$Modification of the $\omega$-Meson Lifetime in Nuclear Matter$

Modification of the $\omega$-Meson Lifetime in Nuclear Matter

The photo production of $\omega$ mesons on the nuclei C, Ca, Nb and Pb has been measured using the Crystal Barrel/TAPS detector at the ELSA tagged photon facility in Bonn. The dependence of the $\omega$ meson cross section on the nuclear mass number has been compared with three different types o...

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Veröffentlicht in:	arXiv.org 2008-02
Hauptverfasser:	Kotulla, M, Trnka, D, Mühlich, P, Anton, G, Bacelar, J C S, Bartholomy, O, Bayadilov, D, Beloglazov, Y A, 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, A B, Gutz, E, Höffgen, S, Hoffmeister, P, Horn, I, Hössl, J, Jaegle, I, Junkersfeld, J, Kalinowsky, H, Klein, Frank, Klein, Fritz, Klempt, E, Konrad, M, Kopf, B, Krusche, B, Langheinrich, J, Löhner, H, Lopatin, I V, Lotz, J, Lugert, S, Menze, D, Messchendorp, J G, Mertens, T, Metag, V, Mosel, U, Nanova, M, Novotny, R, Ostrick, M, Pant, L M, H van Pee, Pfeiffer, M, Roy, A, Radkov, A, Schadmand, S, Schmidt, Ch, Schmieden, H, Schoch, B, Shende, S, Suft, G, Sumachev, V V, Szczepanek, T, Süle, A, Thoma, U, Varma, R, Walther, D, Weinheimer, Ch, Wendel, Ch
Format:	Artikel
Sprache:	eng
Schlagworte:	Atomic properties Matter & antimatter Momentum Nuclear cross sections Nuclear matter Omega-mesons Quarks Time dependence
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Zusammenfassung:	The photo production of $\omega$ mesons on the nuclei C, Ca, Nb and Pb has been measured using the Crystal Barrel/TAPS detector at the ELSA tagged photon facility in Bonn. The dependence of the $\omega$ meson cross section on the nuclear mass number has been compared with three different types of models, a Glauber analysis, a BUU analysis of the Giessen theory group and a calculation by the Valencia theory group. In all three cases, the inelastic $\omega$ width is found to be $130-150 \rm{MeV/c^2}$ at normal nuclear matter density for an average 3-momentum of 1.1 GeV/c. In the restframe of the $\omega$ meson, this inelastic $\omega$ width corresponds to a reduction of the $\omega$ lifetime by a factor $\approx 30$. For the first time, the momentum dependent $\omega$N cross section has been extracted from the experiment and is in the range of 70 mb.
ISSN:	2331-8422
DOI:	10.48550/arxiv.0802.0989

Zusammenfassung:	The photo production of \(\omega\) mesons on the nuclei C, Ca, Nb and Pb has been measured using the Crystal Barrel/TAPS detector at the ELSA tagged photon facility in Bonn. The dependence of the \(\omega\) meson cross section on the nuclear mass number has been compared with three different types of models, a Glauber analysis, a BUU analysis of the Giessen theory group and a calculation by the Valencia theory group. In all three cases, the inelastic \(\omega\) width is found to be \(130-150 \rm{MeV/c^2}\) at normal nuclear matter density for an average 3-momentum of 1.1 GeV/c. In the restframe of the \(\omega\) meson, this inelastic \(\omega\) width corresponds to a reduction of the \(\omega\) lifetime by a factor \(\approx 30\). For the first time, the momentum dependent \(\omega\)N cross section has been extracted from the experiment and is in the range of 70 mb.
ISSN:	2331-8422
DOI:	10.48550/arxiv.0802.0989

Modification of the \(\omega\)-Meson Lifetime in Nuclear Matter