scholarly journals Helicity-dependent cross sections and double-polarization observable E in η photoproduction from quasifree protons and neutrons

2017 ◽  
Vol 95 (5) ◽  
Author(s):  
L. Witthauer ◽  
M. Dieterle ◽  
S. Abt ◽  
P. Achenbach ◽  
F. Afzal ◽  
...  
Keyword(s):  
Cross Sections ◽  
Polarization Observable ◽  
Protons And Neutrons ◽  
Double Polarization

scholarly journals Measurement of the double polarization observable G in π[sup 0]-and η-photoproduction

2010 ◽  
Author(s):  
Annika Thiel ◽  
Volker Crede ◽  
Paul Eugenio ◽  
A. Ostrovidov ◽  
Keyword(s):  
Polarization Observable ◽  
Double Polarization

scholarly journals First measurement of the polarization observable E and helicity-dependent cross sections in single π0 photoproduction from quasi-free nucleons

2017 ◽  
Vol 770 ◽  
pp. 523-531 ◽  
Author(s):  
M. Dieterle ◽  
L. Witthauer ◽  
F. Cividini ◽  
S. Abt ◽  
P. Achenbach ◽  
...  
Keyword(s):  
Cross Sections ◽  
Polarization Observable

EFFECT OF STRANGENESS FOR NEUTRINO-NUCLEON AND NEUTRINO-NUCLEUS SCATTERING IN QUASIELASTIC REGION

2009 ◽  
Vol 24 (11n13) ◽  
pp. 955-959
Author(s):  
K. S. KIM ◽  
MYUNG-KI CHEOUN ◽  
BYUNG GEEL YU
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Strange Quark ◽  
Neutral Current ◽  
Charged Current ◽  
Particle Model ◽  
Protons And Neutrons ◽  
Nucleus Scattering ◽  
Single Particle Model ◽  
The Cross

We present the neutral-current (NC) and charged-current (CC) reactions by incident neutrino (antineutrino) scattering on the nucleon, and also on the 12 C target in quasi-elastic region within the framework of a relativistic single particle model. Effects of the strangeness are studied on the cross sections, the ratios between the NC and CC reactions, and the asymmetries. We found that there exists some cancellation of the strange quark contributions between the knocked-out protons and neutrons in the neutrino (antineutrino)-nucleus scattering. The effect of the strangeness on the asymmetry exhibits larger than that on the ratio and the cross section.

scholarly journals QUASIFREE PHOTOPRODUCTION OF PION-PAIRS OF PROTONS AND NEUTRONS

2014 ◽  
Vol 26 ◽  
pp. 1460106
Author(s):  
◽  
M. OBERLE ◽  
B. KRUSCHE
Keyword(s):  
Cross Sections ◽  
Resonance Region ◽  
Electromagnetic Calorimeter ◽  
Final State ◽  
Model Calculations ◽  
Incident Photon ◽  
Free Neutron ◽  
Protons And Neutrons ◽  
Charged Pions ◽  
Comparison Of The Results

Beam-helicity asymmetries and mass-differential cross sections have been measured at the MAMI accelerator in Mainz for the photoproduction of neutral and mixed-charge pion pairs in the reactions γp → nπ0π+ and γp → pπ0π0 off free protons and γd → (p)pπ0π-, γd → (n)pπ0π0 and γd → (n)nπ0π+, γd → (p)nπ0π0 off quasi-free nucleons bound in the deuteron for incident photon energies up to 1.4 GeV. Circularly polarized photons were produced in bremsstrahlung processes of longitudinally polarized electrons and tagged with the Glasgow-Mainz magnetic spectrometer. The decay products (photons, protons neutrons and charged pions) were detected in the 4π electromagnetic calorimeter composed of the Crystal Ball and TAPS detectors. Using a full kinematic reconstruction of the final state, excellent agreement was found between the results for free and quasi-free protons, indicate that the quasi-free neutron results are also a close approximation of the free-neutron results. Comparison of the results to predictions of model calculations portend that especially the reaction mechanisms in the production of the mixed-charge final states are still not well understood, in particular at low incident photon energies in the second nucleon resonance region.

scholarly journals Double-polarization observable G in neutral-pion photoproduction off the proton

2017 ◽  
Vol 53 (1) ◽  
Author(s):  
A. Thiel ◽  
◽  
H. Eberhardt ◽  
M. Lang ◽  
F. Afzal ◽  
...  
Keyword(s):  
Neutral Pion ◽  
Pion Photoproduction ◽  
Polarization Observable ◽  
Double Polarization
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