Douglas W. McKay

RICE limits on the diffuse ultrahigh energy neutrino flux

We present new limits on ultrahigh energy neutrino fluxes above

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

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

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

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

On radio detection of ultrahigh energy neutrinos in Antarctic ice

{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})

Performance and simulation of the RICE detector

in the energy range

Analytic derivation of the leading-order gluon distribution function G ( x , Q 2 ) = x g ( x , Q 2 ) from the proton structure function F 2 p ( x , Q 2 )

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

Small-x QCD and the ultra-high energy νN total cross section

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

Sensitivity of medium-baseline reactor neutrino mass-hierarchy experiments to nonstandard interactions

Abstract Upper limits are presented on the diffuse flux of ultra-high energy νe, based on analysis of data taken by the RICE experiment during August, 2000. The RICE receiver array at South Pole monitors cold ice for radio-wavelength Cherenkov radiation resulting from neutrino induced in-ice showers. For energies above 1 EeV, RICE is an effective detector of over 15 km3 sr. Potential signal events are separated from backgrounds using vertex location, event reconstruction, and signal shape. These are the first terrestrial limits exploiting the physics of radio-Cherenkov emissions from charged current νe+N→e+N′ interactions.

Angular correlation of ultra-high energy cosmic rays with compact radio-loud quasars

Abstract Cosmic ray events above 1020 eV are on the verge of confronting fundamental particle physics. The neutrino is the only candidate primary among established particles capable of crossing 100 Mpc intergalactic distances unimpeded. The magnitude of νN cross sections indicated by events, plus consistency with the Standard Model at low-energy, point to new physics of massive spin-2 exchange. In models based on extra dimensions, we find that the νN cross section rises to typical hadronic values of between 1 and 100 mb at energies above 1020 eV. Our calculations take into account constraints of unitarity. We conclude that air-showers observed with energies above 1019 eV are consistent with neutrino primaries and extra-dimension models. An upper bound of 1–10 TeV on the mass scale at which graviton exchange becomes strong in current Kaluza–Klein models follows.

Signatures of pseudoscalar photon mixing in CMB polarization

Interactions of ultrahigh energy neutrinos of cosmological origin in large volumes of dense, radio-transparent media can be detected via coherent Cherenkov emission from accompanying electromagnetic showers. Antarctic ice meets the requirements for an efficient detection medium for a radio frequency neutrino telescope. We carefully estimate the sensitivity of realistic antennas embedded deep in the ice to 100 MHz - 1 GHz signals generated by predicted neutrino fluxes from active galactic nuclei. Our main conclusion is that a {\it single radio receiver} can probe a