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Threshold pi(0) photoproduction on transverse polarised protons at MAMI

Schumann, S. and Otte, P. B. and Akondi, C. S. and Annand, J. R. M. and Arends, H. -J. and Beck, R. and Bernstein, A. M. and Borisov, N. and Braghieri, A. and Briscoe, W. J. and Cherepnya, S. and Collicott, C. and Costanza, S. and Downie, E. J. and Dieterle, M. and Fernandez-Ramirez, C. and Fix, A. and Fil`kov, L. V. and Garni, S. and Glazier, D. I. and Gradl, W. and Gurevich, G. and Hall-Barrientos, P. and Hamilton, D. and Hornidge, D. and Howdle, D. and Huber, G. M. and Kashevarov, V. L. and Keshelashvili, I. and Kondratiev, R. and Korolija, M. and Krusche, B. and Lazarev, A. and Lisin, V. and Livingston, K. and MacGregor, I. J. D. and Mancel, J. and Manley, D. M. and Martel, P. P. and McNicoll, E. F. and Meyer, W. and Middleton, D. and Miskimen, R. and Mushkarenkov, A. and Nefkens, B. M. K. and Neganov, A. and Nikolaev, A. and Oberle, M. and Ostrick, M. and Ortega, H. and Ott, P. and Oussena, B. and Paudyal, D. and Pedroni, P. and Polonski, A. and Polyanski, V. V. and Prakhov, S. and Reicherz, G. and Rostomyan, T. and Sarty, A. and Sikora, M. H. and Sokhoyan, V. and Steffen, O. and Strakovsky, I. I. and Strub, Th. and Supek, I. and Tiator, L. and Thomas, A. and Unverzagt, M. and Usov, Yu. A. and Watts, D. P. and Werthmueller, D. and Witthauer, L. and Wolfes, M.. (2015) Threshold pi(0) photoproduction on transverse polarised protons at MAMI. Physics letters B, 750. pp. 252-258.

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Official URL: http://edoc.unibas.ch/40402/

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Abstract

Polarisation-dependent differential cross sections sigma(T) associated with the target asymmetry T have been measured for the reaction gamma (p)over arrow -> p pi(0) with transverse target polarisation from pi(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 sigma(T) have been used in combination with our previous measurements of the unpolarised cross section sigma(0) and the beam asymmetry Sigma for a model-independent determination of S- and P-wave multipoles in the pi(0) threshold region, which includes for the first time a direct determination of the imaginary part of the E0+ multipole. (C) 2015 The Authors. Published by Elsevier B.V.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Elsevier B.V.
ISSN:0370-2693
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:30 Jun 2016 11:01
Deposited On:09 May 2016 08:47

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