ABC effect as a signal of chiral symmetry restoration in hadronic collisionsстатья

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[1] Platonova M. N., Kukulin V. I. Abc effect as a signal of chiral symmetry restoration in hadronic collisions // Physical Review C - Nuclear Physics. — 2013. — Vol. 87, no. 2. — P. 025202–1–025202–5. A nonconventional mechanism for the basic 2π-fusion reaction pn → d + (ππ)0 in the energy region Tp = 1.0–1.4 GeV is suggested. The mechanism is aimed at providing a consistent explanation for the comprehensive experimental studies of this reaction in an exclusive setting done recently by theWASA-at-COSY Collaboration. The basic assumption of the model proposed is the production of the I (JP ) = 0(3+) dibaryon resonance D03 in the pn collision. The interference of two decay channels of this resonance—D03 → d + σ → d + (ππ)0 and D03 → D12 + π → d + (ππ)0—is shown to give a strong near-threshold enhancement in the ππ invariant mass spectrum, which is well known as the Abashian-Booth-Crowe (ABC) effect. The σ-meson parameters found to reproduce the ABC enhancement are in a general agreement with models which predict the chiral symmetry restoration at high excitation energy and/or high density of matter, although they are essentially less than those accepted for the free σ meson. So, this result might be considered as an indication of partial chiral symmetry restoration in dense and excited quark matter. [ DOI ]

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