Observation of In-Medium Modifications of the Omega Meson

Trnka, D.; Gridnev, A. B.; Loehner, H.; Bacelar, J. C. S.; Junkersfeld, J.; Hoeffgen, S.; Kotulla, M.; Nanova, M.; Szczepanek, T.; Hoffmeister, P.; Novotny, R.; Horn, I.; Metag, V.; van Pee, H.; Lotz, J.; Konrad, M.; Suele, A.; Bartholomy, O.; Castelijns, R.; Schmieden, H.; Beloglazov, Y. A.; Kopf, B.; Klein, F.; Langheinrich, J.; Radkov, J. O.; Klempt, E.; Anton, G.; Schmidt, Ch.; Ostrick, M.; Gothe, R.; Thoma, U.; Jaegle, I.; Schadmand, S.; Funke, R. J.; Crede, V.; Sumachev, V. V.; Dutz, H.; Krusche, B.; Varma, R.; Gutz, E.; Gregor, R.; Weinheimer, Ch.; Fuchs, M.; Pant, L. M.; Fabry, I.; Messchendorp, J. G.; Ewald, R.; Hoessl, J.; Kalinowsky, H.; Elsner, M. P.; Suft, G.; Bayadilov, D.; Essig, K.; Roy, A.; Shende, S.; Lopatin, I. V.; Schoch, B.; Pfeiffer, M.; Walther, D.; Mertens, T.; Wendel, Ch.; Morales, C.; Lugert, S.; Menze, D.; Bogendoerfer, R.; Ehmanns, A.

doi:10.1103/PhysRevLett.94.192303

Journal Article

Observation of In-Medium Modifications of the Omega Meson

Trnka, D. ; Anton, G. ; Bacelar, J. C. S. ; Bartholomy, O. ; Bayadilov, D. ; Beloglazov, Y. A. ; Bogendoerfer, R. ; Castelijns, R.FZJ* ; Crede, V. ; Dutz, H. ; Ehmanns, A. ; Elsner, M. P. ; Ewald, R. ; Fabry, I. ; Fuchs, M. ; Essig, K. ; Funke, R. J. ; Gothe, R. ; Gregor, R. ; Gridnev, A. B. ; Gutz, E. ; Hoeffgen, S. ; Hoffmeister, P. ; Horn, I. ; Hoessl, J. ; Jaegle, I. ; Junkersfeld, J. ; Kalinowsky, H. ; Klein, F. ; Klein, F. ; Klempt, E. ; Konrad, M. ; Kopf, B. ; Kotulla, M. ; Krusche, B. ; Langheinrich, J. ; Loehner, H. ; Lopatin, I. V. ; Lotz, J. ; Lugert, S. ; Menze, D. ; Messchendorp, J. G. ; Mertens, T. ; Metag, V. ; Morales, C. ; Nanova, M. ; Novotny, R. ; Ostrick, M. ; Pant, L. M. ; van Pee, H. ; Pfeiffer, M.FZJ* ; Roy, A. ; Radkov, J. O. ; Schadmand, S.FZJ* ; Schmidt, C. ; Schmieden, H. ; Schoch, B. ; Shende, S. ; Suft, G. ; Sumachev, V. V. ; Szczepanek, T. ; Suele, A. ; Thoma, U. ; Varma, R.FZJ* ; Walther, D. ; Weinheimer, C. ; Wendel, C.

2005
APS College Park, Md.

Physical review letters 94, 192303 (2005) [10.1103/PhysRevLett.94.192303]

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Please use a persistent id in citations: http://hdl.handle.net/2128/1658 doi:10.1103/PhysRevLett.94.192303

Abstract: The photoproduction of omega mesons on nuclei has been investigated using the Crystal Barrel/TAPS experiment at the ELSA tagged photon facility in Bonn. The aim is to study possible in-medium modifications of the omega meson via the reaction gamma+A ->omega+X ->pi(0)gamma+X-'. Results obtained for Nb are compared to a reference measurement on a LH2 target. While for recoiling, long-lived mesons (pi(0), eta, and eta(')), which decay outside of the nucleus, a difference in the line shape for the two data samples is not observed, we find a significant enhancement towards lower masses for omega mesons produced on the Nb target. For momenta less than 500 MeV/c an in-medium omega meson mass of M-medium=[722(-4)(+4)(stat)(-5)(+35)(syst)] MeV/c(2) has been deduced at an estimated average nuclear density of 0.6 rho(0).

Keyword(s): photon nucleus: inclusive reaction ; deuteron ; niobium ; omega(783): photoproduction ; omega(783): radiative decay ; mass spectrum: (pi0 photon) ; omega(783): mass ; omega(783): momentum ; nuclear matter: density ; experimental results ; Bonn ELSA Stor ; photon nucleus --> omega(783) anything ; omega(783) --> pi0 photon ; 0.64-2.53 GeV