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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:
It is part of: European Physical Journal A, 2013, vol. 49, p. 148
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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