Dibaryon production and structure Mikhail Bashkanov Total cross

Dibaryon production and structure Mikhail Bashkanov

Total cross section pn d 0 0 “d* resonance” 70 Me. V NN*(1440) P. Adlarson et. al Phys. Rev. Lett. 106: 242302, 2011 2

u u u d d d Threshold I(Jp) = 0(3+) 80 Me. V d* Δ Δ 3

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

Branching ratio, % 12(3) 14(1) 23(2) 30(5) 12(2) 6(1) 0(<9) Eur. Phys. J. A 51 (2015) 7, 87 5

d* Internal Structure 6

d* internal structure Hexaquark Molecule Meson assisted Diquark dominated -dressed 7

Molecular Picture, A. Gal, P-wave p Phys. Lett. B 769 (2017) d* D-wave p Hidden color picture/hexaquark Yubing Dong, Fei Huang, Pengnian Shen, Zongye Zhang Phys. Lett. B 769 (2017) 223 T. Skorodko et al. ar. Xiv: 1702. 07212 8

Pure isovector (I=1) Mixed (I=1& I=0) Predominantly isovector Interested in isoscalar part only Proton beam Deuteron target 9

Systematical errors!!!! • Same beam • Same detector • Same deuteron target • Two protons in final state measured in the same kinematics 10

d*(2380) internal structure and the ABC effect L=0 Δ Δ L=2 M. Bashkanov et al, Nucl. Phys. A 958 (2017) 129 12

Deltaron: the with quest 13

Deltaron: the with quest see A. Gal, Phys. Lett. B 769 (2017) 436 for details 14

Deltaron vs Hexaquark 0. 7 fm Narrow width Branching ratios Dalitz plots L=0 Δ Δ L=2 F. Huang et al, Chin. Phys. C 39 (2015) 7, 071001 15

ee- * d*(2380) d Transition form factor Charge distribution Internal structure 16

d*(2380) in photoproduction? d* d p n d d* d Conventional Background M. Egorov, A. Fix, Nucl. Phys. A 933 (2015) 104 -113 M. Guenther, Hadron 2017 T. Ishikawa et al. Phys. Lett. B 772 (2017) 398 17

d p n H. Arenhoevel, M. Sanzone “Photodisintegration of the deuteron” 18

p N T. Watabe et al. hep-ph 9502244 R. Beck et al. (MAMI-A 2) Phys. Rev. C 61 (2000) 035204 Analysis of beam asymmetry 19

d p n 20

d p n 21

d*(2380) in photoproduction? R. Gilman and F. Gross nucl-th/0111015 (2001) d* d p n 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+) 22

The benchmark measurement Edinburgh polarimeter d* d p n Measure polarization of both proton and neutron ! Mikhail Bashkanov "Dibaryons" 23

Experiment p p Target Polarimeter 24

Recoil polarization at 90 degree proton Conventional background, Kang et al background+ d* H. Ikeda et al. , Phys. Rev. Lett. 42, May 1979, 1321 25

Recoil polarization at 90 degree neutron ry a in m ry e V i l e pr background+ d* proton Conventional background, Kang et al background+ d* H. Ikeda et al. , Phys. Rev. Lett. 42, May 1979, 1321 26

Recoil polarization at 90 degree neutron y r a in proton y r e V m i l e r p 27

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Nuclear matter at high density Mikhail Bashkanov "Dibaryons" 29

Neutron stars Eo. S I. Vidaña, M. Bashkanov, D. P. Watts, A. Pastore ar. Xiv: 1706. 09701 v 1 30

The d ∗ (2380) in neutron stars a new degree of freedom? I. Vidaña, M. Bashkanov, D. P. Watts, A. Pastore ar. Xiv: 1706. 09701 v 1 31

The d ∗ (2380) in neutron stars a new degree of freedom? I. Vidaña, M. Bashkanov, D. P. Watts, A. Pastore ar. Xiv: 1706. 09701 v 1 32

The d ∗ (2380) in neutron stars a new degree of freedom? I. Vidaña, M. Bashkanov, D. P. Watts, A. Pastore ar. Xiv: 1706. 09701 v 1 33

The d ∗ (2380) in neutron stars I. Vidaña, M. Bashkanov, D. P. Watts, A. Pastore ar. Xiv: 1706. 09701 v 1 GW 170817 from ar. Xiv: 1710. 05938 v 1 34

Trivial modifications: �Fermi smearing �Collision damping N N Δ N Δ Δ

Urca cooling Neutron stars mergers • Ejecta • HMNS->black hole • nucleosynthesis 37

Cold Baryonic Matter DLS puzzle Dibaryons as a probes of “cold hadronic soup” M. Bashkanov, H. Clement, Eur. Phys. J. A 50, 107, (2014) Mikhail Bashkanov "Dibaryons" 38

Exclusive measurements, Eur. Phys. J. A 53 (2017) no. 7, 149 39

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d*(2380) SU(3) multiplet Jp = 3+ * * 41

Conclusion � 42

The benchmark measurement Newly installed Edinburgh polarimeter d d* p n Measure polarization of both proton and neutron ! Mikhail Bashkanov "Dibaryons" 44

Phys. Rev. C 90 (2014) no. 6, 065809 45

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P-wave p d* D-wave p 49

SAID p p n n New SAID solutions P. Adlarson et al. Phys. Rev. Lett. 112, 202301, (2014) 50

Dimensionless partial wave amplitudes SP 14 Im SP 07 Re Resonance in the pn system P. Adlarson et al. Phys. Rev. Lett. 112, 202301, (2014) 51

Argand plot P. Adlarson et al. Phys. Rev. Lett. 112, 202301, (2014) P. Adlarson et al. Phys. Rev. C 90, 035204 , (2014) 52

Total pn cross-section Devlin et al, PRD 8, 136 (73) Lisowsk. I et al, PRL 49, 255(82) SAID SP 07 SAID new solution P. Adlarson et al. Phys. Rev. Lett. 112, 202301, (2014) P. Adlarson et al. Phys. Rev. C 90, 035204 , (2014) 53

NN vs ΔΔ I = 1, J =0 I = 3, J =0 Z=+4 p n 66 ke. V Δ Δ Threshold ? 2. 2 Me. V p n deuteron I = 0, J =1 80 Me. V Δ Δ d* I = 0, J =3 54

Z=+4 dibaryon isospin coefficients p p I

� � Double-Roper 56

Charge Z=+4 dibaryon upper limit 57

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