2,953 research outputs found
Multichannel parametrization of \pi N scattering amplitudes and extraction of resonance parameters
We present results of a new multichannel partial-wave analysis for \pi N
scattering in the c.m. energy range 1080 to 2100 MeV. This work explicitly
includes \eta N and K \Lambda channels and the single pion photoproduction
channel. Resonance parameters were extracted by fitting partial-wave amplitudes
from all considered channels using a multichannel parametrization that is
consistent with S-matrix unitarity. The resonance parameters so obtained are
compared to predictions of quark models
Partial-wave analysis of {\pi}-p {\to} {\eta}n and {\pi}-p {\to} K0{\Lambda} reactions
We investigate the hadronic reactions {\pi}N {\to} {\eta}N and {\pi}N {\to}
K{\Lambda} via single-energy partial-wave analyses in the c.m. energy range
1080 to 2100 MeV. Our results for the K{\Lambda} channel are consistent with
prior works; however, for the {\eta}N channel our results differ significantly
from previous energy-dependent partial-wave analyses that violate the S-matrix
unitarity. We present the first (new) results of {\eta}N and K{\Lambda}
partial-wave amplitudes constrained by a unitary energy-dependent model. We
obtain excellent predictions of integrated cross sections for the two reactions
from a global energy-dependent solution. Our results imply that the region just
above S11 (1535) has a major contribution from P11 (1710) for {\pi}-p {\to}
{\eta}n, whereas the large peak near 1700 MeV in {\pi}-p {\to} K0{\Lambda} is
dominated by contributions from both S11 (1650) and P11 (1710).Comment: 20 pages, 5 figure
Model Dependence of the Properties of S11 Baryon Resonances
The properties of baryon resonances are extracted from a complicated process
of fitting sophisticated, empirical models to data. The reliability of this
process comes from the quality of data and the robustness of the models
employed. With the large of amount of data coming from recent experiments, this
is an excellent time for a study of the model dependence of this extraction
process. A test case is chosen where many theoretical details of the model are
required, the S11 partial wave. The properties of the two lowest N* resonances
in this partial wave are determined using various models of the resonant and
non-resonant amplitudes.Comment: 24 pages, 10 figures; revised fits with error estimates, expanded
comparison between CMB and K-matrix model
Effect of exotic S=+1 resonances on scattering data
We consider the effect of an exotic S=+1 resonance on the
scattering of neutral kaons off protons. Explicit results are presented for the
total cross sections.Comment: 2 pages, 3 figure
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