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Linearly polarised photon beams at ELSA and measurement of the beam asymmetry in π⁰ photoproduction off the proton

Elsner, D. and Bantes, B. and Bartholomy, O. and Bayadilov, D. E. and Beck, R. and Beloglazov, Y. A. and Castelijns, R. and Crede, V. and Ehmanns, A. and Essig, K. and Ewald, R. and Fabry, I. and Frommberger, F. and Fornet-Ponse, K. and Fuchs, M. and Funke, C. and Gridnev, A. B. and Gutz, E. and Hillert, W. and Hoffgen, S. and Hoffmeister, P. and Horn, I. and Jaegle, I. and Junkersfeld, J. and Kalinowsky, H. and Klein, Frank and Klein, Friedrich and Klempt, E. and Konrad, M. and Kotulla, M. and Krusche, B. and Loehner, H. and Lopatin, I. V. and Lotz, J. and Lugert, S. and Menze, D. and Mertens, T. and Messchendorp, J. G. and Metag, V. and Morales, C. and Nanova, M. and Novinski, D. V. and Novotny, R. and Ostrick, M. and Pant, L. M. and van Pee, H. and Pfeiffer, M. and Sarantsev, A. V. and Schmidt, C. and Schmieden, H. and Schoch, B. and Shende, S. and Sule, A. and Sumachev, V. V. and Szczepanek, T. and Thoma, U. and Trnka, D. and Walther, D. and Weinheimer, C. and Wendel, C.. (2009) Linearly polarised photon beams at ELSA and measurement of the beam asymmetry in π⁰ photoproduction off the proton. The European physical journal. A, Hadrons and nuclei, Vol. 39, H. 3. pp. 373-381.

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Official URL: http://edoc.unibas.ch/dok/A5261910

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Abstract

At the electron accelerator ELSA a linearly polarised tagged photon beam is produced by coherent bremsstrahlung off a diamond crystal. Orientation and energy range of the linear polarisation can be deliberately chosen by accurate positioning of the crystal with a goniometer. The degree of polarisation is determined by the form of the scattered electron spectrum. Good agreement between experiment and expectations on the basis of the experimental conditions is obtained. Polarisation degrees of P-gamma = 40% are typically achieved at half of the primary electron energy. The determination of P-gamma is confirmed by measuring the beam asymmetry, Sigma, in pi(0) photoproduction and by a comparison of the results to independent measurements using laser backscattering.
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:Springer-Verlag
ISSN:1434-6001
Note:Variant title: Linearly polarised photon beams at ELSA and measurement of the beam asymmetry in pi(0) photoproduction off the proton -- Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:26
Deposited On:22 Mar 2012 13:55

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