scholarly journals Photon beam asymmetry Σ for η and η′ photoproduction from the proton

2017 ◽  
Vol 771 ◽  
pp. 213-221 ◽  
Author(s):  
P. Collins ◽  
B.G. Ritchie ◽  
M. Dugger ◽  
A.V. Anisovich ◽  
M. Döring ◽  
...  
Keyword(s):  
Photon Beam ◽  
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

scholarly journals A NEW MEASUREMENT OF BEAM ASYMMETRY IN PION PHOTOPRODUCTION FROM THE NEUTRON USING CLAS

2009 ◽  
Vol 24 (02n03) ◽  
pp. 497-500
Author(s):  
◽  
D. SOKHAN ◽  
D. WATTS ◽  
D. BRANFORD ◽  
F. KLEIN
Keyword(s):  
Energy Range ◽  
Excitation Spectrum ◽  
Preliminary Analysis ◽  
Pion Photoproduction ◽  
Photon Beam ◽  
Data Set ◽  
Beam Asymmetry ◽  
Large Acceptance ◽  
Photoproduction Reaction ◽  
Neutron Excitation

We present a preliminary analysis of the photon beam asymmetry observable (Σ) from the photoproduction reaction channel γn → π-p. This new data was obtained using the near-4π CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Laboratory, USA, employing a linearly polarised photon beam with an energy range 1.1 - 2.3 GeV. The measurement will provide new data to address the poorly established neutron excitation spectrum and will greatly expand the sparse world data-set both in energy and angle.

scholarly journals Photon beam asymmetry Σ in the reaction γ→p→pω for E= 1.152 to 1.876 GeV

2017 ◽  
Vol 773 ◽  
pp. 112-120 ◽  
Author(s):  
P. Collins ◽  
B.G. Ritchie ◽  
M. Dugger ◽  
F.J. Klein ◽  
A.V. Anisovich ◽  
...  
Keyword(s):  
Photon Beam ◽  
Beam Asymmetry

scholarly journals Photoproduction of the Λ(1520) hyperon with a 9 GeV photon beam at GlueX

2020 ◽  
Vol 1643 (1) ◽  
pp. 012175
Author(s):  
Peter Pauli
Keyword(s):  
Electron Beam ◽  
Partial Wave Analysis ◽  
Photon Beam ◽  
Spin Density Matrix ◽  
Final State ◽  
Accelerator Facility ◽  
Beam Asymmetry ◽  
Exotic Mesons ◽  
Newport News ◽  
Wide Range

Abstract The GlueX experiment is located at the Thomas Jefferson National Accelerator Facility (JLab) in Newport News, VA, USA. It features a hermetic 4π detector with excellent tracking and calorimetry capabilities. Its 9 GeV linearly polarized photon beam is produced from the 12 GeV electron beam, delivered by JLab’s Continuous Electron Beam Accelerator Facility (CEBAF), via bremsstrahlung on a thin diamond and is incident on a LH2 target. GlueX recently finished its first data taking period and published first results. The main goal of GlueX is to measure gluonic excitations of mesons. These so-called hybrid or exotic mesons are predicted by Quantum Chromodynamics (QCD) but haven’t been experimentally confirmed yet. They can have quantum numbers not accessible by ordinary quark-antiquark pairs which helps in identifying them using partial wave analysis techniques. The search for exotic mesons requires a very good understanding of photoproduction processes in a wide range of final states, one of them being pK + K − which contains many meson and baryon reactions. The Λ(1520) is a prominent hyperon resonance in this final state and is the subject of this presentation. This talk will give an introduction to the GlueX experiment and show preliminary results for the photoproduction of the Λ(1520) hyperon. The measurement of important observables like the photon beam asymmetry and spin-density matrix elements will be discussed and an outlook to possible measurements of further hyperon states in the pK + K − final state will be given.

THE γp → K0Σ+ PHOTOPRODUCTION REACTION

2014 ◽  
Vol 26 ◽  
pp. 1460087
Author(s):  
◽  
HARTMUT SCHMIEDEN
Keyword(s):  
Cross Section ◽  
Electron Accelerator ◽  
Photon Beam ◽  
Reaction Channel ◽  
Quasibound State ◽  
Accelerator Facility ◽  
Beam Asymmetry ◽  
The Cross ◽  
Photoproduction Reaction ◽  
The University

The photoproduction reaction γp → K0Σ+ was investigated with the CBELSA/TAPS experiment at the electron accelerator facility ELSA of the University of Bonn. A pronounced structure in the cross section was found at the K* threshold. There are indications that this may be associated with the formation of a K*-hyperon quasibound state below the K* threshold. The very first measurements of the photon beam asymmetry in the studied reaction channel are presented and their impact is discussed.

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