author = "Strakovsky, I. I."

Found 82 documents, displaying page 1 of 9

## Resonances, and mechanisms of Theta-production

Description : After explaining necessity of exotic hadrons, we discuss mechanisms which could determine production of the exotic Theta-baryon. A possible important role of resonances (producing the Theta in real or virtual decays) is emphasized for various processes. Several experimental directions for studies ...
Repository : arXiv
Language(s) : Undetermined

## Nucleon Helicity in Pion Photoproduction

Description : Pion-photoproduction data is examined to check for the nucleon-helicity conservation predicted by asymptotic QCD. The differential cross section shows agreement with constituent-counting rules, and polarization data is not in disagreement with conservation of nucleon helicity. However large uncert...
Repository : arXiv
Language(s) : Undetermined

## Nucleon and Hyperon Resonances with the Crystal Ball

Description : The Crystal Ball Spectrometer is being used at Brookhaven National Laboratory in a series of experiments which study all neutral final states of pi-p and K-p induced reactions. We report about the experimental setup and progress in obtaining new results for the radiative capture reactions pi-p-->g...
Repository : arXiv
Language(s) : Undetermined

## Analysis of Pion Electroproduction Data

Description : A fit to the existing pion electroproduction data is presented. This work builds upon our previous analyses of pion photoproduction and elastic pion-nucleon scattering over the Delta resonance region. We comment on the extraction of E_1+ ^3/2 / M_1+ ^3/2 (E2/M1) and S_1+ ^3/2 / M_1+ ^3/2 (S2/M1) r...
Repository : arXiv
Language(s) : Undetermined

## Effect of double-polarization data in fits to single-pion photoproduction

Description : We investigate the influence of new Jefferson Lab polarization-transfer data, Cx and Cz, and recoil polarization, Py, measurements in multipole fits to the single-pion photoproduction database. Results are compared to those found with the addition of a double-polarization quantity associated with ...
Repository : arXiv
Language(s) : Undetermined

## K+ nucleon scattering and exotic S=+1 Baryons

Description : The K+ nucleon elastic scattering process has been reexamined in light of recent measurements which have found a narrow exotic S=+1 resonance in their KN invariant mass distributions. We have analyzed the existing database in order to consider the effect of a narrow state on fits to K+ nucleon obs...
Repository : arXiv
Language(s) : Undetermined

## K+N scattering data and exotic Z+ resonances

Description : Given the growing evidence for an exotic S = +1 resonance, seen in kaon, photon and neutrino induced reactions, we reexamine the existing K+p and K+d database in order to understand how such a state could have been missed in previous studies. The lack of structure in this database implies a width ...
Repository : arXiv
Language(s) : Undetermined

## Extraction of the $\pi NN$ coupling constant from NN scattering data

Description : We reexamine Chew's method for extracting the $\pi NN$ coupling constant from np differential cross section measurements. Values for this coupling are extracted below 350 MeV, in the potential model region, and up to 1 GeV. The analyses to 1~GeV have utilized 55 data sets. We compare these results...
Repository : arXiv
Language(s) : Undetermined

## Updated resonance photo-decay amplitudes to 2 GeV

Description : We present the results of an energy-dependent and set of single-energy partial-wave analyses of single-pion photoproduction data. These analyses extend from threshold to 2 GeV in the laboratory photon energy, and update our previous analyses to 1.8 GeV. Photo-decay amplitudes are extracted for the...
Repository : arXiv
Language(s) : Undetermined

## Comment on `Measurement of the $\pi^+ \vec p$ analyzing power at 68.3 MeV'

Description : We comment on a recent paper by Weiser et al. [Phys. Rev. C {\bf 54}, 1930 (1996)]. The authors have performed a single-energy analysis of $\pi^+ p$ scattering data at 68.3 MeV, finding a value for the $S_{31}$ phase shift about 1^o smaller than found in the Karlsruhe-Helsinki (KH) partial-wave an...
Repository : arXiv
Language(s) : Undetermined

Found 82 documents, displaying page 1 of 9