to Neutron Stars Mikhail Bashkanov Well known friends Meson Baryon 2 Prospective Newbies Tetra quark Penta quark Hexa quark 3 Multiquark vs Molecule Tetra quark Penta ID: 787091
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Slide1
hexaquark: from Photoproduction to Neutron Stars
Mikhail
Bashkanov
Slide2Well known friends
Meson
Baryon
2
Slide3Prospective Newbies
Tetra-
quark
Penta-
quark
Hexa-
quark
3
Slide4Multiquark vs Molecule
Tetra-
quark
Penta-
quark
Hexa-
quark
Meson-Baryon molecule
Baryon-Baryon molecule
Meson-Meson molecule
4
Slide5Six quark systems
B=2,
, Dibaryon
Baryon-baryon molecule
By baryon number:
By internal structure:
B=0,
,
Baryonium
Genuine
hexaquark
5
Slide6Dibaryonsprehistoric studies
Slide7Ancient historyDeuteron – “trivial dibaryon”
proton neutron
1931 Harold Urey,
Nobel prize 1934
Deuteron
phtotdisintegration
J. Chadwick, M.
Goldhaber
Nature 134, 237, (
1934
)
„
Disintegration of the Diplon by
-Rays
“The first search for the excited deuteron
7
Slide8Quark eraSix non-strange dibaryons
F. J. Dyson, N.-H.
Xuong
, Phys.
Rev
.
Lett. 13, 815 (1964).
I=0, J=3
I=3, J=0
I=1, J=2
I=0, J=1
8
I=1, J=0
I=2, J=1
Mirrored quantum numbers
Mass
NN threshold
N
threshold
threshold
Slide9Quark eraSix non-strange dibaryons
F. J. Dyson, N.-H.
Xuong
, Phys.
Rev
.
Lett. 13, 815 (1964).
p
n
p
n
2.2 MeV
66
keV
deuteron
NN-FSI
N
~10 MeV
D. Arndt
resonance
NN threshold
N
threshold
threshold
N
~10 MeV
PRL
121 (2018) 052001
~70 MeV
PLB
762
(2016)
455
I=0, J=3
I=3, J=0
I=1, J=2
I=2, J=1
I=0, J=1
I=1, J=0
9
Slide10Quark era
p
n
p
n
2.2 MeV
66
keV
deuteron
NN-FSI
N
~10 MeV
D. Arndt
resonance
NN threshold
N
threshold
threshold
N
~10 MeV
PRL
121 (2018) 052001
~70 MeV
PLB
762
(2016)
455
I=0, J=3
I=3, J=0
I=1, J=2
I=2, J=1
I=0, J=1
I=1, J=0
Loosely Bound/Unbound == Molecular
10
Slide11Quark era
p
n
p
n
2.2 MeV
66
keV
deuteron
NN-FSI
N
~10 MeV
D. Arndt
resonance
NN threshold
N
threshold
threshold
N
~10 MeV
PRL
121 (2018) 052001
~70 MeV
PLB
762
(2016)
455
I=0, J=3
I=3, J=0
I=1, J=2
I=2, J=1
I=0, J=1
I=1, J=0
Strongly Bound
Far from thresholds
potential
Hexaquark
11
Slide12size
size
Nearly complete overlap
Deuteron
Deltaron
12
Slide13Hexaquark/Dibaryon
13
Slide14Pathway to discovery
π
π
p
d
n
14
Slide15New peak to climb
d*(2380)
hexaquark
70 MeV
lifetime
P.
Adlarson
et. al Phys. Rev.
Lett
. 106:242302, 2011
NN*
background
background
15
Slide16d*(2380)
d*
d*
d*
Pathway to
discovery
16
Slide17decay branches
decay channel
Branching ratio, %
12(3)
14(1)
23(2)
30(5)
12(2)
6(1)
6(1)
0(10)
Branching ratio, %
12(3)
14(1)
23(2)
30(5)
12(2)
6(1)
6(1)
0(10)
Eur.Phys.J
. A51 (2015) 7, 87
energy dependence at
SAID
New SAID
solutions
p
n
n
p
P.
Adlarson
et al
. Phys. Rev.
Lett
.
112
, 202301, (2014
)
18
Slide19Argand plotP. Adlarson et al
. Phys. Rev. Lett. 112, 202301, (2014)P. Adlarson et al.
Phys. Rev. C
90
, 035204 , (2014)
19
Slide20EXPERIMENTAL VERIFICATION
20
Slide21Hexaquark Autopsy
d
p
p
p
n
3
1/2
1/2
electron
*
21
Slide22d*(2380) photoproduction
d
d
*
d
Conventional Background
M.
Egorov
, A. Fix,
Nucl.Phys
. A933 (2015)
104-113
B
.
Krusche
,
NStar
2019
T.
Ishikawa
et al.
Phys.Lett
. B772 (2017)
398
22
Slide23d d*(2380) transitionsDeuteron:
:
0.15%
5%
66%
2
%
30%
d*(2380)
deuteron
d
E2,
(
)
d
M3,
(
)
d
E4,
(
)
23
Slide24d d*(2380) transitionsDeuteron:
:
0.15%
5%
66%
2
%
30%
d*(2380)
deuteron
d
E2,
(
)
d
M3,
(
)
d
E4,
(
)
24
Slide25Photon beam
spin asymmetry
d
p
n
M3 transition seems to be preferable
E2
transition
likely to be small
M.
Bashkanov
et al., Phys
. Lett B789, (2019), 7-12
25
Slide26Is
compact?
Small E2 transition
compact
26
Slide27Is
compact?
Small E2 transition
compact
Not necessary
M.
Bashkanov
, D.P. Watts, A.
Pastore:
PRC
100
(2019) no.1, 012201
Pion cloud configurations in
Cancellation effects Electric Quadrupole moment is small Magnetic Octupole moment is large!!!
27
Slide28Experimentum crucis
28
Target
p
Polarimeter
p
Slide29Nucleon polarisation at
Conventional background, Kang et al
29
Slide30Nucleon polarisation at
Conventional background, Kang et al
30
Slide31Nucleon polarisation at
proton
H. Ikeda et al., Phys. Rev.
Lett
. 42, May 1979, 1321
Conventional background, Kang et al
31
Slide32Nucleon polarisation at
neutron
proton
M
.
Bashkanov
et al.,
to be published soon
32
Slide33Nuclear matter at high density
p
n
d
*
33
Slide34Hidden interior
I.
Vidaña
,
M.
Bashkanov
,
D.P.
Watts,
A. Pastore
Phys.Lett
. B781 (2018) 112-116
34
Slide35Hexaquarks in Neutron StarsI. Vidaña
, M. Bashkanov, D.P. Watts, A. PastorePhys.Lett
. B781 (2018) 112-116
Nuclear Matter
H
exaquark
Matter
35
Slide36Hexaquarks in Neutron StarsI. Vidaña
, M. Bashkanov, D.P. Watts, A. PastorePhys.Lett
. B781 (2018) 112-116
Nuclear Matter
H
exaquark
Matter
36
Submitted to
arXiv
: 28.06.2017
Slide37hexaquark
SU(3)
multiplet
*
*
J
p
=
3
+
37
Slide38ConclusionMany dibaryons, but only one hexaquark –
Mass, width, quantum numbers
All hadronic decays are identified
e-m probes
size and structure
in nuclear medium
production on nuclear targets
Neutron stars
EoS
NSNS, NSBH mergers
38
Slide39Exotic Hadron Spectroscopy Workshop
12—13, December 2019, York, UK
https://events.iop.org/exotic-hardon-spectroscopy-2019
Slide40Thank you
*
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+
*
*
*
+
*
*
*
+*
*
++
++
-
-
PLB
762
(2016)
455
Loosely bound or unbound
Phys.Rev.Lett
. 120 (2018) no.21,
212001
Bound by ~ 1 MeV, Lattice QCD (HAL-QCD)