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DOUBLE-PION PRODUCTION IN NUCLEON COLLISIONS ON FEW-BODY SYSTEMS — THE ABC EFFECT AND ITS POSSIBLE ORIGIN

FOR THE CELSIUS/WASA AND WASA-AT-COSY COLLABORATIONS

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MIKHAIL BASHKANOV

Physikalisches Institut, Universität Tübingen, D-72076 Tübingen, Germany

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https://doi.org/10.1142/S0217751X09043559Cited by:0 (Source: Crossref)

Abstract

The ABC effect – an intriguing low-mass enhancement in the ππ invariant mass spectrum – is known from inclusive measurements of two-pion production in nuclear fusion reactions. Exclusive measurements have been carried out at CELSIUS/WASA and WASA@COSY for the fusion reactions leading to d, ³He and ⁴He. They all reveal this effect to be a σ channel phenomenon combined with a resonance-like behavior in the total cross section. The latter points to the formation of an isoscalar dibaryonic resonance, which couples to the pn channel as well as to a ΔΔ intermediate state.

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DOUBLE-PION PRODUCTION IN NUCLEON COLLISIONS ON FEW-BODY SYSTEMS — THE ABC EFFECT AND ITS POSSIBLE ORIGIN

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