The meson landscape

1. 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

2. Only discuss hadrons that are either Agreed to experimentally exist

3. Only discuss hadrons that are either Agreed to experimentally exist Agreed experimentally to exist

4. Only discuss hadrons that are either Agreed to experimentally exist Agreed experimentally to exist or Agreed theoretically should exist Life is hard enough anyway and theorists are easily led astray

5. Pentaquark 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

6. Somethings are deceptively simple m(Bc) = 6276.5 (4.0) (2.7)

7. Somethings are deceptively simple m(Bc) = 6276.5 (4.0) (2.7) m(c)+m(b) ~ ½[m(psi) + m(upsilon)] = 6278.6 better than 1 per mille ! Heavy mass scale of c and b make agreements look artificially good

8. Somethings are deceptively simple m(Bc) = 6276.5 (4.0) (2.7) m(c)+m(b) ~ ½[m(psi) + m(upsilon)] = 6278.6 better than 1 per mille ! Heavy mass scale of c and b make agreements look artificially good WHYdoes it work so well? Constituent d.o.f.robust=gift of nature

9. (cc*) Another gift of nature 3772 1D: 1- 10023 3686 2S: 1- 3556 9913 2+ 9893 3510 1+ 9860 3415 0+ 9460 3097 1S: 1- Narrow below MM threshold

10. (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…

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

12. I=1 vector : I=0nn*; ss* + Problem of nn* ss* flavour mixing 1700 1D: 1- 1460 2S: 1- 1320 1270/1525 2+ 1300 1285/1530 1+ 1420 0+ 770 780/1020 1S: 1- Clean below S-wave MM thresholds And no prominent G expected 45

13. I=1 vector : I=0nn*; 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- 44

14. I=1 vector : I=0JP =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- 43

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

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

17. I=1 vector : I=0JP =2+ 1+ 0+ 1700 1D: 1- 1460 2S: 1- 13201270/1525 2+ ? qq* + Glueball 13001285/1530 Lattice G =1.6 \pm 1+ 1+ 1420 1370/1500/1710 0+ 980 980/600 770 1S: 1- 40

18. I=1 vector : I=0JP =2+ 1+ 0+ 1700 1D: 1- 1460 2S: 1- 13201270/1525 2+ 13001285/1530 1+ 1420 1370/1500/1710 0+ [qq][q*q*] 980 980/600 770 1S: 1- 39

19. I=1 vector : I=0JP =2+ 1+ 0+ 1700 1D: 1- 1460 2S: 1- 13201270/1525 Data do not imply G But given lattice and qq* Does consistent pic emerge? 2+ 13001285/1530 1+ Can data eliminate it; or even make it robust? 1420 1370/1500/1710 0+ 980 980/600 770 1S: 1- 15/38

20. Scalar Glueball and Mixing s G n 16/37

21. Scalar Glueball and Mixing • Meson • 1710 • 1500 • 1370 s G n 36

22. Scalar Glueball and Mixing • Meson G ss*nn* • 1710 0.39 0.910.15 • 1500 - 0.650.33- 0.70 • 1370 0.69- 0.15 - 0.70 s G n LEAR/WA102 Meson pair decays 35

23. Scalar Glueball and Mixinga simple example for expt to rule out • Meson G ss*nn* • 1710 0.39 0.910.15 • 1500 - 0.650.33- 0.70 • 1370 - 0.690.150.70 0- 0- meson decays LEAR/ WA102 FC Kirk s n l Nontrivial correlation with relative masses middle light heavy

24. Scalar Glueball and Mixing:how to measure flavour state • Meson G ss*nn* • 1710 0.39 0.910.15 • 1500 - 0.650.33- 0.70 • 1370 0.69-0.15 - 0.70 s n 33

25. Scalar Glueball and Mixing • Meson G ss*nn* • 1710 0.39 0.910.15 • 1500 - 0.650.33- 0.70 • 1370 0.69-0.15 - 0.70 s n

26. 1000 per meson from BES >1 billion A flavour filter for 0++ 0-+ 2++ mesons and glueballs Challenge: Turn Lattice QCD Glueball spectrum into physics 31

27. e.g. p=1 c.m. flux-tube degrees-of-freedom 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

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

29. 28

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

31. 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

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

33. 29/24

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

35. 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

36. e+e- \to psi pi pi BaBar sees new vector cc* 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 !! Y(4260) But width 90MeV dominantly psi pipi !

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

38. Masses OK. Need to goBeyond spectroscopy:Hybrid decays and production. 34/19

39. What are the general properties of OZI strong decay?

41. What properties Lattice S-wave decays now calculatedMichael McNeile confirms Flux Tube for hybrid:conventional Michael McNeile 06 FC Burns 06 Exactly WHAT is Lattice revealing about dynamics: What aspect(s) of Flux Tube model are being confirmed?

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

43. J – S = “L” Factorisation of S and L qq* created in S=1 Factorisation and S=1 creation is powerful result if generally true. S=0 cannot decay to S=0 + S=0 “spin singlet selection rule” Determine nature of Y(4260) by DD_1 pattern

44. 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

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

46. 4260 decay if hybrid Do data fit with this? What next (theory and data) 42/11

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

48. e.g. p=1 c.m. flux-tube breaking and hybrid decays Isgur Paton 92 light exotics FC Page 95 all Break tube: S+P states yes; S+S suppressed Look for DD_1 and D*D_0near threshold Look for psi pipi and h1c eta 44/9

49. e.g. p=1 c.m. flux-tube breaking and hybrid decays Isgur Paton 92 light exotics FC Page 95 all Break tube: S+P states yes; S+S suppressed Look for DD_1 and D*D_0near threshold Look for psi pipi and h1c eta Absence of DD; DD*; DsDs … 45/8

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