The%20meson%20landscape

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Diquarks, Tetraquarks, and no quarks
(but no pentaquarks)
Diquarks,Tetraquarks, Pentaquarks
and no quarks
The meson landscape
Scalars and Glue in Strong QCD
New states beyond
Weird baryons pentaquark problems
Exotics what needs to be measured
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Why do we need to teach science?
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Physics Problem How to get the car out of
the water?
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Use a tow truck!
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A closer look to check its all OK?
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Physics Problem Part 2 How to get the tow
truck out of the water?
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.. use a bigger tow truck
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Physics Problem Part 3 How to get
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3
2
out of the water.
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Ask a physicist
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• IDEAS
• 1. Quarks, Chromostatics and Glueballs
• 2. Strong QCD, flux tubes and hybrids
• PHENOMENOLOGY
• 3. Scalar glueball whats the evidence?
• 4. Hybrids and Tetraquarks
• 5. Hybrid charmonium??

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• But first
• A taster of the current charmonium puzzle

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???
ee- to X
Belle
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ee- \to psi pi pi BaBar sees new vector cc
Y(4260)
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Y(4260) Three Possibilities
Y(4260) Non resonant S-wave threshold
Experimental distinctions.later
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1.HOW QUARKS BEHAVE

• CHROMOSTATICS
• and glueballs

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Quarks carry any of three colour charges



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Antiquarks carry any of three colour charges
but negative
_
_
_
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Now use familiar rules Like charges (colours)
repel opposite (colours) attract
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Now use familiar rules Like charges (colours)
repel opposite (colours) attract
_

Makes a meson.
Simplest chromostatic analogue of
electrostatic positronium
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The THREE colours enable quarks to
attract one another making BARYONS (e.g. the
proton)
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baryon
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A diquark
-
-
Can attract an anti-diquark
Making a meson that is a tetraquark
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How can we tell if its this
-
-

Or this?
-
(later)
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Quantum Electrodynamics QED
Electric charge Atoms Molecules
Interaction of electric charges and photons
Quantum Chromodynamics QCD
Colour charge Baryons Nucleus
Interaction of colour charges and gluons
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q
Gluon br
Gluon is coloured Carries the charge
q
Like QED as far as pert theory concerned Strong
at long range/low energy Need lattice QCD and
models based on this
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Gluon bg
Gluon bg
Colour singlet glueball (Strong QCD more
complicted than this OgE example)
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what can be said about glueballs?
Glueballs spectrum from Lattice
Far away from qq lowest multiplets except for
0
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2.Strong QCD

• FLUX TUBES and HYBRIDS

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QCD inspired potential for heavy QQ
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Quarkonium template qq L S ( 0,1) J
1D1- 2- 3- 2-
2S 1- 0-
1P0 1 2 1
1S 1- 0-
L1
L2
L0
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Quarkonium template Scalar qq is canonical
1D 1-
2S 1-
2
1
0
1S 1-
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(cc)
3772

1D 1-
10023
3686
2S 1-
3556
9913
2
9893
3510
1
9860
3415
0
9460
3097
1S 1-
Narrow below MM threshold
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(cc)
3772

1D 1-
10023
3686
2S 1-
3556
9913
2
9893
3510
1
9860
3415
0
9460
3097
1S 1-
Lattice QCD Linear Flux tube..implies
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flux-tube degrees-of-freedom
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flux-tube degrees-of-freedom
Costs about 1 to 1.5GeV energy to excite
phonon pi/R Hybrid nn _at_ 2GeV Hybrid cc _at_
4-4.5GeV
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Gluonic hybrid mesons
Exciting the flux tube
2006Lattice QCD seems to confirm flux tube model
predictions !
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Lattice 1.8-2.2 1- signals resonant?
hybrid or molecule? E1 photoproduction of
hybrids gamma p to n H \sim 50 relative to
conventional mesons (Isgur FC Dudek) 2- also
expected. Diffractive Photoproduction!! Should
exceed 1- strength
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Lattice 1.8-2.2 2- also expected.
Diffractive Photoproduction!! Should exceed 1-
strength
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flux-tube degrees-of-freedom
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flux-tube breaking and decays
Break tube SP states yes SS suppressed 1-
\to pi b_1pi f_1 41 and big FC Page95
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flux-tube breaking and decays
Break tube SP states yes SS suppressed 1-
\to pi b_1pi f_1 41 and big FC Page95 QCD
Lattice 06 MichaelMcNeile confirm this
!! S-wave decay amplitude at threshold agree flux
tube prediction Beware naïve comparison of
widths Implies FT model estimates somehow mimic
strong QCD
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(cc)
3772

1D 1-
10023
3686
2S 1-
3556
9913
2
9893
3510
1
9860
3415
0
9460
3097
1S 1-
Narrow below MM threshold
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(cc)
3772

1D 1-
10023
3686
2S 1-
3556
9913
2
Either no G with these JPC in this region (0-
2.5lteta_c) (1 3.8Gev psiprime?) or dont
couple strongly to G
9893
3510
1
9860
3415
0
9460
3097
1S 1-
Narrow below MM threshold
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Glueballs spectrum from Lattice
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Glueballs also predicted Strong QCD spectrum
from Lattice





Only scalar glueball below 2 GeV
Far away from qq lowest multiplets except for
0
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I1 vector I0 nn ss
Problem of nn ss flavour mixing
1700
1D 1-
1460
2S 1-
1320 1270/1525
2
1300 1285/1530
1
0
770 780/1020
1S 1-
Clean below S-wave MM thresholds And no prominent
G expected
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I1 vector I0 nn ss
Problem of nn ss flavour mixing
1700
1D 1-
1460
2S 1-
1320 1270/1525
2
1300 1285/1530
1
1420 1370/1500/1710
0
770 780/1020
1S 1-
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I1 vector I0 JP 2 1 0
1700
1D 1-
1460
2S 1-
13201270/1525
2
13001285/1530
1


1420 1370/1500/1710
0
980 980/600
770
1S 1-
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I1 vector I0 JP 2 1 0
1700
1D 1-
1460
2S 1-
13201270/1525
2
13001285/1530
1


1420 1370/1500/1710
0
qqqq
980 980/600
770
1S 1-
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I1 vector I0 JP 2 1 0
1700
1D 1-
1460
2S 1-
1270/1525
2
? qq Glueball
1285/1530
Lattice G 1.6 \pm
1
0 1370/1500/1710
0
980/600
770
1S 1-
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I1 vector I0 JP 2 1 0
1700
1D 1-
1460
2S 1-
1270/1525
2
? qq Glueball
1285/1530
Lattice G 1.6 \pm
1
Data do not imply G But given lattice and
qq Does consistent pic emerge?
0 1370/1500/1710
0
980/600
770
1S 1-
Can data eliminate it or even make it robust?
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3.Scalar Glueball

• WHATS the EVIDENCE?

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Glueballs also predicted Strong QCD spectrum
from Lattice





Only scalar glueball below 2 GeV
Far away from qq lowest multiplets except for
0
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I1 vector I0 nn ss
Problem of nn ss flavour mixing
1700
1D 1-
1460
2S 1-
1320 1270/1525
2
1300 1285/1530
1
1420 1370/1500/1710
0
770 780/1020
1S 1-
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Scalar Glueball and Mixing
s
G
n
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Scalar Glueball and Mixing

• Meson
• 1710
• 1500
• 1370

s
G
n
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Scalar Glueball and Mixing

• Meson G ss nn
• 1710 0.39 0.91 0.15
• 1500 - 0.65 0.33 - 0.70
• 1370 0.69 - 0.15 - 0.70

s
G
n
LEAR/WA102 Meson pair decays
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Scalar Glueball and Mixinga simple example for
expt to rule out

• Meson G ss nn
• 1710 0.39 0.91 0.15
• 1500 - 0.65 0.33 - 0.70
• 1370 - 0.69 0.15 0.70

0- 0- meson decays LEAR/ WA102 FC Kirk
s
n
l
Nontrivial correlation with relative masses
middle
light
heavy
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Scalar Glueball and Mixinghow to measure
flavour state

• Meson G ss nn
• 1710 0.39 0.91 0.15
• 1500 - 0.65 0.33 - 0.70
• 1370 0.69 - 0.15 - 0.70

s
n
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Scalar Glueball and Mixing

• Meson G ss nn
• 1710 0.39 0.91 0.15
• 1500 - 0.65 0.33 - 0.70
• 1370 0.69 - 0.15 - 0.70

s
n
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Coming soon from BES and CLEO-c
gt1 billion
1000 per meson
A flavour filter for 0 0- 2 mesons and
glueballs
Challenge Turn Lattice QCD Glueball spectrum
into physics
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Glueballs and central production
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Glueballs and central production
High energy pomeron glue(balls)
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Glueballs and central production
G
Idea Robson, FC 77
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Glueballs and central production
G
qq
Reality qq (also) produced
How to separate G and qq? FC Kirk Schuler 97-00
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Two configurations for same t1,t2 c.m picture
1
G/qq
p_T(1)-p_T(2) big
2
2
p_T(1)-p_T(2) small
1
G
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Two configurations for same t1,t2 lab picture
1beam
p_T(1)-p_T(2) big
2 target
2target
1beam
p_T(1)-p_T(2) small
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Two configurations for same t1,t2 lab picture
1beam
They are related by..
2 target
2target
1beam
Phi rotation
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Rich JPC dependence
0-
1- -
1
2-
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Rich JPC dependence
0
2
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0-Eta(960) phi and t distributions gg
fusion or any vector vector sin2(phi)
and vanish as t \to 0
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Also explains Eta_2(1645) phi and t
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And changing behaviour of 1 f1(1285)
All t
t1-t2gt0.4
t1-t2lt0.2
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So 0- 1 2- qq explained

• Pomeron transforms like vector
• gluon gluon fusion? (details suggest more
  complicated)
• 0- 1 2- are explained
• but for

0 and 2 something weird is happening
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Central Production pp \to pMp 0 and 2
qq
G ?
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