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Mikhail Bashkanov

Wasa- at - COSY. Encounters with Di-Baryons from the ABC-effect to a Resonance in the Proton-Neutron System. Mikhail Bashkanov. Content. Introduction – the ABC effect ABC resonance in Quantum numbers Isospin decomposition , Resonance in elastic scattering . Double- pionic fusion.

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Mikhail Bashkanov

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  1. Wasa-at-COSY Encounters with Di-Baryons from the ABC-effect to a Resonance in the Proton-Neutron System Mikhail Bashkanov

  2. Content • Introduction – the ABC effect • ABC resonance in • Quantum numbers • Isospin decomposition • , • Resonance in elastic scattering

  3. Double-pionic fusion n n p p p p

  4. The ABC-effect n n p p p p

  5. History of the ABC effect Low mass enhancement in M P. Adlarsonet. al, Phys. Rev. Lett. 106 (2011) 242302 M.Bashkanovet. al, Phys. Lett. B637 (2006) 223-228 P. Adlarsonet. al, Phys. Rev. C86(2012) 032201 • Alexander Abashian, Norman E. Booth Kenneth M. Crowe, Phys. Rev. Lett. 5, 258 (1960)

  6. Two-pion production “s” N* D(1600) N* D D D D Tp< 1.5 GeV

  7. Isospin Decomposition N*(1440) DD D(1600) T. Skorodko et al., PLB 679 (2009) 30

  8. Expectations in total cross section

  9. Total cross section pn d00 “ABC resonance” 70 MeV  NN*(1440) P. Adlarson et. al Phys. Rev. Lett. 106:242302, 2011

  10. Angular distribution in the peak J=3 J=1

  11. 1+ 3+ Quantum numbers of the structure pn d*  ∆∆d 00 Antisymmetrization: Jp=1+or 3+ : if LΔΔ=0 1+ excluded by ().3+ assigned pn  d 00 I=0 I=0,1 I=0 I=0,2

  12. M for different energies t-channel  “ABC effect”

  13. Δ π p d π n Δ Status ofTheoretical Description • pn  R DD  dp0p0 I(Jp) = 0(3+)

  14. Isospinrelations I=1 I=0

  15. Total cross section pN d P. Adlarson et. al Phys. Lett. B721 (2013) 229

  16. M inpN d

  17. M inpN d

  18. M inpN d

  19. Isospin violation 00 +-

  20. Non-fusion channel

  21. pn  pp-0 Conventional process +ABC  Conventional process Preliminary ABC “expected” P. Adlarson et al., arXiv: 1306.5130v1

  22. Elastic channel

  23. 3+Resonance in np p n L=2 p n L=4

  24. Total pncross-section Devlin et al, PRD8, 136 (73) LisowskI et al, PRL49, 255(82) SAID SAID + resonance

  25. p p n n Expectations SAID with resonance SAID

  26. p p n n Expectation SAID with resonance SAID SAID with resonance

  27. p p n n Reality SAID with resonance SAID SAID with resonance

  28. pn Vector AnalysingPower Very Preliminary SAID with resonance SAID SAID with resonance

  29. Conclusion • d*-resonance is seen in • pn-elastic scattering exhibits fast phase motion • Good hints for a resonance in elastic channel • A discovery of a new resonance? • Dibaryon: , ,

  30. Thank you

  31. 1010=35282710 Multiplet Y()=2 I()=0  * *  Kim Maltman, Nucl. Phys. A501 (1989) 843

  32. Mirror dibaryon d* I(Jp) = 0(3+) I(Jp) = 3(0+) D D D D d d u u d u u u u u u u

  33. 1010=35282710 Mirror Multiplet -- ++++  * **+* **+ **+* * 

  34. Beam polarization Polarization 2 0 Polarization 1 2

  35. Total cross section pp d+0 Shimizu et al. F. Kren et al.

  36. Total cross section pn d00

  37. Total cross section pn d+-

  38. Total cross section pn d+-

  39. dpnp + psp Kinematics neutron Proton spectator proton

  40. Status ofthe ABC Resonance decaychannelbranchingstatus ------------------------------------------------------------------------ d p0p015 % observed d p+p-25 % observed ppp0p-7 % observed npp0p0(12 %, predicted*) dataanalysis WASA npp+p-(31 %, predicted*) dataanalysis HADES np(10 %, predicted) dataanalysis WASA * Fäldt & Wilkin, PLB 701 (2011) 619 Albaladejo & Oset, arXiv:1304.7698 [nucl-theor]

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