Threshold π[superscript 0] photoproduction on transverse polarised protons at MAMI
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Author(s)
Schumann, Sven W
Martel, Philippe Paul
Bernstein, Aron M.
Date Issued
November 2015
Journal
Physics Letters B
Publisher
Elsevier
Citation
Schumann, S., et al. “Threshold π[superscript 0] Photoproduction on Transverse Polarised Protons at MAMI.” Physics Letters B, vol. 750, Nov. 2015, pp. 252–58. © 2015 The Authors
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Author's final manuscript
Abstract
Polarisation-dependent differential cross sections σ[superscript T] associated with the target asymmetry T have been measured for the reaction γ[→ over p]→pπ[superscript 0] with transverse target polarisation from π[superscript 0] 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 σ[superscript T] have been used in combination with our previous measurements of the unpolarised cross section σ[superscript 0] and the beam asymmetry σ for a model-independent determination of S- and P-wave multipoles in the π[superscript 0] threshold region, which includes for the first time a direct determination of the imaginary part of the E[subscript 0+] multipole.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2015.09.015
