Beam Asymmetries in π[sup 0] Photoproduction on the Proton

2010 ◽  
Author(s):  
Nathan Sparks ◽  
Volker Crede ◽  
Paul Eugenio ◽  
A. Ostrovidov ◽  
Keyword(s):  
Beam Asymmetries

scholarly journals Light-Meson Spectroscopy at GlueX

2018 ◽  
Vol 46 ◽  
pp. 1860029 ◽  
Author(s):  
Alexander Austregesilo
Keyword(s):  
Light Meson ◽  
Meson Spectrum ◽  
Amplitude Analysis ◽  
Hydrogen Target ◽  
Data Set ◽  
Early Results ◽  
Meson Spectroscopy ◽  
Beam Asymmetries ◽  
Linearly Polarized ◽  
Pseudo Scalar

GlueX at Jefferson Lab aims to study the light meson spectrum with an emphasis on the search for light hybrid mesons. To this end, a linearly-polarized [Formula: see text]GeV photon beam impinges on a hydrogen target contained within a hermetic detector with near-complete neutral and charged particle coverage. In 2016, the experiment completed its commissioning and subsequently started to take data in its design configuration. With the size of the data set so far, GlueX already exceeds previous experiments for polarized photoproduction in this energy regime. A selection of early results will be presented, focusing on beam asymmetries for pseudo-scalar and vector mesons. The potential to make significant contributions to the field of light-meson spectroscopy is highlighted by the observation of several known meson resonances. Furthermore, the strategy to map the light meson spectrum with amplitude analysis tools will be outlined.

η and π° Photoproduction on the Deuteron: Beam Asymmetries

NSTAR 2004 ◽  
2004 ◽  
Author(s):  
A. FANTINI ◽  
O. BARTALINI ◽  
V. BELLINI ◽  
J.P BOCQUET ◽  
M. CASTOLDI ◽  
...  
Keyword(s):  
Deuteron Beam ◽  
Beam Asymmetries

Sources of Helicity-correlated Electron Beam Asymmetries

2009 ◽  
Author(s):  
K. D. Paschke ◽  
Donald G. Crabb ◽  
Yelena Prok ◽  
Matt Poelker ◽  
Simonetta Liuti ◽  
...  
Keyword(s):  
Electron Beam ◽  
Correlated Electron ◽  
Beam Asymmetries

scholarly journals Weak effects in proton beam asymmetries at polarised RHIC and beyond

2006 ◽  
Vol 643 (2) ◽  
pp. 86-92 ◽  
Author(s):  
S. Moretti ◽  
M.R. Nolten ◽  
D.A. Ross
Keyword(s):  
Proton Beam ◽  
Beam Asymmetries

ω PHOTOPRODUCTION AT GRAAL

2010 ◽  
Vol 19 (05n06) ◽  
pp. 1241-1248 ◽  
Author(s):  
V. VEGNA ◽  
V. BELLINI ◽  
J. P. BOCQUET ◽  
L. CASANO ◽  
A. D'ANGELO ◽  
...  
Keyword(s):  
Cross Sections ◽  
Radiative Decay ◽  
Data Consistency ◽  
Free Nucleon ◽  
Beam Asymmetry ◽  
Free Proton ◽  
Consistency Results ◽  
Beam Asymmetries ◽  
Comparison Of The Results ◽  
Good Agreement

The study of meson photoproduction on the nucleon is a very important tool to complete the puzzle of baryon excited states. GRAAL aim is the measurement of cross sections and of beam asymmetries for all the photonuclear reactions accessible in the energy range from 600 MeV up to 1.5 GeV. In the following preliminary results of the Σ beam asymmetry for ω photoproduction on the free proton in Hydrogen and on the quasi-free nucleon in Deuterium are shown. GRAAL is the first experiment in which both the charged and the radiative decay of ω meson are studied. Since the beam asymmetry is independent of the decay mode, the comparison of the results from the two channel allows an important check on data consistency. Results on the free proton are in good agreement with theoretical prediction from Zhao model and confirm the presence of P13(1720) state. The analysis performed for the radiative decay is applied to the process of ω photoproduction on the quasi free nucleon in Deuterium.

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