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Transparency ratio in gamma A -< eta ` A ` and the in-medium eta ` width

Nanova, M. and Metag, V. and Ramos, A. and Oset, B. E. and Jaegle, I. and Makonyi, K. and Brinkmann, K. and Bartholomy, O. and Bayadilov, D. and Beloglazov, V. A. and Crede, V. and Dutz, H. and Ehmanns, A. and Elsner, D. and Essig, K. and Ewald, R. and Fabry, I. and Fuchs, M. and Funke, Ch. and Gregor, R. and Gridnev, A. B. and Gutz, E. and Hoeffgen, S. and Hoffmeister, P. and Horn, I. and Junkersfeld, J. and Kalinowsky, H. and Klein, Frank and Klein, Friedrich and Klempt, E. and Konrad, M. and Kopf, B. and Krusche, B. and Langheinrich, J. and Loehner, H. and Lopatin, I. V. and Lotz, J. and Lugert, S. and Menze, D. and Mertens, T. and Messchendorp, J. G. and Morales, C. and Novotny, R. and Ostrick, M. and Pant, L. M. and van Pee, H. and Pfeiffer, M. and Roy, A. and Radkov, A. and Schadmand, S. and Schmidt, Ch. and Schmieden, H. and Schoch, B. and Suele, A. and Sumachev, V. V. and Szczepanek, T. and Thoma, U. and Trnka, D. and Varma, R. and Walther, D. and Wendel, Ch.. (2012) Transparency ratio in gamma A -< eta ` A ` and the in-medium eta ` width. Physics letters. B, Vol. 710, H. 4-5. pp. 600-606.

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Official URL: http://edoc.unibas.ch/dok/A6070661

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Abstract

The photoproduction of eta`-mesons off different nuclei has been measured with the CBELSA/TAPS detector system for incident photon energies between 1500-2200 MeV. The transparency ratio has been deduced and compared to theoretical calculations describing the propagation of eta`-mesons in nuclei. The comparison indicates a width of the eta`-meson of the order of Gamma = 15-25 MeV at rho = rho(0) for an average momentum p(eta`) = 1050 MeV/c, at which the eta`-meson is produced in the nuclear rest frame. The inelastic eta`N cross section is estimated to be 3-10 mb. Parameterizing the photoproduction cross section of eta`-mesons by sigma(A) = sigma(0)A(alpha), a value of alpha = 0.84 +/- 0.03 has been deduced. (C) 2012 Elsevier B.V. All rights reserved.
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:North-Holland
ISSN:0370-2693
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:01 Mar 2013 11:13
Deposited On:01 Mar 2013 11:09

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