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 CD

Only discuss hadrons that are either Agreed to experimentally exist

Only discuss hadrons that are either Agreed to experimentally existAgreed experimentally to exist

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

Arndt Buccella Carlson Dyakanov Ellis Faber Giannini Huang Inoue Jaffe Karliner Lipkin Maltman Nussinov Oh Polyakov Qiang Rosner Stech Trilling U Veneziano Wilczek Xiang Yang Zhu If Theta pentaquark doesn’t exist, then these (and many other theorists) should be congratulated on their creativity Pentaquark

Somethings are deceptively simple m(Bc) = (4.0) (2.7)

Somethings are deceptively simple m(Bc) = (4.0) (2.7) m(c)+m(b) ~ ½[m(psi) + m(upsilon)] = Heavy mass scale of c and b make agreements look artificially good better than 1 per mille !

Somethings are deceptively simple m(Bc) = (4.0) (2.7) m(c)+m(b) ~ ½[m(psi) + m(upsilon)] = 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

2S: 1- 1S: 1- 1D:  cc*) Narrow below MM threshold Another gift of nature

2S: 1- 1S: 1- 1D:  cc*) Lattice QCD: Linear: Flux tube…..implies…

Gluonic hybrid mesons c.m. e.g. p=1 Exciting the flux tube Lattice&model agree spectrum; decays in FT; starting in lattice

2S: 1- 1S: 1- 1D: / I=1 vector : I=0 nn*; ss* / / Problem of nn* ss* flavour mixing Clean below S-wave MM thresholds And no prominent G expected 45

2S: 1- 1S: 1- 1D: / I=1 vector : I=0 nn*; ss* / / /1500/ Problem of nn* ss* flavour mixing 44

2S: 1- 1S: 1- 1D: I=1 vector : I=0 J P = / / /1500/ /600 43

Far away from qq* lowest multiplets… except for 0++ Glueballs spectrum in YangMills from Lattice Optimist: is this a signal for scalar glueball? 41

Only scalar glueball below 2 GeV Glueballs spectrum in YangMills from Lattice Optimist: is this a signal for scalar glueball? 42

2S: 1- 1S: 1- 1D: I=1 vector : I=0 J P = / / /1500/ / ? qq* + Glueball Lattice G =1.6 \pm 40

2S: 1- 1S: 1- 1D: I=1 vector : I=0 J P = / / /1500/ /600 [qq][q*q*] 39

2S: 1- 1S: 1- 1D: I=1 vector : I=0 J P = / / /1500/ /600 Data do not imply G But given lattice and qq* Does consistent pic emerge? Can data eliminate it; or even make it robust? 15/38

Scalar Glueball and Mixing s n G 16/37

Scalar Glueball and Mixing Meson s n G 36

Scalar Glueball and Mixing Meson G ss* nn* s n G LEAR/WA102 Meson pair decays 35

Meson G ss* nn* s n meson decays LEAR/ WA102 FC Kirk Scalar Glueball and Mixing a simple example for expt to rule out Nontrivial correlation with relative masses heavy l light middle

Scalar Glueball and Mixing: how to measure flavour state Meson G ss* nn* s n 33

Scalar Glueball and Mixing Meson G ss* nn* s n

from BES A flavour filter for mesons and glueballs >1 billion 1000 per meson Challenge: Turn Lattice QCD Glueball spectrum into physics 31

flux-tube degrees-of-freedom c.m. e.g. p=1 Costs about 1 to 1.5GeV energy to excite phonon “pi/R” Hybrid 2GeV; Hybrid 4-4.5GeV Barnes FC Swanson 93 Exotic 1-+ clean example 30

\sim 2.2 GeV ss* quarks LGT \sim 2 GeV ud flavours Michael… 29

28

Light flavor danger Pi very light = bigger threat e.g. pi b1 below 1-+ hybrid 26/27

Light flavor danger Pi very light = bigger threat e.g. pi b1 below 1-+ hybrid Heavy flavors: K D B more “normal” KK1 threshold vs ss*hybrid DD1 threshold versus cc* hybrid BB1 threshold versus bb* hybrid 27/26

Predicted 1-+ Hybrid masses (with spin splittings) 25

29/24

“Hybrid” and 3^3S_1 almost decoupled 30/23

Predicted 1-+ Hybrid masses (with spin splittings) Spin hyperfine splittings 1- - (4.25) Y(4260?) 1- + (4.1) HQLGT 0- + (3.95) X(3940?) Barnes FC 82 Chanowitz Sharpe e+e- feebly coupled e+e- \to \psi + X? 22

e+e- \to psi pi pi BaBar sees new vector cc* Y(4260) No sign of established 3S/2D(4040/4160) 4S(4400) in the psi pipi data Y(4260) thus seems anomalous Also no place for extra cc* state \Gamma(ee) 5-80eV Compare \sim 1 keV !! But width 90MeV dominantly psi pipi !

Belle e+e- to + X ??? 0-+;1-+ 33/20

Masses OK. Need to go Beyond spectroscopy: Hybrid decays and production. 34/19

What are the general properties of OZI strong decay?

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?

2 qq* create in S=1 qq* create in S=0 0 38/15

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 creation is powerful result if generally true. Determine nature of Y(4260) by DD_1 pattern

SL Factorisation and S=1 selection rules for psi*(cc*) \to DD_1 Also applies to KK_1 decays of ss* vectors e.g. Jlab around 2.2 GeV 40/13

e+e- KK_1 phipi Intriguing resonant signal at 2175 = phi(hybrid)?? 2175 – m(phi) = 4265 – m(psi) !!?? Jlab look in diffractive 41/12

4260 decay if hybrid Do data fit with this? What next (theory and data) 42/11

flux-tube breaking and hybrid decays c.m. e.g. p=1 Break tube: S+P states yes; S+S suppressed Isgur Paton 92 light exotics FC Page 95 all 43/10

flux-tube breaking and hybrid decays c.m. e.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

flux-tube breaking and hybrid decays c.m. e.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

Y(4260): D_s and D_s* channels No DsDs resonance eliminates tetraquark csc*s* 46/7

Y(4260): D and D* channels No DD DD* or D*D* resonance 47/6

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

All consistent with predictions for hybrid charmonium FC+Page 1995 Search DD_1 and D*D_0 in DD\pi\pi If NOT hybrid cc* then why not/where is it ?!

Can glueballs ever be (dis)proven?

Are valence hybrids drowned by continuum mesons?

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

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)

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

gamma rho pi hybrid N N yesno Model assumed this

gamma rho pi hybrid N N gamma rhohybrid pi hybrid N N yes no Model assumed this Model ignored this

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; KK1 Hybrid S=0 cant make S=0+S=0: K+K(1P1)=0 test. K1(3P1:1P1) tests for 3S1:3D1:hybrid vector

Scalar Glueball and Mixing Meson G ss* nn* s n G 3 state mixing Relative phases

2S: 1- 1S: 1- 1D:  cc*) S: S: 0- Possible 0-+ Glueball \sim 3.6 GeV Impact on eta_c’ ?? Compare in B decay, gamma gamma; ee \to psi + eta_c’