the meson landscape
DESCRIPTION
Strong. “Diquarks,Tetraquarks, Pentaquarks and no quarks”. The meson landscape. Q. C. D. Scalars and Glue in Strong QCD. New states beyond. Weird baryons: pentaquark problems. Theory to Reality via Lattice&Jlab. 1. - PowerPoint PPT PresentationTRANSCRIPT
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The meson landscape
Scalars and Glue in Strong QCD
New states beyond
Weird baryons: pentaquark problems
“Diquarks,Tetraquarks, Pentaquarks and no quarks”
1
Theory to Reality via Lattice&Jlab
Strong
Q C D
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Only discuss hadrons that are either
Agreed to experimentally exist
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Only discuss hadrons that are either
Agreed to experimentally existAgreed experimentally to exist
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Only discuss hadrons that are either
Agreed to experimentally existAgreed experimentally to exist
or
Agreed theoretically should exist
Life is hard enough anyway and theorists are easily led astray
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ArndtBuccellaCarlsonDyakanovEllisFaberGianniniHuangInoueJaffeKarlinerLipkinMaltmanNussinovOhPolyakovQiangRosnerStechTrillingUVenezianoWilczekXiangYangZhu
If Theta pentaquark doesn’t exist,then these (and many other theorists)should be congratulated on their creativity
Pentaquark
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Somethings are deceptively simple
m(Bc) = 6276.5 (4.0) (2.7)
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Somethings are deceptively simple
m(Bc) = 6276.5 (4.0) (2.7)
m(c)+m(b) ~ ½[m(psi) + m(upsilon)] = 6278.6
Heavy mass scale of c and b make agreements look artificially good
better than 1 per mille !
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Somethings are deceptively simple
m(Bc) = 6276.5 (4.0) (2.7)
m(c)+m(b) ~ ½[m(psi) + m(upsilon)] = 6278.6
Heavy mass scale of c and b make agreements look artificially good
better than 1 per mille !
WHY does it work so well? Constituent d.o.f.robust=gift of nature
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2S: 1-
1S: 1-
1D: 1-
2+
1+
0+
9460
10023
9860
9893
9913
3686
3097
3415
3510
3556
3772
cc*)
Narrow below MM threshold
Anothergift of nature
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2S: 1-
1S: 1-
1D: 1-
2+
1+
0+
9460
10023
9860
9893
9913
3686
3097
3415
3510
3556
3772
cc*)
Lattice QCD: Linear: Flux tube…..implies…
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Gluonic hybrid mesons
c.m
.c.m
.
e.g. p=1e.g. p=1
Exciting the flux tube
Lattice&model agree spectrum; decays in FT; starting in lattice
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2S: 1-
1S: 1-
1D: 1-
2+
1+
0+
770 780/1020
1460
1700
I=1 vector : I=0 nn*; ss*
1320 1270/1525
1300 1285/1530
1420
+ Problem of nn* ss* flavour mixing
Clean below S-wave MM thresholdsAnd no prominent G expected45
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2S: 1-
1S: 1-
1D: 1-
2+
1+
0+
770 780/1020
1460
1700
I=1 vector : I=0 nn*; ss*
1320 1270/1525
1300 1285/1530
1420 1370/1500/1710
+ Problem of nn* ss* flavour mixing
44
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2S: 1-
1S: 1-
1D: 1-
2+
1+
0+
770
1460
1700
I=1 vector : I=0 JP = 2+ 1+ 0+
13201270/1525
13001285/1530
1420 1370/1500/1710980 980/600
43
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Far away from qq* lowest multiplets… except for 0++
Glueballs spectrum in YangMills from Lattice
Optimist: is this a signal for scalar glueball?
41
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Only scalar glueballbelow 2 GeV
Glueballs spectrum in YangMills from Lattice
Optimist: is this a signal for scalar glueball?
42
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2S: 1-
1S: 1-
1D: 1-
2+
1+
0+
770
1460
1700
I=1 vector : I=0 JP = 2+ 1+ 0+
13201270/1525
13001285/1530
1420 1370/1500/1710980 980/600
1+
? qq* + Glueball
Lattice G =1.6 \pm
40
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2S: 1-
1S: 1-
1D: 1-
2+
1+
0+
770
1460
1700
I=1 vector : I=0 JP = 2+ 1+ 0+
13201270/1525
13001285/1530
1420 1370/1500/1710980 980/600
[qq][q*q*]
39
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2S: 1-
1S: 1-
1D: 1-
2+
1+
0+
770
1460
1700
I=1 vector : I=0 JP = 2+ 1+ 0+
13201270/1525
13001285/1530
1420 1370/1500/1710980 980/600
Data do not imply GBut given lattice and qq*Does consistent pic emerge?
Can data eliminate it; or even make it robust?
15/38
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Scalar Glueball and Mixing
s
n
G
16/37
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Scalar Glueball and Mixing
Meson
1710
1500
1370
s
n
G
36
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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
G
LEAR/WA102Meson pair decays
35
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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
0- 0- meson decays LEAR/WA102
FC Kirk
Scalar Glueball and Mixinga simple example for expt to rule out
Nontrivial correlationwith relative masses
heavy
l
lightmiddle
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Scalar Glueball and Mixing:how 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
33
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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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from BES
A flavour filter for 0++ 0-+ 2++mesons and glueballs
>1 billion 1000 per meson
Challenge: Turn Lattice QCD Glueball spectrum into physics31
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flux-tube degrees-of-freedom
c.m
.c.m
.
e.g. p=1e.g. p=1
Costs about 1 to 1.5GeV energy to excite phonon“pi/R”Hybrid qq* @ 2GeV; Hybrid cc* @ 4-4.5GeV
Barnes FC Swanson 93
Exotic 1-+ clean example
30
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\sim 2.2 GeV ss* quarks LGT \sim 2 GeV ud flavours
Michael…
29
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28
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Light flavor dangerPi very light = bigger threat e.g. pi b1 below 1-+ hybrid
26/27
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Light flavor dangerPi very light = bigger threat e.g. pi b1 below 1-+ hybrid
Heavy flavors: K D B more “normal”KK1 threshold vs ss*hybridDD1 threshold versus cc* hybridBB1 threshold versus bb* hybrid27/26
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Predicted 1-+ Hybrid masses (with spin splittings)
25
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29/24
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“Hybrid” and 3^3S_1almost decoupled
30/23
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Predicted 1-+ Hybrid masses (with spin splittings)
Spin hyperfine splittings
1- - (4.25) Y(4260?)1- + (4.1) HQLGT0- + (3.95) X(3940?)
Barnes FC 82Chanowitz Sharpe
e+e- feebly coupled
e+e- \to \psi + X?
22
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e+e- \to psi pi pi BaBar sees new vector cc*
Y(4260)
No sign of established3S/2D(4040/4160)4S(4400)in the psi pipi data
Y(4260) thus seemsanomalous
Also no place for extra cc* state
\Gamma(ee) 5-80eVCompare \sim 1 keV !!
But width 90MeV dominantly psi pipi !
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Belle e+e- to + X
???
0-+;1-+
33/20
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Masses OK. Need to go
Beyond spectroscopy:
Hybrid decays and production.
34/19
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What are the general properties of OZI strong decay?
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What properties
Michael McNeile 06
FC Burns 06
confirms Flux Tube for hybrid:conventional
Lattice S-wave decays now calculated Michael McNeile
Exactly WHAT is Lattice revealing about dynamics:What aspect(s) of Flux Tube model are being confirmed?
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2
qq* create in S=1
qq* create in S=0 0
38/15
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J – S = “L” Factorisation of S and L
qq* created in S=1
S=0 cannot decay to S=0 + S=0 “spin singlet selection rule”
Factorisation and S=1 creationis powerful result if generally true.
Determine nature of Y(4260) by DD_1 pattern
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SL Factorisation and S=1selection rules for psi*(cc*) \to DD_1
Also applies to KK_1 decays of ss* vectorse.g. Jlab around 2.2 GeV
40/13
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e+e- KK_1
phi pi pi
Intriguing resonantsignal at 2175
= phi(hybrid)??
2175 – m(phi)=4265 – m(psi)!!??
Jlablook indiffractive
41/12
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4260 decay if hybrid
Do data fit with this?
What next (theory and data)
42/11
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flux-tube breaking and hybrid decays
c.m
.c.m
.
e.g. p=1e.g. p=1
Break tube: S+P states yes; S+S suppressed
Isgur Paton 92 light exotics
FC Page 95 all
43/10
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flux-tube breaking and hybrid decays
c.m
.c.m
.
e.g. p=1e.g. p=1
Break tube: S+P states yes; S+S suppressed
Isgur Paton 92 light exotics
FC Page 95 all
Look for DD_1 and D*D_0 near threshold Look for psi pipi and h1c eta
44/9
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flux-tube breaking and hybrid decays
c.m
.c.m
.
e.g. p=1e.g. p=1
Break tube: S+P states yes; S+S suppressed
Isgur Paton 92 light exotics
FC Page 95 all
Look for DD_1 and D*D_0 near threshold Look for psi pipi and h1c eta
Absence of DD; DD*; DsDs …
45/8
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Y(4260): D_s and D_s* channels
NoDsDsresonance
eliminatestetraquarkcsc*s*
46/7
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Y(4260): D and D* channels
NoDDDD* orD*D*resonance
47/6
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The large psi +pi pi = hint of large DD1
D
D_1 uu * pi pi
psi
e+e- psi(hybrid) DD_1
S-wave, relative mom \sim 0; DD_1 interchange constituents to make psi pipi “strongly”
Similar for phi(hybrid) KK_1 phi pipi 48/5
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All consistent with predictions for hybrid charmoniumFC+Page 1995
Search DD_1 and D*D_0 in DD\pi\pi
If NOT hybrid cc* then why not/where is it ?!
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Can glueballs ever be (dis)proven?
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Can glueballs ever be (dis)proven?
Are valence hybrids drowned by continuum mesons?
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Can glueballs ever be (dis)proven?
Are valence hybrids drowned by continuum mesons?
Heavy flavours cleaner thy but less interesting for Jlab
ss*g & qq*g at Jlab – flavour dependence and sort out phenom
Lattice challenge = is there 1-+ qq*g signal or is it pi b1 where is the valence hybrid in mass
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Can glueballs ever be (dis)proven?
Are valence hybrids drowned by continuum mesons?
Heavy flavours cleaner thy but less interesting for Jlab
ss*g & qq*g at Jlab – flavour dependence and sort out phenom
Lattice challenge = is there 1-+ qq*g signal or is it pi b1 where is the valence hybrid in mass
Lattice challenge = do hybrids really prefer S+P decays(a lot of phenomenology/expt prejudice based on it)
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Can glueballs ever be (dis)proven?
Are valence hybrids drowned by continuum mesons?
Heavy flavours cleaner thy but less interesting for Jlab
ss*g & qq*g at Jlab – flavour dependence and sort out phenom
Lattice challenge = is there 1-+ qq*g signal or is it pi b1 where is the valence hybrid in mass
Lattice challenge = do hybrids really prefer S+P decays(a lot of phenomenology/expt prejudice based on it)
General challenge: rate for hybrid photo/electroprod sum rules = not suppressed (hidden assumptions) models primitive
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gamma rho
pi
hybrid
NN
yes no
Model assumed this
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gamma rho
pi
hybrid
NN
gamma rhohybrid
pi
hybrid
NN
yes
yes
no
no
Model assumed this
Model ignored this
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ss*g & qq*g at Jlab – flavour dependence and sort out phenom
Lattice radiative transitions now in progress (heavy flavors)Jlab group……hope for intuition on light flavour rates for Jlab
JLab Hybrids: Theory
JLab Hybrids: Experiment
Diffractive production of 1– at 2175MeV into phi pipi; KK1Hybrid S=0 cant make S=0+S=0: K+K(1P1)=0 test.K1(3P1:1P1) tests for 3S1:3D1:hybrid vector
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Scalar Glueball and Mixing
Meson G ss* nn*
1710 + + +1500 - + - 1370 + - -
s
n
G
3 state mixingRelative phases
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2S: 1-
1S: 1-
1D: 1-
2+
1+
0+
3686
3097
3415
3510
3556
3772
cc*)
29801S: 0-
36252S: 0-
Possible 0-+Glueball \sim 3.6 GeVImpact on eta_c’ ??
Compare in B decay, gamma gamma;ee \to psi + eta_c’