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In-medium omega mass from the gamma+Nb -< pi(0)gamma+X reaction

Nanova, M. and Metag, V. and Anton, G. and Bacelar, J. C. S. and Bartholomy, O. and Bayadilov, D. and Beloglazov, Y. A. and Bogendoerfer, R. and Castelijns, R. 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 Gothe, R. and Gregor, R. and Gridnev, A. B. and Gutz, E. and Hoeffgen, S. and Hoffmeister, P. and Horn, I. and Hoessl, J. and Jaegle, I. and Junkersfeld, J. and Kalinowsky, H. and Klein, Frank and Klein, Friedrich and Klempt, E. and Konrad, M. and Kopf, B. and Kotulla, M. and Krusche, B. and Langheinrich, J. and Lohner, 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 Shende, S. and Suft, G. and Suele, A. and Sumachev, V. V. and Szczepanek, T. and Thoma, U. and Trnka, D. and Varma, R. and Walther, D. and Weinheimer, Ch. and Wendel, Ch.. (2010) In-medium omega mass from the gamma+Nb -< pi(0)gamma+X reaction. Physical review. C, Nuclear physics, Vol. 82, H. 3 , 035209.

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Official URL: http://edoc.unibas.ch/dok/A5842044

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Abstract

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 absolute magnitude of the background directly from the data. Details of the reanalysis and of the background determination are described. The omega signal on the Nb target, extracted in the reanalysis, does not show a deviation from the corresponding line shape on a LH2 target, measured as reference. The earlier claim of an in-medium mass shift is thus not confirmed. The sensitivity of the omega line shape to different in-medium modification scenarios is discussed.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Institute of Physics
ISSN:0556-2813
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:14 Sep 2012 07:18
Deposited On:14 Sep 2012 06:47

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