2,603 research outputs found
Correlations of Partial Waves for Multi-Reaction Analyses
In the search for missing baryonic resonances, many analyses include data
from a variety of pion- and photon-induced reactions. For elastic
scattering, however, usually the partial waves of the SAID or other groups are
fitted, instead of data. We provide the partial-wave covariance matrices needed
to perform correlated fits, in which the obtained equals the
actual up non-linear and normalization corrections. For any analysis
relying on partial waves extracted from elastic pion scattering, this is a
prerequisite to assess the significance of resonance signals and to assign any
uncertainty on results. The influence of systematic errors is also considered.Comment: 7 pages, 3 figures; Acknowledgements update
Partial-Wave Analysis of Single-Pion Production Reactions
We present an overview of our efforts to analyze pion-nucleon elastic
scattering data, along with data from related photo- and electroproduction
reactions, in order to study the baryon spectrum. We then focus on the
Delta(1232) resonance. Fits to pion photo- and electroproduction data have been
used to extract values for the R_EM = E2/M1 and R_SM = S2/M1 ratios as
functions of Q^2. These results are compared to other recent determinations.Comment: 7 pages, 9 figures, the Shape of Hadrons Workshop Proceedings (27-29
April, 2006 Athens, Greece
Results from the Analysis of Crystal Ball Meson Production Measurements at BNL
The Crystal Ball spectrometer, with its nearly complete angular coverage, is
an efficient detector of photon and neutron final states. While installed in
the C6 beamline of the Alternating Gradient Synchrotron (AGS) of Brookhaven
National Laboratory (BNL), this feature was used in a series of precise
measurements of reactions with all-neutral final states. Here we concentrate on
the analysis of data from the pion-induced reactions: pi- p --> gamma n, pi- p
--> pi0 n, pi- p --> eta n, and pi- p --> pi0 pi0 n.Comment: Conference contribution to MESON 2006 - Krakow, Pola
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
Unified Chew-Mandelstam SAID analysis of pion photoproduction data
A unified description of single-pion photoproduction data, together with
pion- and eta-hadroproduction data, has been achieved in a Chew-Mandelstam
parametrization which is consistent with unitarity at the two-body level.
Energy-dependent and single-energy partial wave analyses of pion
photoproduction data have been performed and compared to previous SAID fits and
multipoles from the Mainz and Bonn-Gatchina groups.Comment: 11 pages, 9 figures, and 2 table
Toward a unified description of hadro- and photoproduction amplitudes
The near-term objectives of the research program at the Data Analysis Center
are established within the context of the existing partial wave analyses
available through the online suite of analysis and database codes accessible
through SAID, the Scattering Analysis Interactive Database. This presentation
reviews the efforts to determine a model independent method to obtain sets of
partial wave amplitudes for strong and electromagnetic reactions, the
interpretation of the amplitudes in terms of the excited states of the nucleon,
the role of new precision unpolarized and polarized data, and new developments
aimed at determining the photoproduction mulitpoles in a unitary,
coupled-channel approach. The Chew-Mandelstam technique is discussed and
applied to the problem of the S-wave pion- and eta-photoproduction amplitudes.
The resulting eta production amplitudes exhibit the expected resonant behavior
near the eta production threshold. Application of this method to a unified
description of the hadro- and photoproduction amplitudes is discussed.Comment: 4 pages, 1 figure, invited talk for the 12th International Conference
on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2010),
Williamsburg, Virginia, 31 May - 4 Jun 201
Effect of Sigma-beam Asymmetry Data on Fits to Single Pion Photoproduction off Neutron
We investigate the influence of new GRAAL Sigma-beam asymmetry measurements
on the neutron 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 the sum rule.Comment: 4 pages, 4 figures, 1 table; v2/v3: minor corrections; Presented at
the 8th Workshop on the Physics of Excited Nucleons (NSTAR2011), Newport
News, USA, May 201
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