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Threshold π0 photoproduction on transverse polarised protons at MAMI

(A2 Collaboration at MAMI) Schumann, S.; Supek, Ivan; Wolfes, M.; Korolija, Milorad; Mekterović, Darko (2015) Threshold π0 photoproduction on transverse polarised protons at MAMI. Physics Letters B, 750 . pp. 252-258. ISSN 0370-2693

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Polarisation-dependent differential cross sections σTσT associated with the target asymmetry T have been measured for the reaction View the MathML sourceγp→→pπ0 with transverse target polarisation from π0π0 threshold to photon energies of 190 MeV. The data were obtained using a frozen-spin butanol target with the Crystal Ball / TAPS detector set-up and the Glasgow photon tagging system at the Mainz Microtron MAMI. Results for σTσT have been used in combination with our previous measurements of the unpolarised cross section σ0σ0 and the beam asymmetry Σ for a model-independent determination of S- and P -wave multipoles in the π0π0 threshold region, which includes for the first time a direct determination of the imaginary part of the E0+E0+ multipole.

Item Type: Article
Uncontrolled Keywords: threshold π 0 photoproduction; target asymmetry; electromagnetic multipoles
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Depositing User: Ivan Supek
Date Deposited: 25 Apr 2016 09:56
DOI: 10.1016/j.physletb.2015.09.015

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