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
Download The PPT/PDF document "hexaquark : from Photoproduction" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
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
Slide18energy 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
*
*
Slide41
**
+
*
*
*
+
*
*
*
+*
*
++
++
-
-
PLB
762
(2016)
455
Loosely bound or unbound
Phys.Rev.Lett
. 120 (2018) no.21,
212001
Bound by ~ 1 MeV, Lattice QCD (HAL-QCD)