Results
author = "Strakovsky, I. I."
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