Mikhail Bashkanov Total cross section pn d 0

Mikhail Bashkanov

Total cross section pn d 0 0 d*(2380) dibaryon 70 Me. V 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

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d* internal structure Hexaquark Molecule Meson assisted Diquark dominated -dressed 6

Deuteron vs Deltaron 7

fluffy compact 80 Me. V d*(2380) 80 Me. V compact fluffy 8

fluffy compact 80 Me. V d*(2380) 80 Me. V compact fluffy 9

Nuclear matter at high density 10

Neutron stars Eo. S I. Vidaña, M. Bashkanov, D. P. Watts, A. Pastore Phys. Lett. B 781 (2018) 112 11

The d*(2380) in neutron stars a new degree of freedom? I. Vidaña, M. Bashkanov, D. P. Watts, A. Pastore Phys. Lett. B 781 (2018) 112 12

The d ∗ (2380) in neutron stars I. Vidaña, M. Bashkanov, D. P. Watts, A. Pastore Phys. Lett. B 781 (2018) 112 GW 170817 from ar. Xiv: 1710. 05938 v 1 13

From Nucleons to Quarks 14

Urca cooling Neutron stars mergers • Ejecta • HMNS->black hole • nucleosynthesis 15

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ee- * d*(2380) d Transition form factor Charge distribution Internal structure 17

d*(2380) electroproduction? d Δ 18

d*(2380) electroproduction? eee- * * d*(2380) e * d*(2380) 19

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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 21

deuteron to d*(2380) transitions 5% 0. 15% 66% 30% 2% 22

d p n 90% 10% H. Arenhoevel, M. Sanzone “Photodisintegration of the deuteron” 23

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 24

d p n 25

Magnetic M 3 transition might be sizable 26

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The benchmark measurement Edinburgh polarimeter d* d p n Measure polarization of both proton and neutron ! 28

Experiment p p Target Polarimeter 29

Recoil polarization at 90 degree neutron proton background+ d* Conventional background, Kang et al H. Ikeda et al. , Phys. Rev. Lett. 42, May 1979, 1321 30

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d*(2380) medium modifications? Trivial modifications: �Fermi smearing �Collision damping N N Δ N Δ Δ 32

d*(2380) medium modifications? N Δ Δ N N N 33

d*(2380) in-medium photoproduction �Small pn overlap �Small x-section �D-wave suppression d* d d d*+10 N 34

Conclusion • 35

Cold Baryonic Matter DLS puzzle Dibaryons as a probes of “cold hadronic soup” M. Bashkanov, H. Clement, Eur. Phys. J. A 50, 107, (2014) 37

Federico Ronchetti ar. Xiv 1301. 5886 38

p d n Magnetic M 3 transition might be sizable 39

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+) 40

Branching ratio, % 12(3) 14(1) 23(2) 30(5) 12(2) 6(1) 0(<9) Eur. Phys. J. A 51 (2015) 7, 87 41

Deltaron: the width quest 43

Deltaron: the width quest 44

Deltaron: the width quest 45

Deltaron: the width quest see A. Gal, Phys. Lett. B 769 (2017) 436 for details 46

A. Gal, Phys. Lett. B 769 (2017) 436 F. Huang et al, Chin. Phys. C 39 (2015) 7, 071001 47

Effective degrees of freedom Possible 6 q configuration 48

82% 18% 49

Pure isovector (I=1) Mixed (I=1& I=0) Predominantly isovector Interested in isoscalar part only Proton beam Deuteron target 50

Systematical errors!!!! • Same beam • Same detector • Same deuteron target • Two protons in final state measured in the same kinematics 51

d*(2380) internal structure and the ABC effect L=0 Δ Δ L=2 M. Bashkanov et al, Nucl. Phys. A 958 (2017) 129 53

Phys. Rev. C 90 (2014) no. 6, 065809 54

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Hyperon puzzle? � 56

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