scholarly journals Helicity Beam Asymmetry I☉ in Two Neutral Pseudoscalar Photoproduction Reactions at the Crystal Barrel Experiment

2010 ◽  
Author(s):  
Andrew Wilson ◽  
Volker Crede ◽  
Paul Eugenio ◽  
A. Ostrovidov
Keyword(s):  
Beam Asymmetry ◽  
Photoproduction Reactions

scholarly journals Experimental study of the $ \gamma p \rightarrow K^{0}\Sigma^{+}$, $ \gamma n \rightarrow K^{0} \Lambda$, and $ \gamma n \rightarrow K^{0} \Sigma^{0}$ reactions at the Mainz Microtron

2019 ◽  
Vol 55 (11) ◽  
Author(s):  
C. S. Akondi ◽  
K. Bantawa ◽  
D. M. Manley ◽  
S. Abt ◽  
P. Achenbach ◽  
...  
Keyword(s):  
Experimental Study ◽  
Cross Sections ◽  
Differential Cross ◽  
Legendre Polynomials ◽  
Neutral Kaon ◽  
Experimental Results ◽  
Differential Cross Sections ◽  
Theoretical Predictions ◽  
Photoproduction Reactions ◽  
Insight Into

Abstract.This work measured $ \mathrm{d}\sigma/\mathrm{d}\Omega$dσ/dΩ for neutral kaon photoproduction reactions from threshold up to a c.m. energy of 1855MeV, focussing specifically on the $ \gamma p\rightarrow K^0\Sigma^+$γp→K0Σ+, $ \gamma n\rightarrow K^0\Lambda$γn→K0Λ, and $ \gamma n\rightarrow K^0 \Sigma^0$γn→K0Σ0 reactions. Our results for $ \gamma n\rightarrow K^0 \Sigma^0$γn→K0Σ0 are the first-ever measurements for that reaction. These data will provide insight into the properties of $ N^{\ast}$N* resonances and, in particular, will lead to an improved knowledge about those states that couple only weakly to the $ \pi N$πN channel. Integrated cross sections were extracted by fitting the differential cross sections for each reaction as a series of Legendre polynomials and our results are compared with prior experimental results and theoretical predictions.

scholarly journals Recent results from the CBELSA/TAPS experiment at ELSA

2020 ◽  
Vol 241 ◽  
pp. 01001
Author(s):  
Farah Afzal
Keyword(s):  
Final States ◽  
Excitation Spectra ◽  
Unpolarized Cross Section ◽  
Polarized Target ◽  
Double Polarization ◽  
Perturbative Regime ◽  
Measured Polarization ◽  
Polarization Observables ◽  
The Impact ◽  
Photoproduction Reactions

In order to gain a better understanding of the dynamics inside the nucleon and of the non-perturbative regime of QCD, the nucleon excitation spectra and the properties of nucleon resonances are investigated. An essential experimental tool to achieve this goal is the study of different photoproduction reactions. Partial wave analyses are performed in order to obtain information about the contributing resonances. A complete experiment is needed to extract the underlying amplitudes unambiguously, which requires the measurement of carefully chosen single and double polarization observables in addition to the unpolarized cross section. The CBELSA/TAPS experiment in Bonn offers the possibility to measure several polarization observables using a linearly or circularly polarized photon beam and with a longitudinally or transversely polarized target. This contribution gives an overview of recently measured polarization observables in different final states. The impact of the new data is discussed.

scholarly journals RESTRICTED LOCALITY OF QUARK-HADRON DUALITY IN EXCLUSIVE MESON PHOTOPRODUCTION REACTIONS ABOVE THE RESONANCE REGION

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1910-1913 ◽  
Author(s):  
QIANG ZHAO ◽  
FRANK E. CLOSE
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Scaling Laws ◽  
Resonance Region ◽  
Meson Photoproduction ◽  
Counting Rule ◽  
Dimensional Scaling ◽  
Exclusive Processes ◽  
Photoproduction Reactions ◽  
Hadron Duality

We show how deviations from the dimensional scaling laws for exclusive processes may be related to a breakdown in the locality of quark-hadron duality, i.e. the "restricted locality". For exclusive reactions like meson photo- and electroproduction above the resonance region, we explore the effects arising from such a local duality breaking and propose that it can be a possible source for oscillations about the smooth quark counting rule predicted by pQCD in the 90-degree differential cross sections.

scholarly journals Beam asymmetry Σ for the photoproduction of η and η′ mesons at Eγ=8.8GeV

2019 ◽  
Vol 100 (5) ◽  
Author(s):  
S. Adhikari ◽  
A. Ali ◽  
M. Amaryan ◽  
A. Austregesilo ◽  
F. Barbosa ◽  
...  
Keyword(s):  
Beam Asymmetry

scholarly journals Measurement of the photon beam asymmetry in γ⃗p→K+Σ0 at Eγ=8.5 GeV

2020 ◽  
Vol 101 (6) ◽  
Author(s):  
S. Adhikari ◽  
A. Ali ◽  
M. Amaryan ◽  
A. Austregesilo ◽  
F. Barbosa ◽  
...  
Keyword(s):  
Photon Beam ◽  
Beam Asymmetry

A measurement of the beam asymmetry parameter Σ for neutral pion photoproduction in the energy range 1.2–2.8 GeV

1976 ◽  
Vol 104 (2) ◽  
pp. 253-276 ◽  
Author(s):  
P.J. Bussey ◽  
C. Raine ◽  
J.G. Rutherglen ◽  
P.S.L. Booth ◽  
L.J. Carroll ◽  
...  
Keyword(s):  
Energy Range ◽  
Asymmetry Parameter ◽  
Neutral Pion ◽  
Pion Photoproduction ◽  
Beam Asymmetry
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