Hexaquarks in hadro and photoinduced reactions Mikhail Bashkanov

Hexaquarks in hadro- and photoinduced reactions Mikhail Bashkanov

Quark systems Meson Tetraquark Baryon Pentaquark Hexaquark Octaquark? Meson-Meson-Baryon-Baryon molecule 2

Possible particles Tetraquark Meson-Meson molecule Hexaquark Baryon-Baryon molecule Pentaquark Meson-Baryon molecule Mikhail Bashkanov "Dibaryons" 3

Deuteron to Deltaron I(Jp) u = u I(Jp) = 0(3+) 0(1+) u d d d u u u d d d Threshold 2. 2 Me. V p n deuteron 80 Me. V Δ Δ d* 4

d*(2380) The Discovery 5

Total cross section pn d 0 0 “d* resonance” 70 Me. V NN*(1440) P. Adlarson et. al Phys. Rev. Lett. 106: 242302, 2011 6

Angular distribution in the peak J=3 J=1 P. Adlarson et. al Phys. Rev. Lett. 106: 242302, 2011 7

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 8

Argand plot P. Adlarson et al. Phys. Rev. Lett. 112, 202301, (2014) P. Adlarson et al. Phys. Rev. C 90, 035204 , (2014) 9

Branching ratio, % 12(3) 14(1) 23(2) 30(5) 12(2) 6(1) 0(10) Eur. Phys. J. A 51 (2015) 7, 87 10

I(Jp) = 0(3+) Δ 90 % Δ p 10 % n 11

Molecule vs Hexaquark 13

Deuteron L=0 p n 0. 9 fm 4 fm n p L=2 14

Deltaron: the width quest 16

Deltaron: the width quest 17

Deltaron: the with quest 18

Hidden color concept Hexaquark Deltaron M. Bashkanov, Stanley J. Brodsky, H. Clement Phys. Lett. B 727 (2013) 438 -442 F. Huang et al, Chin. Phys. C 39 (2015) 7, 071001 19

Deltaron vs Hexaquark L=0 Δ Δ 0. 9 fm 0. 7 fm 0. 9 fm F. Huang et al, Chin. Phys. C 39 (2015) 7, 071001 20

d* internal structure Experimental verification 21

Isospin filter pn dibaryon d 0 0 3 -body reaction pn dibaryon pn polarization observables PWA 2 -body reaction 22

M. Guenther Master Thesis, Basel 2015 Conventional Background M. Egorov, A. Fix, Nucl. Phys. A 933 (2015) 104 -113 24

Hexaquark vs molecule e - e- * d*(2380) d Transition form factor Charge distribution Internal structure 25

d Δ 26

eee- * * d*(2380) e * d*(2380) 27

Dibaryons a paradigm shift Mikhail Bashkanov "Dibaryons" 28

DLS puzzle Strong dilepton enhancement over hadronic coctails 29

pp pn M. Bashkanov, H. Clement Eur. Phys. J. A 50 (2014) 107 Data from G. Agakichiev et al. (HADES Collaboration), Phys. Lett. B 690 (2010) 118 30

The family of dibaryons 31

Mirror dibaryon d* I(Jp) = 0(3+) D u u I(Jp) = 3(0+) D u D d d d u u D u u Freeman J. Dyson, Nguyen-Hue Xuong Phys. Rev. Lett. 13(1964) 815 Avraham Gal, Humberto Garcilazo Nucl. Phys. A 928, (2014), 73 32

How many ways can you combine 6 q? Strangeness Isospin d* - - ++ ++ * * *+ * *

d* in Lattice 34

NN vs ΔΔ Z=+4 p n 66 ke. V Δ Δ Threshold ? 2. 2 Me. V p n deuteron 80 Me. V Δ Δ d* ”Search for an Isospin I =3 Dibaryon”ar. Xiv: 1606. 02964 35

How many ways can you combine 6 q? Strangeness Isospin d* - - ++ ++ * * *+ * *

Dibaryon Spectroscopy 37

Strange dibaryon 38

d*(2380) SU(3) multiplet Jp = 3+ * * 39

Strange Dibaryon Strangeness Isospin d* * * *+

Reaction p d n p p

Reaction

counts Search for the strange dibaryon

Search for d* in highenergy experiments 44

p n p p 45

p n p p 46

Conclusion �The very first dibaryon d*(2380) is established �Mass, Width, Quantum numbers, Main decay branches �Photo-induced reactions �Structure: Hexaquark vs Molecule? �Strange dibaryon �Support from theory �Further conformation from Particle Physics experiments? 48

Points for discussion: �Multiquarks vs molecules �Two-body decay vs many-body decays? �Branching ratios? �Fragmentation? �Internal structure �Diquarks? �Meson clouds? �Dynamical resonances? 49

d*(2380) internal structure 51

d*(2380) internal structure �pn d* d p n π Δ d Δ π 52

d*(2380) internal structure and the ABC effect L=0 Δ Δ L=2 M. Bashkanov et al, ar. Xiv: 1502. 07500 53

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 54

Theory 55

Dibaryon in Skyrme model David Foster, Nicholas S. Manton, Nucl. Phys. B 899 (2015) 513 56

d* in Lattice 57

d* in Lattice 58

59

Expectations p p n n SAID with resonance SAID A. Pricking, M. Bashkanov, H. Clement: ar. Xiv: 1310. 5532 60

p p n n SAID A. Pricking, M. Bashkanov, H. Clement: ar. Xiv: 1310. 5532 61

SAID p p n n New SAID solutions P. Adlarson et al. Phys. Rev. Lett. 112, 202301, (2014) 62

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) 63

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) 64

Effect of d* on other pn observables with d* without d* SP 07 R. L. Workman, W. J. Briscoe, I. I. Strakovsky Phys. Rev. C 93 (2016), 045201 65

Conventional background: • Known • Small A. Fix, H. Arenhoevel. Eur. Phys. J. A 25, 115, (2005). M. Egorov, A. Fix, Nucl. Phys. A 933 (2015) 104 -113 66

A. Fix, H. Arenhoevel. Eur. Phys. J. A 25, 115, (2005). M. Egorov, A. Fix, Nucl. Phys. A 933 (2015) 104 -113 67

Conventional background BUT Polarization observables Federico Ronchetti ar. Xiv 1301. 5886 68

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+) 69

Very Preliminary Results

Very Preliminary Results, sideband subtracted

The benchmark measurement Measure polarization of both proton and neutron ! d d* p n 72

New Particle identification detector 73

New Particle identification detector 74

Polarimeter 75

Experiment n Target Polarimeter 76

Experiment p p Target Polarimeter 77

Structure of the resonance. Transition form factor JLab 78

79

Mirror dibaryon d* I(Jp) = 0(3+) D u u I(Jp) = 3(0+) D u D d d d u u D u u Freeman J. Dyson, Nguyen-Hue Xuong Phys. Rev. Lett. 13(1964) 815 Avraham Gal, Humberto Garcilazo Nucl. Phys. A 928, (2014), 73 80

NN vs ΔΔ Z=+4 p n 66 ke. V Δ Δ Threshold ? 2. 2 Me. V p n deuteron 80 Me. V Δ Δ d* 81

How many ways can you combine 6 q? Strangeness Isospin d* - - ++ ++ * * *+ * *

Argand plots P. Adlarson et al. Phys. Rev. Lett. 112, 202301, (2014) P. Adlarson et al. Phys. Rev. C 90, 035204 , (2014) 83

N L=0, 2 N N L=2 L=0, 2, 4 N 84

d* (2380) pn N L=0, 2 L=2 n N p N L=2 10% L=0, 2, 4 90% p L=4 n N 85

d* (2380) pn N L=0, 2 p 90% n N p N L=2 10% N L=4 n L=0, 2, 4 L=2 86

Total cross section p. N d P. Adlarson et. al Phys. Lett. B 721 (2013) 229 87

pn pn 0 0 Conventional process +d* d* Conventional process P. Adlarson et al. , Phys. Lett. B 743 (2015) 325 -332 d* 88

Dibaryon non-fusion decays d* PRC 88 (2013) 055208 d* PLB 743 (2015) 325 HADES PLB 750 (2015) 184 89

The decay modes of the dibaryon Channel Publications d p 0 p 0 M. Bashkanov et. al Phys. Rev. Lett. 102 (2009) 052301 P. Adlarson et. al Phys. Rev. Lett. 106: 242302, 2011 P. Adlarson et. al Phys. Lett. B 721 (2013) 229 -236 d p+p- P. Adlarson et. al Phys. Lett. B 721 (2013) 229 -236 ppp 0 p- P. Adlarson et. al Phys. Rev. C 88, 055208 npp 0 p 0 P. Adlarson et. al Phys. Lett. B 743 (2015) 325 np A. Pricking, M. Bashkanov, H. Clement. ar. Xiv: 1310. 5532 pn e+e- M. Bashkanov, H. Clement, Eur. Phys. J. A 50 (2014) 107 3 He pp M. Bashkanov et. al Phys. Lett. B 637 (2006) 223 -228 P. Adlarson et. al Phys. Rev. C 91 (2015) 1, 015201 4 He pp P. Adlarson et. al Phys. Rev. C 86 (2012) 032201 P. Adlarson et al. Phys. Rev. Lett. 112, 202301, (2014) P. Adlarson et al. Phys. Rev. C 90, 035204 , (2014) + activities from other groups M. Bashkanov, Stanley J. Brodsky, H. Clement Phys. Lett. B 727 (2013) 438 -442 90

Branching ratio, % 12(3) 14(1) 23(2) 30(5) 12(2) 6(1) 0(10) Eur. Phys. J. A 51 (2015) 7, 87 91

Conventional background: • Known • Small A. Fix, H. Arenhoevel. Eur. Phys. J. A 25, 115, (2005). M. Egorov, A. Fix, Nucl. Phys. A 933 (2015) 104 -113 92

A. Fix, H. Arenhoevel. Eur. Phys. J. A 25, 115, (2005). M. Egorov, A. Fix, Nucl. Phys. A 933 (2015) 104 -113 93

Conventional background BUT Polarization observables Federico Ronchetti ar. Xiv 1301. 5886 94

Kinematics dp np + psp neu tron Proton spectator proton 95