18 research outputs found
Photoproduction of eta mesons from the neutron: cross sections and double polarization observable E
Photoproduction of mesons from neutrons} \abstract{Results from
measurements of the photoproduction of mesons from quasifree protons and
neutrons are summarized. The experiments were performed with the CBELSA/TAPS
detector at the electron accelerator ELSA in Bonn using the
decay. A liquid deuterium target was used for the
measurement of total cross sections and angular distributions. The results
confirm earlier measurements from Bonn and the MAMI facility in Mainz about the
existence of a narrow structure in the excitation function of . The current angular distributions show a forward-backward
asymmetry, which was previously not seen, but was predicted by model
calculations including an additional narrow state. Furthermore, data
obtained with a longitudinally polarized, deuterated butanol target and a
circularly polarized photon beam were analyzed to determine the double
polarization observable . Both data sets together were also used to extract
the helicity dependent cross sections and . The
narrow structure in the excitation function of
appears associated with the helicity-1/2 component of the reaction
The polarization observables T, P, and H and their impact on multipoles
Data on the polarization observables T, P, and H for the reaction are reported. Compared to earlier data from other experiments, our
data are more precise and extend the covered range in energy and angle
substantially. The results were extracted from azimuthal asymmetries measured
using a transversely polarized target and linearly polarized photons. The data
were taken at the Bonn electron stretcher accelerator ELSA with the CBELSA/TAPS
detector. Within the Bonn-Gatchina partial wave analysis, the new polarization
data lead to a significant narrowing of the error band for the multipoles for
neutral-pion photoproduction
First measurement of the helicity asymmetry for in the resonance region
The first measurement of the helicity dependence of the photoproduction cross
section of single neutral pions off protons is reported for photon energies
from 600 to 2300\,MeV, covering nearly the full solid angle. The data are
compared to predictions from the SAID, MAID, and BnGa partial wave analyses.
Strikingly large differences between data and predictions are observed which
are traced to differences in the helicity amplitudes of well known and
established resonances. Precise values for the helicity amplitudes of several
resonances are reported
The N(1520) 3/2- helicity amplitudes from an energy-independent multipole analysis based on new polarization data on photoproduction of neutral pions
New data on the polarization observables T, P, and H for the reaction are reported. The results are extracted from azimuthal
asymmetries when a transversely polarized butanol target and a linearly
polarized photon beam are used. The data were taken at the Bonn electron
stretcher accelerator ELSA using the CBELSA/TAPS detector. These and earlier
data are used to perform a truncated energy-independent partial wave analysis
in sliced-energy bins. This energy-independent analysis is compared to the
results from energy-dependent partial wave analyses
Well-established nucleon resonances revisited by double-polarization measurements
The first measurement is reported of the double-polarization observable G in
photoproduction of neutral pions off protons, covering the photon energy range
from 620 to 1120 MeV and the full solid angle. G describes the correlation
between the photon polarization plane and the scattering plane for protons
polarized along the direction of the incoming photon. The observable is highly
sensitive to contributions from baryon resonances. The new results are compared
to the predictions from SAID, MAID, and BnGa partial wave analyses. In spite of
the long-lasting efforts to understand {\gamma}p -> p{\pi} 0 as the simplest
photoproduction reaction, surprisingly large differences between the new data
and the latest predictions are observed which are traced to different
contributions of the N (1535) with spin-parity J^P = 1/2^- and N (1520) with
J^P = 3/2^- . In the third resonance region, where N (1680) with J^P = 5/2^+
production dominates, the new data are reasonably close to the predictions.Comment: Submitted for publication in PR
New data on with polarized photons and protons and their implications for decays
The polarization observables , and in photoproduction of
mesons off protons are measured for photon energies from threshold to
MeV (), 2280 MeV (), 1620 MeV (), or 1820 MeV (),
covering nearly the full solid angle. The data are compared to predictions from
the SAID, MAID, J\"uBo, and BnGa partial-wave analyses. A refit within the BnGa
approach including further data yields precise branching ratios for the
decay of nucleon resonances. A -branching ratio of for
is found, which reduces the large and controversially discussed
-branching ratio difference of the two lowest mass
-resonances significantly.Comment: 10 pages, 11 figure
Measurement of the helicity asymmetry
A measurement of the double-polarization observable E for the reaction is reported. The data were taken with the CBELSA/TAPS experiment at the ELSA facility in Bonn using the Bonn frozen-spin butanol (CHOH) target, which provided longitudinally-polarized protons. Circularly-polarized photons were produced via bremsstrahlung of longitudinally-polarized electrons. The data cover the photon energy range from to 2310Â MeV and nearly the complete angular range. The results are compared to and have been included in recent partial wave analyses
Polarization observables in double neutral pion photoproduction
Measurements of target asymmetries and double-polarization observables for
the reaction are reported. The data were taken with
the CBELSA/TAPS experiment at the ELSA facility (Bonn University) using the
Bonn frozen-spin butanol (CHOH) target, which provided transversely
polarized protons. Linearly polarized photons were produced via bremsstrahlung
off a diamond crystal. The data cover the photon energy range from
=650 MeV to =2600 MeV and nearly the complete angular
range. The results have been included in the BnGa partial wave analysis.
Experimental results and the fit agree very well. Observed systematic
differences in the branching ratios for decays of and
resonances are attributed to the internal structure of these excited nucleon
states. Resonances which can be assigned to SU(6)O(3) two-oscillator
configurations show larger branching ratios to intermediate states with
non-zero intrinsic orbital angular momenta than resonances assigned to
one-oscillator configurations.Comment: 21 pages, 27 figure