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Register a new userPrecision Measurement of Energy and Position Resolutions of the BTeV Electromagnetic Calorimeter Prototype
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The energy dependence of the energy and position resolutions of the electromagnetic calorimeter prototype made of lead tungstate crystals produced in Bogoroditsk (Russia) and Shanghai (China) is presented. These measurementswere carried out at the Protvino accelerator using a 1 to 45 GeV electron beam. The crystals were coupled to photomultiplier tubes. The dependence of energy and position resolutions on different factors as well as the measured electromagnetic shower lateral profile are presented.
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We report a two-detector measurement of the propagation speed of neutrinos over a baseline of 734 km. The measurement was made with the NuMI beam at Fermilab between the near and far MINOS detectors. The fractional difference between the neutrino speed and the speed of light is determined to be $(v/c-1) = (1.0 pm 1.1) times 10^{-6}$, consistent with relativistic neutrinos.
We present results on the reconstruction of electromagnetic (EM) activity from photons produced in charged current $ u_{mu}$ interactions with final state $pi^0$s. We employ a fully-automated reconstruction chain capable of identifying EM showers of $mathcal{O}$(100) MeV energy, relying on a combination of traditional reconstruction techniques together with novel machine-learning approaches. These studies demonstrate good energy resolution, and good agreement between data and simulation, relying on the reconstructed invariant $pi^0$ mass and other photon distributions for validation. The reconstruction techniques developed are applied to a selection of $ u_{mu} + {rm Ar} rightarrow mu + pi^0 + X$ candidate events to demonstrate the potential for calorimetric separation of photons from electrons and reconstruction of $pi^0$ kinematics.
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