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Transparency ratio in \gamma A -> \eta' A' and the in-medium \eta' width

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arxiv 1204.2914 v1 pith:JBFGIOCL submitted 2012-04-13 nucl-ex

M. Nanova , V. Metag , A. Ramos , E. Oset , I. Jaegle , K. Makonyi , K. Brinkmann , O. Bartholomy
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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
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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\pm0.03 has been deduced.

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  1. Comprehensive study of mass modifications of light mesons in nuclear matter in the three-flavor extended Linear Sigma Model

    nucl-th 2019-08 conditional novelty 6.0 of 10

    Combining the extended Linear Sigma Model with a parity doublet nucleon model, this paper predicts that most light meson masses drop in nuclear matter and favors a chiral invariant mass M0 around 0.8 GeV.

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