783639
Continuous spin representations of the Poincaré and super-Poincaré groups
We construct Wigner’s continuous spin representations of the Poincare algebra for massless particles in higher dimensions. The states are labeled both by the length of a spacelike translation vector and the Dynkin indices of the short little group SO(d−3), where d is the space–time dimension. Continuous spin representations are in one-to-one correspondence with representations of the short little group. We also demonstrate how combinations of the bosonic and fermionic representations form supermultiplets of the super-Poincare algebra. If the light-cone translations are nilpotent, these representations become finite dimensional, but contain zero or negative norm states, and their supersymmetry algebra contains a central charge in four and ten dimensions.
118188329
The continuous spin representations of the Poincare and super-Poincare groups and their construction by the Inonu-Wigner group contraction
119112759
Sensitivity of medium-baseline reactor neutrino mass-hierarchy experiments to nonstandard interactions
We explore the impact of nonstandard interactions at source and detector on the interpretation of reactor electron neutrino disappearance experiments with short- and medium-baseline designs. We use the constraints from the recent results from short-baseline experiments and generalize current estimates of medium-baseline event rates to include charged current interactions at source and detector with standard Lorentz structure but with nonstandard flavor structure. We find that the average spectrum of observed events at a baseline of 50 km, in the middle of the currently favored region, provides a probe of new interactions. We show that an improvement in sensitivity to nonstandard interactions is possible if combined with improved precision of input mixing parameters in independent experiments, despite ambiguity in interpretation of medium-baseline data. We show that nonstandard interactions can enhance or suppress the sensitivity of experiments to the mass hierarchy, depending on the phases of the parameters and the CP-violating phase in the standard three-neutrino mixing picture.
108772618
The Next Generation Scintillator-based Electromagnetic Calorimeter Prototype and Beam Test
Abstract We are studying next generation scintillation detectors for future collider experiments. For precise energy measurement of energetic jets in future experiments, particle flow algorithm with fine granular scintillator strip calorimeter will play an important role. To establish the technology of the calorimeter, we are studying the properties of small plastic scintillator strips with size of (10-5) x 50 x 3 mm, which is a fundamental component of the calorimeter. As a part of this R&D study, small extruded plastic Scintillator of size 10 x 45 x 3 mm and a tungsten plate with 3.5 mm thick are sampled together to Fabricate a Scintillator base electromagnetic calorimeter prototype. Prototype has a stack of 30 layers, having dimension of 20 x 20 cm. Fine Scintillator strips in successive layers aligned in orthogonal to achieve effective 1 x 1 cm segmentation. The total number of channels is 2160 for readout. scintillation light produced in plastic Scintillator strips enters the wavelength shifting (WLS) fiber placed inside the plastic Scintillator are guided to the sensitive photo detector 1600 pixel MPPC (Multi Pixel Photon Counter) with a sensitive region of 1 x 1 mm2. The electromagnetic calorimeter performance has been studied with test beam during summer 2008 and 2009 at Fermilab. We have injected 1-30 GeV electron and 60 GeV Pion beams and measured energy resolution and linearity of response toward input energy. In this presentation we will present obtained performance of the calorimeter prototype.