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Title: | The width of the omega meson in the nuclear medium |
Author: | Ramos Gómez, Àngels Tolós Rigueiro, Laura Molina, R. Oset Baguena, Eulogio |
Keywords: | Mesons (Física nuclear) Estructura nuclear Física nuclear Mesons (Nuclear physics) Nuclear structure Nuclear physics |
Issue Date: | 7-Nov-2013 |
Publisher: | Società Italiana di Fisica & Springer Verlag |
Abstract: | We evaluate the width of the ω meson in nuclear matter. We consider the free decay mode of the ω into three pions, which is dominated by ρπ decay, and replace the ρ and π propagators by their medium-modified ones. We also take into account the quasielastic and inelastic processes induced by a vector-baryon interaction dominated by vector meson exchange, as well as the contributions coming from the ω→KK¯ mechanism with medium-modified K , K¯ propagators. We obtain a substantial increase of the ω width in the medium, reaching a value of 121 ± 10 MeV at normal nuclear matter density for an ω at rest, which comes mainly from ωN → ππN, ωNN → πNN processes associated to the dominant ω → ρπ decay mode. The value of the width increases moderately with momentum, reaching values of around 200MeV at 600MeV/c. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1140/epja/i2013-13148-x |
It is part of: | European Physical Journal A, 2013, vol. 49, p. 148 |
URI: | http://hdl.handle.net/2445/107265 |
Related resource: | https://doi.org/10.1140/epja/i2013-13148-x |
ISSN: | 1434-6001 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) Publicacions de projectes de recerca finançats per la UE |
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