"Precision Measurement of the Proton Electric to Magnetic Form Factor Ratio with BLAST"

We are undertaking a measurement of the G_E^p/G_M^p ratio to a Q² value of 0.9 (GeV/c)² using elastic p(e,e'p) scattering in the South Hall Ring of the Bates Linear Accelerator Facility. This experiment uses a highly polarized electron beam, an internal polarized atomic hydrogen gas target with negligible dilution, and the symmetric Bates Large Acceptance Spectrometer Toriod (BLAST). We take simultaneous measurements of two spin-dependent asymmetries corresponding to the same value of Q² in the left and right sectors of the symmetric BLAST detector, effectively reducing systematic errors. The proton electric and magnetic form factor ratio, extracted from the super-ratio of these two asymmetries, is independent of beam and target polarizations. Preliminary asymmetry results will be presented.

"p+pbar→Λ+Λbar with a Polarized Target"

The reaction p+pbar→Λ+Λbar was examined by CERN experiment PS185/3 at the Low-Energy Antiproton Ring (LEAR) with beam momenta of 1.525 GeV/c and 1.640 GeV/c. The proton target was transversely polarized to enable measurements of the depolarization and spin transfer, which quantify the transfer of the transverse spin of the target proton to that of the outgoing Λ and Λbar, respectively. Theoretical calculations of Dnn, the component of the depolarization normal to the production plane, differ greatly according to whether quark-gluon or meson-exchange models are utilized. Final results for the measured depolarization Dnn and spin transfer Knn will be presented for both beam momenta. These results appear to be inconsistent with the specific angular distributions predicted under the assumptions of both production scenarios.

"The G0 Experiment"

The G0 experiment in Hall C at Jefferson Lab measures the parity-violating asymmetry in elastic electron scattering on hydrogen and quasielastic electron scattering on deuterium, in the Q² range from 0.1 to 1 (GeV/c)² in forward and backward running modes by using a longitudinally polarized electron beam on unpoloarized liquid targets. The goal of the experiment is to map the electric and magnetic strange from factors of the nucleon in this Q² range. The installation of the G0 experiment in Hall C was completed by the end of October, 2002. The first engineering run for the forward running mode acquired data between Oct, 2002 and Jan, 2003, and I will present the status of the G0 experiment after this run.

"A Nuclear Physics Axion Search for Solution of the Strong CP Problem"

Solution of the Strong CP problem requires a light paeudoscalar meson - the axion - or a massless quark. An axion with mass around 9 MeV can compete with M1 nuclear transitions, but would have a very different angular distribution. AK will tell us about his thesis experiment at Stonybrook involving a search for the axion.

"An Improved Limit on the Muon Electric Dipole Moment"

The muon g-2 Experiment at Brookhaven National Lab was designed to measure the anomalous magnetic moment of the muon. A seperate analysis has been performed to measure the muon electric dipole moment (EDM) at the 10^-19 e·cm level. An EDM in an elementary partricle would violate parity and time reversal symmetry. This talk will discuss the methods used to measure the EDM and overcome systematic error issues.

"Modular Matrix Models and Moonshine"

Inspired by the formal resemblance between certain Laurent expansions of modular functions and the master field formalism for matrix models, I construct a Hermitian one-matrix model. Together with an N=1 gauge theory and a special Calabi-Yau geometry, this matrix model encodes the elliptic j-invariant, and hence, by Moonshine, the irreducible representations of the Monster sporadic group.

"Weak Pion-Nucleon Coupling and Parity Violation in the Radiative Capture of Polarized Cold Neutrons on Hydrogen"

The NPDGamma collaboration has constructed an apparatus to determine the size of the pion-nucleon coupling constant in the parity non conserving pion exchange weak potential for N-N interactions. This coupling constant is directly proportional to the parity violating up-down asymmetry in the angular distribution of gamma rays with respect to the neutron spin direction in the reaction n + p → d + γ. The asymmetry has a predicted size of 5 × 10^-8 and we will measure it to 10%. In this talk, I will give an outline of the theoretical background, present the motivation for the experiment and report on experimental setup as well as the current status of the project. Emphasis will be placed on the performance results for the CsI detector array, DAQ and analysis, the spin flipper and the possible systematic effects for this setup.

Dr. Boris Kayser (Fermilab)

"The Neutrino World: Present and Future"

Neutrinos are among the most abundant particles in the universe. In the past few years, we have found compelling evidence that they can morph from one "flavor" to another. This flavor change implies that neutrinos have nonzero masses, and opens a whole new world for us to explore. In this talk, we will explain what has been learned about the neutrinos so far, identify some of the major open questions, and discuss future experiments that can help us to answer them.

Dr. Wolfgang Menges (DESY)

"Measurement of Charged Triple Gauge Coupling Parameters at e⁺e^- Colliders"

The study of charged triple gauge boson couplings (TGCs) represents a crucial test of the gauge structure of the electroweak sector of the standard model. I present the measurement of TGCs in the reaction e⁺e^-→W⁺W^-→qqqq using the full LEP2 data set recorded by the OPAL detector at CERN. These results are combined with the results from the other two W-pair final states measured at OPAL and with the measurements of the other three LEP experiments. At the end I will briefly discuss the potential of such a measurement at a high luminocity linear collider like TESLA including the benefits from using longitudinal polarized beams.

Dr. Bruce Yabsley (Virginia Tech)

"Charm studies, unexpected results, and exotic particles at Belle"

The Belle experiment is dedicated to the study of CP-violation in the B-meson system, but we also have an active programme of charm studies, charmonium searches, and other physics analyses. These studies have produced some of our most interesting results. In this talk I will review an exotic meson candidate, and measurements which deviate from theoretical models by a factor of 10, as well as more conventional physics results. I'll conclude with a discussion of pentaquark searches.