Title of article
Precise measurement of Σ beam asymmetry for positive pion photoproduction on the proton from 800 to 1500 MeV
Author/Authors
GRAAL Collaboration، نويسنده , , O Bartalini، نويسنده , , V Bellini، نويسنده , , J.-P Bocquet، نويسنده , , M Capogni، نويسنده , , M Castoldi، نويسنده , , A DʹAngelo، نويسنده , , J.-P Didelez، نويسنده , , R Di Salvo، نويسنده , , A Fantini، نويسنده , , G Gervino، نويسنده , , F Ghio، نويسنده , , B Girolami، نويسنده , , M. Guidal، نويسنده , , E. Hourany، نويسنده , , V Kouznetsov، نويسنده , , R Kunne، نويسنده , , A Lapik، نويسنده , , P. Levi Sandri، نويسنده , , A. Lleres، نويسنده , , et al.، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2002
Pages
8
From page
113
To page
120
Abstract
The Σ beam asymmetry for positive pion photoproduction on the proton has been measured over an angular range of 40–170° at photon energies from 0.8 to 1.5 GeV. The resulting data set includes 237 accurate points, 136 of these belonging to an almost unexplored domain above 1.05 GeV. Data of such high precision provide severe constraints for partial wave analyses. The influence of this experiment on the GW multipole analysis is demonstrated. Significant changes are found in multipoles connected to the S31(1620) and P13(1720) resonances. Comparisons using the MAID analysis are also presented.
Keywords
Partial wave analysis , ?+ photoproduction , Baryon resonances , Polarization observables , Photon beam asymmetry
Journal title
PHYSICS LETTERS B
Serial Year
2002
Journal title
PHYSICS LETTERS B
Record number
916159
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