BONN-GATCHINA ANALYSIS: DEVELOPMENT OF THE METHOD AND ANALYSIS OF NEW PHOTO-PRODUCTION DATA

The new method for a combined analysis of meson production data is presented. This method fully satisfies the unitarity and analyticity conditions and is suitable for an analysis of modern high statistic data. The results obtained in the framework of this approach are compared with the results of the K-matrix analysis. Including in the analysis of the meson production reaction the data from the γ-neutron collision allows us to extract the information about the helicity couplings [Formula: see text] and [Formula: see text] of nucleon states.

TWO PHOTON PHYSICS AT BELLE

Results of high statistic two-photon collisions at Belle are presented. Only [Formula: see text] process is included in this report, here [Formula: see text] could be π+π-, K+K-, [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] or [Formula: see text]. Measurements of [Formula: see text] for charmonia resonance states are listed. A new χ′c2 candidate in [Formula: see text] has been identified as a spin-2 (helicity-2) object. Cross section and production angle distributions are measured and compared with various QCD calculations.

Limits on the Neutrino Magnetic Moment Using Super-Kamiokande Solar Neutrino Data

Existence of non-zero neutrino magnetic moment would mean new physics beyond the standard model. A search for the neutrino magnetic moment has been conducted using the high statistic solar neutrino data from Super-Kamiokande-I. This is done by looking for the distortion to the observed energy spectrum of recoil electrons. A non-zero neutrino magnetic moment would cause an increase of event rates at lower energies. The search found no clear signal of neutrino magnetic moment. A limit on the neutrino magnetic moment has been obtained at 3.6 × 10-10μB at 90% C.L. by fitting to the Super-Kamiokande day-night spectra. The effects of neutrino oscillation have been included in the analysis. Including results from other neutrino experiments limiting the oscillation region, a limit of 1.1 × 10-10μB at 90% C.L. was obtained.

Observation of the Crab Pulsar With Bepposax: Phase Resolved Spectroscopy and Study of the Pulsar Profile.

The Crab Pulsar(PSR 0531+21) was observed by the four Narrow Field Instruments on board the Italian-Dutch satellite BeppoSAX on August and September 1996, during the Science Verificado Phase. The fine time resolution (15 μs) and the high statistic of the data provided phase histogram of very good quality, well suited for phase resolved spettroscopy over the entire energy band (0.1-300 keV) covered by BeppoSAX payload. In this contribution we present preliminary results of the spectra distribution of the peaks and the inter peak region. Moreover, we also carried out a detailed analysis of the P1 shape and the behaviour of the P2/P1 ratio with the energy.