John P. Ralston

RICE limits on the diffuse ultrahigh energy neutrino flux

We present new limits on ultrahigh energy neutrino fluxes above

Femtophotography of protons to nuclei with deeply virtual Compton scattering

{10}^{17}\text{ }\text{ }\mathrm{eV}

Indication of Anisotropy in Electromagnetic Propagation over Cosmological Distances

based on data collected by the Radio Ice Cherenkov Experiment (RICE) at the South Pole from 1999\char21{}2005. We discuss estimation of backgrounds, calibration and data analysis algorithms (both online and offline), procedures used for the dedicated neutrino search, and refinements in our Monte Carlo (MC) simulation, including recent in situ measurements of the complex ice dielectric constant. An enlarged data set and a more detailed study of hadronic showers results in a sensitivity improvement of more than 1 order of magnitude compared to our previously published results. Examination of the full RICE data set yields zero acceptable neutrino candidates, resulting in 95% confidence-level model-dependent limits on the flux

Testing the handbag contribution to exclusive virtual Compton scattering

{E}_{\ensuremath{\nu}}^{2}d\ensuremath{\phi}/d{E}_{\ensuremath{\nu}}l{10}^{\ensuremath{-}6}\text{ }\text{ }\mathrm{GeV}/(\mathrm{c}{\mathrm{m}}^{2}\text{ }\mathrm{s}\text{ }\mathrm{sr})

Multidimensional Methods for the Formulation of Biopharmaceuticals and Vaccines

in the energy range

Limits on the Ultra-High Energy Electron Neutrino Flux from the RICE Experiment

{10}^{17}l{E}_{\ensuremath{\nu}}l{10}^{20}\text{ }\text{ }\mathrm{eV}

Quantum color transparency and nuclear filtering

. The new RICE results rule out the most intense flux model projections at 95% confidence level.

Extra dimensions and strong neutrino-nucleon interactions above 1019 eV: breaking the GZK barrier

Developments in deeply virtual Compton scattering allow the direct measurements of scattering amplitudes for exchange of a highly virtual photon with fine spatial resolution. Real-space images of the target can be obtained from this information. Spatial resolution is determined by the momentum transfer rather than the wavelength of the detected photon. Quantum photographs of the proton, nuclei, and other elementary particles with resolution on the scale of a fraction of a femtometer is feasible with existing experimental technology.

Anisotropy in the propagation of radio polarizations from cosmologically distant galaxies

We report a systematic rotation of the plane of polarization of electromagnetic radiation propagating over cosmological distances. The effect is extracted independently from Faraday rotation, and found to be correlated with the angular positions and distances to the sources. Monte Carlo analysis yields probabilistic P values of order 10{sup -3} for this to occur as a fluctuation. A fit yields a birefringence scale of order 10{sup 25}(h{sub 0})/(h)m. Dependence on redshift z rules out a local effect. Barring hidden systematic bias in the data, the correlation indicates a new cosmological effect. {copyright} {ital 1997} {ital The American Physical Society}

Testing Isotropy of Cosmic Microwave Background Radiation

Abstract We discuss the handbag approximation to exclusive deep virtual Compton scattering. After defining the kinematical region where this approximation can be valid, we propose tests for its relevance in planned electroproduction experiments, e + p → e + p + γ . We focus on scaling laws in the cross section, and the distribution in the angle between the lepton and hadron planes, which contains valuable information on the angular momentum structure of the Compton process. We advocate to measure weighted cross sections, which make use of the data in the full range of this angle and do not require very high event statistics.