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New results on the Roper resonance and the P-11 partial wave

Sarantsev, A. V. and Fuchs, M. and Kotulla, M. and Thoma, U. and Ahrens, J. and Annand, J. R. M. and Anisovich, A. V. and Anton, G. and Bantes, R. and Bartholomy, O. and Beck, R. and Beloglazov, Yu. and Castelijns, R. and Crede, V. and Ehmanns, A. and Ernst, J. and Fabry, I. and Flemming, H. and Foesel, A. and Funke, Chr. and Gothe, R. and Gridnev, A. and Gutz, E. and Hoeffgen, St. and Horn, I. and Hoessl, J. and Hornidge, D. and Janssen, S. and Junkersfeld, J. and Kalinowsky, H. and Klein, F. and Klempt, E. and Koch, H. and Konrad, M. and Kopf, B. and Krusche, B. and Langheinrich, J. and Loehner, H. and Lopatin, I. and Lotz, J. and McGeorge, J. C. and MacGregor, I. J. D. and Matthaey, H. and Menze, D. and Messchendorp, J. G. and Metag, V. and Nikonov, V. A. and Novinski, D. and Novotny, R. and Ostrick, M. and van Pee, H. and Pfeiffer, M. and Radkov, A. and Rosner, G. and Rost, M. and Schmidt, C. and Schoch, B. and Suft, G. and Sumachev, V. and Szczepanek, T. and Walther, D. and Watts, D. P. and Weinheimer, Chr.. (2008) New results on the Roper resonance and the P-11 partial wave. Physics letters. B, Vol. 659, H. 1-2. pp. 94-100.

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Official URL: http://edoc.unibas.ch/dok/A5261926

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Abstract

Properties of the Roper resonance, the first scalar excitation of the nucleon, are determined. Pole positions and residues of the P-11 partial wave are studied in a combined analysis of pion- and photo-induced reactions. We find the Roper pole at (1371 +/- 7) - i(92 +/- 10) MeV and an elasticity of 0.61 +/- 0.03. The largest decay coupling is found for the N sigma (sigma = (pi pi)-S-wave). The analysis is based on new data on gamma p -< p pi(0)pi(0) for photons in the energy range from the two-pion threshold to 820 MeV from TAPS at Mainz and from 0.4 to 1.3 GeV from Crystal Barrel at Bonn and includes further data from other experiments. The partial wave analysis excludes the possibility that the Roper resonance is split into two states with different partial decay widths.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:North-Holland
ISSN:0370-2693
Note: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 13:54

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