Few-Body Systems

, Volume 55, Issue 8–10, pp 791–794 | Cite as

New Interpretation of the ABC Effect in Two-Pion Production in NN Collisions

Article

Abstract

We investigate the basic 2π-fusion reaction pnd + (ππ)0 in the energy region Tp = 1–1.4GeV within the framework of a model based on a D03-dibaryon production and its subsequent decay via two interfering routes: through an intermediate σ meson and through an isovector dibaryon D12. We demonstrate that the constructive interference of the above two mechanisms gives a strong near-threshold enhancement in the ππ invariant-mass spectrum, i.e., the so-called ABC effect. It is shown that the σ-meson emission from the D03 dibaryon plays a crucial role in reproducing the shape and position of the ABC enhancement and is tightly related to the idea of chiral symmetry restoration in dense and excited hadronic systems, such as the D03 state.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Abashian A., Booth N.E., Crowe K.M.: Possible anomaly in meson production in p + d collisions. Phys. Rev. Lett. 5, 258–260 (1960)ADSCrossRefGoogle Scholar
  2. 2.
    Adlarson, P., et al.: Abashian-Booth-Crowe effect in basic double-pionic fusion: a new resonance? Phys. Rev. Lett. 106, 242302-1–242302-4 (2011)Google Scholar
  3. 3.
    Adlarson P. et al.: Isospin decomposition of the basic double-pionic fusion in the region of the ABC effect. Phys. Lett. B 721, 229–236 (2013)ADSCrossRefGoogle Scholar
  4. 4.
    Dyson F.J., Xuong N.-H.: Y = 2 states in SU(6) theory. Phys. Rev. Lett. 13, 815–817 (1964)ADSCrossRefGoogle Scholar
  5. 5.
    Platonova, M.N., Kukulin, V.I.: ABC effect as a signal of chiral symmetry restoration in hadronic collisions. Phys. Rev. C 87, 025202-1–025202-5 (2013)Google Scholar
  6. 6.
    Arndt R.A., Strakovsky I.I., Workman R.L., Bugg D.V.: Analysis of the reaction π + dpp to 500 MeV. Phys. Rev. C 48, 1926–1938 (1993)ADSCrossRefGoogle Scholar
  7. 7.
    Gal A., Garcilazo H.: Three-body calculation of the ΔΔ dibaryon candidate D 03(2370). Phys. Rev. Lett. 111, 172301-1–172301-5 (2013)ADSCrossRefGoogle Scholar
  8. 8.
    Kukulin V.I., Obukhovsky I.T., Pomerantsev V.N., Faessler A.: Two-component dressed-bag model for NN interaction: deuteron structure and phase shifts up to 1 GeV. Int. J. Mod. Phys. E 11, 1–33 (2002)ADSCrossRefGoogle Scholar
  9. 9.
    Caprini I., Colangelo G., Leutwyler H.: Mass and width of the lowest resonance in QCD. Phys. Rev. Lett. 96, 132001-1–132001-4 (2006)ADSCrossRefGoogle Scholar
  10. 10.
    Hatsuda T., Kunihiro T., Shimizu H.: Precursor of chiral symmetry restoration in the nuclear medium. Phys. Rev. Lett. 82, 2840–2843 (1999)ADSCrossRefGoogle Scholar
  11. 11.
    Glozman L.Ya.: Parity doublets and chiral symmetry restoration in baryon spectrum. Phys. Lett. B 475, 329–334 (2000)ADSCrossRefGoogle Scholar

Copyright information

© Springer-Verlag Wien 2013

Authors and Affiliations

  1. 1.Skobeltsyn Institute of Nuclear PhysicsLomonosov Moscow State UniversityMoscowRussia

Personalised recommendations