In-medium omega mass from the gamma+Nb -> pi(0)gamma+X reaction
- Nanova, M.
- Metag, V.
- Anton, G.
- Bacelar, J. C. S.
- Bartholomy, O.
- Bayadilov, D.
- Beloglazov, Y. A.
- Bogendoerfer, R.
- Castelijns, R.
- Crede, V.
- Dutz, H.
- Ehmanns, A.
- Elsner, D.
- Essig, K.
- Ewald, R.
- Fabry, I.
- Fuchs, M.
- Funke, Ch.
- Gothe, R.
- Gregor, R.
- Gridnev, A. B.
- Gutz, E.
- Hoeffgen, S.
- Hoffmeister, P.
- Horn, I.
- Hoessl, J.
- Jaegle, I.
- Junkersfeld, J.
- Kalinowsky, H.
- Klein, Frank
- Klein, Friedrich
- Klempt, E.
- Konrad, M.
- Kopf, B.
- Kotulla, M.
- Krusche, B.
- Langheinrich, J.
- Löhner, Herbert
- Lopatin, I. V.
- Lotz, J.
- Lugert, S.
- Menze, D.
- Mertens, T.
- Messchendorp, J. G.
- Morales, C.
- Novotny, R.
- Ostrick, M.
- Pant, L. M.
- Schadmand, S.
- Shende, S.
DOIAbstract
Data on the photoproduction of omega mesons on nuclei have been reanalyzed in a search for in-medium modifications. The data were taken with the crystal barrel (CB)/two-arm photon spectrometer (TAPS) detector system at the ELectron Stretcher Anlage (ELSA) accelerator facility in Bonn. First results from the analysis of the data set were published by Trnka et al. [Phys. Rev. Lett. 94, 192303 (2005)], claiming a lowering of the. mass in the nuclear medium by 14% at normal nuclear matter density. The extracted. line shape was found to be sensitive to the background subtraction. For this reason a reanalysis of the same data set has been initiated, and a new method has been developed to reduce the background and to determine the shape and absolu...
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