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Observation of a unitary cusp in the threshold γp→π0p reaction

Bernstein, A. M. and Shuster, E. and Beck, R. and Fuchs, M. and Krusche, B. and Merkel, H. and Stroher, H.. (1997) Observation of a unitary cusp in the threshold γp→π0p reaction. Physical review. C, Nuclear physics, Vol. 55, H. 3. pp. 1509-1516.

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Official URL: http://edoc.unibas.ch/dok/A5261983

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Abstract

A rigorous multipole analysis of the recent gamma p-<pi(0)p cross-section measurement is presented. The data were taken using the photon spectrometer TAPS at the tagged photon beam of the Mainz microtron. The s and p wave multipoles were extracted using minimal model assumptions. The predicted unitary cusp for the s-wave multipole E(0+) due to the two step gamma p-<pi(+)n-<pi(0)p reaction was observed. The results are consistent with one-loop chiral perturbation theory calculations for which three low-energy constants have been determined by a fit to the data. The uncertainties in the analysis and the need for polarization observables are discussed.
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:American Institute of Physics
ISSN:0556-2813
Note:Variant title: Observation of a unitary cusp in the threshold gamma p-<pi(0)p reaction -- Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:25
Deposited On:22 Mar 2012 13:49

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