵ11d,ϵ12d\epsilon_{11}^{\textrm{d}},\epsilon_{12}^{\textrm{d}}) = (-3.3, -3.1) for d-quarks and (ϵ11u,ϵ12u\epsilon_{11}^{\textrm{u}},\epsilon_{12}^{\textrm{u}}) = (-2.5, -3.1) for u-quarks.After combining with data from the Sudbury Neutrino Observatory and Borexino, the significance increases by 0.1σ\sigma


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    Three experiments tested the hypothesis that habituation contributes to the regulation of wheel running. Rats ran in a wheel for 30‐min sessions. Experiment 1 demonstrated spontaneous recovery. Rats ran more and the within‐session decreases in running were smaller after 2 days of wheel deprivation than after 1 day. Experiment 2 demonstrated dishabituation. Running rate increased immediately after the termination of a brief extra event (application of the brake or flashing of the houselight). Experiment 3 demonstrated stimulus specificity. Rats completed the second half of the session in either the same wheel as the first half, or a different wheel. Second‐half running was faster in the latter case. Within‐session patterns of running were well described by equations that describe data from the habituation, motivation, and operant literatures. These results suggest that habituation contributes to the regulation of running. In fact, habituation provides a better explanation for the termination of wheel running than fatigue, the variable to which this termination is usually attributed. Overall, the present findings are consistent with the proposition that habituation and sensitization contribute to the regulation of several forms of motivated behavior