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)+35-5(syst)] MeV/c(2) has been deduced at an estimated average nuclear density of 0.6rho(0).
| Entry Date(s): |
Date Created: 20050811 Date Completed: 20050913 Latest Revision: 20050810 |
| Update Code: |
20221213 |
| DOI: |
10.1103/PhysRevLett.94.192303 |
| PMID: |
16090166 |
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| Autor: |
Trnka D; II. Physikalisches Institut, Universität Giessen, Germany., Anton G, Bacelar JC, Bartholomy O, Bayadilov D, Beloglazov YA, Bogendörfer R, Castelijns R, Crede V, Dutz H, Ehmanns A, Elsner D, Ewald R, Fabry I, Fuchs M, Essig K, Funke Ch, Gothe R, Gregor R, Gridnev AB, Gutz E, Höffgen S, Hoffmeister P, Horn I, Hössl J, Jaegle I, Junkersfeld J, Kalinowsky H, Klein F, Klein F, Klempt E, Konrad M, Kopf B, Kotulla M, Krusche B, Langheinrich J, Löhner H, Lopatin IV, Lotz J, Lugert S, Menze D, Messchendorp JG, Mertens T, Metag V, Morales C, Nanova M, Novotny R, Ostrick M, Pant LM, van Pee H, Pfeiffer M, Roy A, Radkov A, Schadmand S, Schmidt Ch, Schmieden H, Schoch B, Shende S, Suft G, Sumachev VV, Szczepanek T, Süle A, Thoma U, Varma R, Walther D, Weinheimer Ch, Wendel Ch |
| Jazyk: |
angličtina |
| Zdroj: |
Physical review letters [Phys Rev Lett] 2005 May 20; Vol. 94 (19), pp. 192303. Date of Electronic Publication: 2005 May 19. |
| DOI: |
10.1103/PhysRevLett.94.192303 |
| Abstrakt: |
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)+35-5(syst)] MeV/c(2) has been deduced at an estimated average nuclear density of 0.6rho(0). |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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