Accelerator and Reactor Neutrino Experiments

Present results from neutrino experiments at accelerators and nuclear reactors are reviewed with emphasis on neutrino oscillation searches. Future prospects in this field are also discussed.Comment: Review presented at LP9

Liberating community education and social change : the Regina Native women's group (1971-1986)

This thesis examines and interprets a social movement organization, the Regina Native Women's Group, as an organization that uses liberating community education as a method of improving the social, economic, cultural and political conditions of Native women and their families in the city of Regina. The study focuses on the issues of the housing and community-living crises that developed in Regina during the 1970's to portray the Group's utilization of liberating community education. The study examines factors such as racial and gender oppression, co-option by the state and dilemmas within the Regina Native Women's Group that often hindered it from obtaining social change. As well, the support that the organization received from grassroots organizations and society's institutions that enabled change to occur is also examined

Hard scattering and jets--from p-p collisions in the 1970's to Au+Au collisions at RHIC

Hard scattering in p-p collisions, discovered at the CERN ISR in 1972 by the method of leading particles, proved that the partons of Deeply Inelastic Scattering strongly interacted with each other. Further ISR measurements utilizing inclusive single or pairs of hadrons established that high pT particles are produced from states with two roughly back-to-back jets which are the result of scattering of constituents of the nucleons as described by Quantum Chromodynamics (QCD), which was developed during the course of these measurements. These techniques, which are the only practical method to study hard-scattering and jet phenomena in Au+Au central collisions, are reviewed, with application to measurements at RHIC.Comment: 4 pages, 5 figures, Proceedings of Hard Probes 2004, International Conference on Hard and Electromagnetic Probes of High Energy Nuclear Collisions, Nov 4-10, 2004, to appear in EPJ

From Bjorken Scaling to pQCD--Experimental techniques from p-p collisions of the 1970's with application to Au+Au collisions at RHIC

Hard scattering in p-p collisions was discovered at the CERN ISR in 1972, by the method of leading particles, which proved that the partons of Deeply Inelastic Scattering strongly interacted with each other. Further ISR measurements utilizing inclusive single or pairs of hadrons established that high pT particles are produced from states with two roughly back-to-back jets which are the result of scattering of constituents of the nucleons as described by Quantum Chromodynamics. These techniques, which are the only practical method to study hard-scattering and jet phenomena in Au+Au collisions at RHIC, will be reviewed.Comment: 10 pages, 6 figures, Proceedings of the 18th International Nuclear Physics Divisional Conference of the European Physical Society (NPDC18) Prague, Czech Republic, August 22-28, 2004, to appear in NP

Quiet Sun X-rays as Signature for New Particles

We have studied published data from the Yohkoh solar X-ray mission, with the purpose of searching for signals from radiative decays of new, as yet undiscovered massive neutral particles. This search is based on the prediction that solar axions of the Kaluza-Klein type should result in the emission of X-rays from the Sun direction beyond the limb with a characteristic radial distribution. These X-rays should be observed more easily during periods of quiet Sun. An additional signature is the observed emission of hard X-rays by SMM, NEAR and RHESSI. The recent observation made by RHESSI of a continuous emission from the non-flaring Sun of X-rays in the 3 to ~15 keV range fits the generic axion scenario. This work also suggests new analyses of existing data, in order to exclude instrumental effects; it provides the rationale for targeted observations with present and upcoming (solar) X-ray telescopes, which can provide the final answer on the nature of the signals considered here. Such measurements become more promising during the forthcoming solar cycle minimum with an increased number of quiet Sun periods.Comment: 14 pages, 3 figures; to be published in ApJ. May 20 200

Implications of Improved Upper Bounds on ∣ΔL∣=2|\Delta L|=2 Processes

We discuss implications of improved upper bounds on the $|\Delta L|=2$ processes (i) $K^+ \to \pi^- \mu^+ \mu^+$, from an experiment at BNL, and (ii) $\mu^- \to e^+$ conversion, from an experiment at PSI. In particular, we address the issue of constraints on neutrino masses and mixing, and on supersymmetric models with R-parity violation.Comment: 8 pages, Latex; published version with figs. added (Phys. Lett. B, in press

Is CP Violation Observable in Long Baseline Neutrino Oscillation Experiments ?

We have studied CP violation originated by the phase of the neutrino mixing matrix in the long baseline neutrino oscillation experiments. The direct measurements of CP violation is the difference of the transition probabilities between CP-conjugate channels. In those experiments, the CP violating effect is not suppressed if the highest neutrino mass scale is taken to be 1\sim 5 \eV, which is appropriate for the cosmological hot dark matter. Assuming the hierarchy for the neutrino masses, the upper bounds of CP violation have been caluculated for three cases, in which mixings are constrained by the recent short baseline ones. The calculated upper bounds are larger than $10^{-2}$, which will be observable in the long baseline accelerator experiments. The matter effect, which is not CP invariant, has been also estimated in those experiments.Comment: 28 pages, LaTex file, 6 figures included using epsfig Matter effect is estimated(Figs.3(a) (b)). Physical parameters are change

Probing possible decoherence effects in atmospheric neutrino oscillations

It is shown that the results of the Super-Kamiokande atmospheric neutrino experiment, interpreted in terms of nu_munu_tau flavor transitions, can probe possible decoherence effects induced by new physics (e.g., by quantum gravity) with high sensitivity, supplementing current laboratory tests based on kaon oscillations and on neutron interferometry. By varying the (unknown) energy dependence of such effects, one can either obtain strong limits on their amplitude, or use them to find an unconventional solution to the atmospheric nu anomaly based solely on decoherence.Comment: Title changed; major changes in the text; includes the discussion of a new solution to the atmosheric neutrino anomaly, based on decoherence; a second figure and a note have been adde

Neutrino Masses and Mixings in a Universal Seesaw Mass Matrix Model

Neutrino masses and mixings are investigated on the basis of a universal seesaw mass matrix model, in which quark (except for top) and charged lepton mass matrices M_f and neutrino mass matrix M_\nu are given by M_f \simeq m_L M_F^{-1} m_R and M_\nu \simeq m_L M_F^{-1} m_L^T (F=N), respectively. For a simple model which can successfully describe quark masses and mixings, we find that the observed neutrino data (except for the solar neutrino data) are favor to the intermediate mass scales O(m_R) = 10^{11} GeV and O(M_F)= 10^{13} GeV together with O(m_L)= 10^2 GeV. In spite of the largesse of O(m_R), the observed top quark mass can be consistently understood from the would-be seesaw mass matrix with these mass scales.Comment: 19 pages (Latex file