Ramos Gómez, ÀngelsTolós Rigueiro, LauraMolina, R.Oset Baguena, Eulogio2017-02-222017-02-222013-11-071434-6001https://hdl.handle.net/2445/107265We 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.16 p.application/pdfeng(c) Società Italiana di Fisica & Springer Verlag, 2013Mesons (Física nuclear)Estructura nuclearFísica nuclearMesons (Nuclear physics)Nuclear structureNuclear physicsinfo:eu-repo/semantics/article6301842017-02-22info:eu-repo/semantics/openAccess