Dibaryon Decays and Hexaquark Concepts

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Explore the fascinating world of dibaryon decays and hidden color concepts such as hexaquarks. Learn about the decay branches, resonance peaks, and internal structures through a series of intriguing studies. Discover more about the unique properties of these exotic particles.

  • Dibaryon
  • Hexaquark
  • Particle Physics
  • Decay Channels
  • Resonance Peaks
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  1. Mikhail Bashkanov

  2. Total cross section pn d00 d* resonance 70 MeV NN*(1440) P. Adlarson et. al Phys. Rev. Lett. 106:242302, 2011 2

  3. ?(2380) dibaryon ?? = ?? ??? ???= ??? ??? d d u d u u Threshold I(Jp) = 0(3+) 80 MeV d* ?? = ?.?? ??? ??? ?? ??? 3

  4. Dibaryon hadronic decays PLB 721 (2013) 229 PRL 106 (2011) 242302 WASA data ??0?0 ??+? pn d*(2380) ?? ??? ?0 ???+? PRL 112 (2014) 202301 PRC 90, (2014) 035204 ???0?0 d* PRC 88 (2013) 055208 PLB 743 (2015) 325 d* d* 4

  5. ?(2380) decay branches ? decay channel ?? ??0?0 ??+? ???+? ???0?0 ???0? ???0?+ ??? Branching ratio, % 12(3) 14(1) 23(2) 30(5) 12(2) 6(1) 6(1) 0(<9) Eur.Phys.J. A51 (2015) 7, 87 5

  6. 6

  7. ?(2380) - Deltaron? L=0 see A. Gal, Phys.Lett. B769 (2017) 436 for details 7

  8. Hidden color concept Hexaquark Deltaron M. Bashkanov, Stanley J. Brodsky, H. Clement Phys.Lett. B727 (2013) 438-442 F. Huang et al, Chin.Phys. C39 (2015) 7, 071001 8

  9. Deltaron vs Hexaquark 33% L=0 0.7 fm 66% 0.9 fm 0.9 fm F. Huang et al, Chin.Phys. C39 (2015) 7, 071001 9

  10. Deltaron vs Hexaquark 0.7 fm ? 33% 66% Narrow width L=0 Branching ratios Dalitz plots L=2 10% 90% ???, see Nucl.Phys. A958 (2017) 129-146 F. Huang et al, Chin.Phys. C39 (2015) 7, 071001 10

  11. d* internal structure Hexaquark Molecule Diquark dominated -dressed Meson assisted 11

  12. ? ??? decay Molecular Picture, A. Gal, Phys.Lett. B769 (2017) D. Arndt ? state has sizable ?? decay branch: ? ??? should be seen Hidden color picture/hexaquark Yubing Dong, Fei Huang, Pengnian Shen, Zongye Zhang Phys.Lett. B769 (2017) 223 ? ??? decay is tiny 12

  13. ? ??? decay in experiment ?? ???+ ?? ???0 Pure isovector (I=1) Mixed (I=1& I=0) Predominantly isovector ?? ??? ?? ???0 Interested in isoscalar part only ??? ???? = 0 = 3(2??? ??? ??? ???0) ?? ??? + pspectator ?? ???0+ nspectator Proton beam Deuteron target 13

  14. ? ??? decay in experiment ?? ??? isoscalar cross section ??? ???? = 0 = 3(2??? ??? ??? ???0) Wasa-at-Cosy arXiv:1702.07212 arXiv:1702.07212 Systematical errors!!!! Same beam Same detector Same deuteron target Two protons in final state measured in the same kinematics Br(? ???)<9% - upper limit Likely to be close to 0 14

  15. Nuclear matter at high density p d* n Mikhail Bashkanov "Dibaryons" 15

  16. The d (2380) in neutron stars - a new degree of freedom? I. Vida a, M. Bashkanov, D.P. Watts, A. Pastore arXiv:1706.09701v1 16

  17. ?size e- e- d*(2380) Transition form factor Charge distribution Internal structure 17

  18. d*(2380) in photoproduction? d* d* ?? ??0?0 ?? ??0?0 Conventional Background M. Egorov, A. Fix, Nucl.Phys. A933 (2015) 104-113 ? M. Guenther Master Thesis, Basel 2015 T. Ishikawa et al. Phys.Lett. B772 (2017) 398 18

  19. The benchmark measurement Newly installed Edinburgh polarimeter d* Measure polarization of both proton and neutron ! Mikhail Bashkanov "Dibaryons" 19

  20. Deuteron photodisintegration: beam asymmetry ~ ?=2????2(??? ) PRC 26 (1982) 2358 20

  21. Deuteron photodisintegration: beam asymmetry ~ ?=2????2(??? ) PRC 26 (1982) 2358 ? should be noticeable in?6 H. Ikeda et al.Nucl. Phys. B 172 (1980) 509 2 21

  22. Conclusion The very first dibaryon d*(2380) is established Mass, Width, Quantum numbers Main decay branches Structure: Hexaquark vs Molecule? Medium Modifications? Neutron Stars? 22

  23. ?(2380) * *

  24. d*(2380) in photoproduction? R. Gilman and F. Gross nucl-th/0111015 (2001) d* T. Kamae, T. Fujita Phys. Rev. Lett. 38, Feb 1977, 471 H. Ikeda et al., Phys. Rev. Lett. 42, May 1979, 1321 I(Jp) = 0(3+) ? = ?.?? ??? 24

  25. d*(2380) SU(3) multiplet Jp = 3+ ? (2380) ?? ? + ? < ??? ? + ? * ?? (2.53 2.60) * (2.68 2.76) ??? (2.82 2.90) ???? 25

  26. Deltaron: the width quest (1232) width 26

  27. Deltaron: the with quest 2 (1232) width 27

  28. Deltaron: the with quest 2 ?? 2 2 M = ? The mass of the bound in the Deltaron M =?? 2 q = 0 only if the size of the Deltaron is momentum in the Deltaron only if q = 0 For R? = 0.9??, ? = 2 = 70 ??? see A. Gal, Phys.Lett. B769 (2017) 436 for details 28

  29. ?? ??? isoscalar cross section ??? ???? = 0 = 3(2??? ??? ??? ???0) pp ???0 np ??? Complete cancellation of resonance in isoscalar case 29

  30. Beam asymmetry M1 transition (?+) or E2 transition (?+) E2/M1 ratio for the ?? T. Watabe et al. hep-ph 9502244 ?2 ?1=1 ??? ? ?? 2??? R. Beck et al. (MAMI-A2) Phys.Rev. C61 (2000) 035204 Analysis of beam asymmetry ?2 ?1= 2.5% 30

  31. ? and beam asymmetry E2 transition (?+) M3 transition (?+) E4 transition (?+) H. Arenhoevel, M. Sanzone Photodisintegration of the deuteron 31

  32. Experiment ? p ? ,?,? p Target ? ,? ?? ?? Polarimeter 32

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