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Mikhail Bashkanov

Wasa- at - COSY. Investigations of the Basic double- pionic fusion in the region of the ABC effect. Mikhail Bashkanov. Content. Double- pionic fusion The ABC-effect ABC Resonance in Quantum numbers Isospin decomposition , Resonance structure in the open channel

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Mikhail Bashkanov

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  1. Wasa-at-COSY Investigations of the Basic double-pionic fusion in the region of the ABC effect Mikhail Bashkanov

  2. Content • Double-pionic fusion • The ABC-effect • ABC Resonance in • Quantum numbers • Isospin decomposition • , • Resonance structure in the open channel • Resonance in elastic scattering

  3. Fusion n n p p g

  4. Double-pionic fusion g g n n p p p p g g

  5. Double-pionic fusion n n p p p p

  6. The ABC-effect n n p p p p

  7. 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)

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

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

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

  11. 1+ 3+ Quantum numbers of the structure pn  R 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. Δ π p d π n Δ Status ofTheoretical Description • pn  R DD  dp0p0 I(Jp) = 0(3+)

  13. Isospinrelations I=1 I=0

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

  15. M inpN d

  16. M inpN d

  17. M inpN d

  18. Open channel

  19. pn  pp-0 Conventional process +ABC  Conventional process Preliminary ABC “expected”

  20. Elastic channel

  21. 3+Resonance in pn p n L=2 p n L=4

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

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

  24. p p n n Expectations SAID with resonance SAID

  25. p p n n Expectation SAID with resonance SAID SAID with resonance

  26. p p n n Reality SAID with resonance SAID SAID with resonance

  27. pn Vector Analysing power Very Preliminary SAID with resonance SAID with resonance SAID

  28. Conclusion • ABC-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: , ,

  29. Thank you

  30. 1010=35282710 Multiplet Y()=2 I()=0  * *  Kim Maltman, Nucl. Phys. A501 (1989) 843

  31. 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

  32. 1010=35282710 Mirror Multiplet -- ++++  * **+* **+ **+* * 

  33. M inpN d

  34. M inpN d

  35. M inpN d

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