1 / 40

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.

cody
Download Presentation

Mikhail Bashkanov

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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]

More Related