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Two-pion production in Delta-Delta region – approaching the ABC puzzle

T.Skorodko, University Tuebingen for CELSIUS-WASA. Two-pion production in Delta-Delta region – approaching the ABC puzzle by exclusive and kinematically complete measurements. First step into the ABC.

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Two-pion production in Delta-Delta region – approaching the ABC puzzle

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  1. T.Skorodko, University Tuebingen for CELSIUS-WASA Two-pion production in Delta-Delta region – approaching the ABC puzzle by exclusive and kinematically complete measurements.

  2. First step into the ABC • Alexander Abashian, Norman E. Booth and Kenneth M. Crowe, Phys. Rev. Lett. 5, 258 (1960) π ABC 2 π Phase Space

  3. All of ABC ABC effect No ABC effect!

  4. ΔΔ Δ π Largeπ π invariant mass π N N Δ Δ π N N π Δ Smallπ π invariant mass

  5. π π π π π π π ABC and ΔΔ models

  6. pd3He ππ, Tp=895 MeV (I=0,1) (I=0) M.Bashkanov et. al, Phys. Lett. B637 (2006) 223-228

  7. ΔΔ versus N* decays pd3He ππ, Tp=895 MeV

  8. ΔΔ versus Reality

  9. D p D-D molecule p D 3He d Bound ΔΔ

  10. ΔΔ interaction Migdal-Watson ansatz

  11. ABC effect on 3He and d ΔΔ interaction data of O. Khakimova

  12. Total x-section for Celsius/Wasa Heidelberg – Tel-Aviv JINR unbound (ΔΔ)int bound (ΔΔ)int (24 MeV)

  13. pp  pppp : ABC effect ? DD interaction

  14. Conclusion • It is extremely important to make exclusive measurements: • ABC effect is one bump, not two! • ABC effect may be explained by ΔΔ molecule or by ΔΔinteraction. • Very strong attractive ΔΔ interaction. |as|13fm • tot  indications of ΔΔ bound state.

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