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Medium effects in the production and π0γ{\pi^0 \gamma} decay of ω{\omega}-mesons in pA{pA} collisions in the GeV region

Abstract

The ω\omega resonance production and its π0γ\pi^0 \gamma decay in pApA reactions close to threshold is considered within the Intranuclear Cascade (INC) model. The π0γ\pi^0 \gamma invariant-mass distribution shows two components which correspond to the ω\omega decay "inside" and "outside" the nucleus, respectively. The "inside" component is distorted by medium effects, which introduce a mass shift as well as collisional broadening for the ω\omega-meson and its decaying pion. The relative contribution of the "inside" component is analyzed in detail for different kinematical conditions and nuclear targets. It is demonstrated that a measurement of the correlation in azimuthal angle between the π0\pi^0 and γ\gamma momenta allows to separate events related to the "inside" ω\omega decay from different sources of background when uncorrelated π0\pi^0's and γ\gamma's are produced

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EDP Sciences OAI-PMH repository (1.2.0)

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Last time updated on 10/04/2020

This paper was published in EDP Sciences OAI-PMH repository (1.2.0).

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