The width of the omega meson in the nuclear medium
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The width of the omega meson in the nuclear medium

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The width of the omega meson in the nuclear medium

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Ramos Gómez, Àngels; Tolós Rigueiro, Laura; Molina Peralta, Raquel; Oset Báguena, Eulogio Perfil
Aquest document és un/a article, creat/da en: 2013

Este documento está disponible también en : http://dx.doi.org/10.1140/epja/i2013-13148-x
We evaluate the width of the omega meson in nuclear matter. We consider the free decay mode of the omega into three pions, which is dominated by rho IEuro decay, and replace the rho and pi 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 mechanism with medium-modified K , propagators. We obtain a substantial increase of the omega width in the medium, reaching a value of 121 +/- 10 MeV at normal nuclear matter density for an omega at rest, which comes mainly from omega N -> pi pi N, omega NN -> pi NN processes associated to the dominant omega -> rho IEuro decay mode. The value of the width increases moderately with momentum, reaching values of around 200MeV at 600MeV/c.

    Ramos, A. Tolos, L. Molina, R. Oset Báguena, Eulogio 2013 The width of the omega meson in the nuclear medium European Physical Journal A 49 11 148
http://dx.doi.org/10.1140/epja/i2013-13148-x
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