→ ππ decay in nuclear medium ⋆
نویسندگان
چکیده
We calculate the width for the ω → ππ decay in nuclear medium. Chiral dynamics and low-density approximation are used. At densities around twice the nuclear saturation density we estimate the partial width for the decay of the longitudinal mode to be of the order of a few tens of MeV, and for the transverse mode a few times less.
منابع مشابه
ar X iv : n uc l - th / 0 10 30 27 v 2 9 M ay 2 00 1 ρ → ππ decay in nuclear medium ⋆
We calculate the medium modifications of the ρππ vertex in a relativistic hadronic framework incorporating nucleons and ∆(1232) isobars, and find a substantial increase of the ρππ coupling, dominated by processes where the ∆ is excited. The coupling depends significantly on the virtuality of the ρ, which is related to analytic properties of the vertex function. We analyze the general case of a ...
متن کاملM ar 2 00 1 ρ → ππ decay in nuclear medium ⋆
We calculate the medium modifications of the ρππ vertex in a relativistic hadronic framework incorporating nucleons and ∆(1232) isobars. We find a substantial increase of the ρππ coupling, dominated by processes where the ∆ is excited. The coupling depends significantly on the virtuality of the ρ, which is related to analytic properties of the vertex function. We analyze the general case of a n...
متن کاملPerspectives of Scalar- and Vector-meson Production in Hadron-nucleus Reactions
The production and decay of vector mesons (ρ, ω) in pA reactions at COSY energies is studied with particular emphasis on their in-medium spectral functions. It is explored within transport calculations, if hadronic in-medium decays like ππ or πγ might provide complementary information to their dilepton (ee) decays. Whereas the ππ signal from the ρ-meson is found to be strongly distorted by pion...
متن کاملChiral Symmetry and light resonances in hot and dense matter
We present a study of the ππ scattering amplitude in the σ and ρ channels at finite temperature and nuclear density within a chiral unitary framework. Meson resonances are dynamically generated in our approach, which allows us to analyze the behavior of their associated scattering poles when the system is driven towards chiral symmetry restoration. Medium effects are incorporated in three ways:...
متن کاملChiral nonperturbative approach to the isoscalar s - wave ππ interaction in a nuclear medium
Chiral nonperturbative approach to the isoscalar s-wave ππ interaction in a nuclear medium Abstract The s-wave isoscalar amplitude for ππ scattering in a nuclear medium is evaluated using a nonperturbative unitary coupled channels method and the standard chiral Lagrangians. The method has proved successful to describe the ππ properties in the scalar isoscalar channel up to 1.2 GeV giving rise t...
متن کامل