Threshold π0 photoproduction on transverse polarised protons at MAMI

Schumann, S. et al. (2015) Threshold π0 photoproduction on transverse polarised protons at MAMI. Physics Letters B, 750, pp. 252-258. (doi:10.1016/j.physletb.2015.09.015)

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Abstract

Abstract: Polarisation-dependent differential cross sections σT associated with the target asymmetry T have been measured for the reaction γp→→pπ0 with transverse target polarisation from π0 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 σT have been used in combination with our previous measurements of the unpolarised cross section σ0 and the beam asymmetry Σ for a model-independent determination of S - and P -wave multipoles in the π0 threshold region, which includes for the first time a direct determination of the imaginary part of the E0+ multipole.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Glazier, Dr Derek and Werthmueller, Dr Dominik and MacGregor, Professor I and Livingston, Dr Kenneth and Howdle, Mr David and Annand, Dr John and Hamilton, Dr David
Authors: Schumann, S., Otte, P. B., Akondi, C. S., Annand, J.R.M., Arends, H. J., Beck, R., Bernstein, A. M., Borisov, N., Braghieri, A., Briscoe, W. J., Cherepnya, S., Collicott, C., Costanza, S., Downie, E. J., Dieterle, M., Fernandez-Ramirez, C., Fix, A., Filkov, L. V., Garni, S., Glazier, D.I., Gradl, W., Gurevich, G., Hall-Barrientos, P., Hamilton, D., Hornidge, D., Howdle, D., Huber, G. M., Kashaverov, V. L., Keshalashvili, I., Kondratiev, R., Korolija, M., Krusche, B., Lazarev, A., Lisin, V., Livingston, K., MacGregor, I.J.D., Mancel, J., Manley, D. M., Martel, P. P., McNicoll, E. F., Meyer, W., Middleton, D., Miskimen, R., Mushkarenkov, A., Nefkens, B. M. K., Neganov, A., Nikolaev, A., Oberle, M., Ostrick, M., Ortega, H., Ott, P., Oussena, B., Paudyal, D., Pedroni, P., Polonski, A., Polyanski, V. V., Prakhok, S., Reicherz, G., Rostomyan, T., Sarty, A., Sikora, M. H., Sokhoyan, V., Steffen, O., Strakovsky, I. I., Strub, T., Supek, I., Tiator, L., Thomas, A., Unversagt, M., Usov, Y. A., Watts, D. P., Werthmueller, D., Witthauer, L., and Wolfes, M.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physics Letters B
Journal Abbr.:PLB
Publisher:Elsevier BV
ISSN:0370-2693
ISSN (Online):1793-6640
Copyright Holders:Copyright © 2015 The Authors
First Published:First published in Physics Letters B 750:252-258
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
507271Illuminating strongly interacting matterI MacgregorScience & Technologies Facilities Council (STFC)ST/G008604/1P&A - PHYSICS & ASTRONOMY