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25 April 2024

» arxiv » 1204.2914

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Transparency ratio in gamma A -> eta' A' and the in-medium eta' width
M. Nanova ; V. Metag ; A. Ramos ; E. Oset ; I. Jaegle ; K. Makonyi ; K. Brinkmann ; O. Bartholomy ; D. Bayadilov ; Y.A. Beloglazov ; V. Crede ; H. Dutz ; A. Ehmanns ; D. Elsner ; K. Essig ; R. Ewald ; I. Fabry ; M. Fuchs ; Ch. Funke ; R. Gregor ; A.B. Gridnev ; E. Gutz ; S. Höffgen ; P. Hoffmeister ; I. Horn ; J. Junkersfeld ; H. Kalinowsky ; Frank Klein ; Friedrich Klein ; E. Klempt ; M. Konrad ; B. Kopf ; B. Krusche ; J. Langheinrich ; H. Löhner ; I.V. Lopatin ; J. Lotz ; S. Lugert ; D. Menze ; T. Mertens ; J.G. Messchendorp ; C. Morales ; R. Novotny ; M. Ostrick ; L.M. Pant ; H. van Pee ; M. Pfeiffer ; A. Roy ; A. Radkov ; S. Schadmand ; Ch. Schmidt ; H. Schmieden ; B. Schoch ; A. Süle ; V. V. Sumachev ; T. Szczepanek ; U. Thoma ; D. Trnka ; R. Varma ; D. Walther ; Ch. Wendel ;
Date:	13 Apr 2012
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 ho = ho_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 = 0.84pm0.03 has been deduced.
Source:	arXiv, 1204.2914
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