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August 2005Michal Praszalowicz, Krakow1 quarks Michal Praszalowicz Jagellonian University Krakow, Poland at ISMD 200 5.

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Presentation on theme: "August 2005Michal Praszalowicz, Krakow1 quarks Michal Praszalowicz Jagellonian University Krakow, Poland at ISMD 200 5."— Presentation transcript:

1 August 2005Michal Praszalowicz, Krakow1 quarks Michal Praszalowicz Jagellonian University Krakow, Poland at ISMD 200 5

2 August 2005Michal Praszalowicz, Krakow2 Exotic theory

3 August 2005Michal Praszalowicz, Krakow3 Exotic theory Y 2 I3I3  +  KN  10 [qqqq] 6  q

4 August 2005Michal Praszalowicz, Krakow4 Naive quark model expectations Typical mass would be 5  = 1700 MeV Large width expected: fall apart mode Typical splittings 150 MeV for one strange quark: in octet:  (2s) - N = 380 in decuplet:  (3s) -  = 440 in antidecuplet:  (2s) -  (s) = 150 Spin 1/2... Parity (-) Degenerate exotic octet

5 August 2005Michal Praszalowicz, Krakow5 Evidence for exotics Particle Data Group 1986

6 August 2005Michal Praszalowicz, Krakow6 ELSA JLab-p HERMES ITEP pp   +  +. COSY-TOF DIANA SVD/IHEP JLab-d ZEUS CERN/NA49 H1 Nomad a lot of evidence Spring 8 From January 2003 (from T. Nakano)

7 August 2005Michal Praszalowicz, Krakow7

8 August 2005Michal Praszalowicz, Krakow8 Evidence for exotics None of these experiments was designed to look for exotics 2004 LEPS and CLAS high statistics runs gave mixed results: LEPS + CLAS --  a few comments later

9 August 2005Michal Praszalowicz, Krakow9 Conclusions 1.Still a convincing experiment is needed. Perhaps KN...

10 August 2005Michal Praszalowicz, Krakow10 Mass in different experiments Final state: K 0 + p K + + n K 0 + p ? A few % difference from 0, but ~20% difference from KN threshold

11 August 2005Michal Praszalowicz, Krakow11 Naive quark model expectations Typical mass would be 5  = 1700 MeV Large width expected: fall apart mode Typical splittings 150 MeV for one strange quark: in octet:  (2s) - N = 380 in decuplet:  (3s) -  = 440 in antidecuplet:  (2s) -  (s) = 150 Spin 1/2... Parity (-) Degenerate exotic octet

12 August 2005Michal Praszalowicz, Krakow12 Naive quark model expectations Typical mass would be 5  = 1700 MeV Large width expected: fall apart mode Typical splittings 150 MeV for one strange quark: in octet:  (2s) - N = 380 in decuplet:  (3s) -  = 440 in antidecuplet:  (2s) -  (s) = 150 Spin 1/2... ? Parity (+) ? Degenerate exotic octet ? 320 !  1540  < 2 MeV

13 August 2005Michal Praszalowicz, Krakow13 Soliton Models Biedenharn, Dothan (1984):  10-8 ~ 600 MeV from Skyrme model MP (1987): M  = 1535 MeV from Skyrme model in model independent approach, second order Diakonov, Petrov, Polyakov (1997):  QM - model independent approach, 1/N c corrections  M  = 1530 MeV small width < 15 MeV ! In soliton models quark-antiquark excitation is added as a chiral excitation, therefore the masses are predicted to be small in comparison with the naive QM: 5  = 1700

14 August 2005Michal Praszalowicz, Krakow14 Conclusions 1.Still a convincing experiment is needed. Perhaps KN... 2.Mass small, natural in chiral soliton models

15 August 2005Michal Praszalowicz, Krakow15 New CLAS results Dave Tedeschi (USC), An overview of pentaquarks, Jlab users meeting 2005

16 August 2005Michal Praszalowicz, Krakow16 New g11 CLAS data E  = GeV E  = GeV R. De Vita, APS 2005; D. Tedeschi, Jlab 2005

17 August 2005Michal Praszalowicz, Krakow17 New g11 CLAS data E  = GeV E  = GeV H. Lipkin, M. Karliner hep-ph/

18 August 2005Michal Praszalowicz, Krakow18 New g10 CLAS data  d → K - pK + (n) Dave Tedeschi, Lei Guo, Jlab users meeting 2005

19 August 2005Michal Praszalowicz, Krakow19 New g10 CLAS data  d → K - pK + (n) Rescattering required in order to "kick out" the proton from deuteron e.g. Kubarovsky, Stepanyan, hep-ex/

20 August 2005 New LEPS result T. Nakano, 2005 T. Hotta, Acta Phys. Pol. B36, 2173

21 August 2005Michal Praszalowicz, Krakow21 Conclusions 1.Still a convincing experiment is needed. Perhaps KN... 2.Mass small, natural in chiral soliton models 3.More experiments  production mechanism

22 August 2005Michal Praszalowicz, Krakow22 Spin and parity Unknown, in most models S = 1/2 parity: + - ChSM, correlated QM, QM with flavor dep.forces, 1  lattice parity: - - uncorrelated QM (but wider), lattice (if at all), SumRules

23 August 2005Michal Praszalowicz, Krakow23 Spin and parity S. Sasaki, talk at Spring-8

24 August 2005Michal Praszalowicz, Krakow24 Conclusions 1.Still a convincing experiment is needed. Perhaps KN... 2.Mass small, natural in chiral soliton models 3.More experiments  production mechanism 4.Spin of  + is most probably 1/2 5.Measure parity  important impact on theory

25 August 2005Michal Praszalowicz, Krakow25 Width Most experiments give only upper limits: CLAS (  p) < 23 MeV DIANA (K + Xe) < 9 MeV However, some other experiments quote errors: ZEUS (DIS) 6.1  1.6  MeV COSY (p p) 18  4 MeV HERMES (e p) 17  9  3 MeV DUBNA (bubbl.ch.) 16  4 MeV Phase shifts: < 2 MeV S.Nussinov, hep-ph/ ; R.Arndt, I.Strakovsky, R.Workman, nucl-th/

26 August 2005Michal Praszalowicz, Krakow26 Width in the soliton model Decuplet decay: Antidecuplet decay: In NRQM limit: SU(3) relations  D.Diakonov, V.Petrov, M.Polyakov, Z.Phys A359 (97) MP, PLB 583 (04) 96; A.Blotz, MP, K.Goeke PLB 354 (1995) 415

27 August 2005Michal Praszalowicz, Krakow27 Width in the soliton model Decuplet decay: Antidecuplet decay: SU(3) relations  < 15 MeV In reality: However, G 10 is still small D.Diakonov, V.Petrov, M.Polyakov, Z.Phys A359 (97)

28 August 2005Michal Praszalowicz, Krakow28 Why width is so small? D.Diakonov, V.Petrov hep-ph/

29 August 2005Michal Praszalowicz, Krakow29 Conclusions 1.Still a convincing experiment is needed. Perhaps KN... 2.Mass small, natural in chiral soliton models 3.More experiments  production mechanism 4.Spin of  + is most probably 1/2 5.Measure parity  important impact on theory 6.Width is extremly small, hard to understand

30 August 2005Michal Praszalowicz, Krakow30 Further exotics NA49

31 August 2005Michal Praszalowicz, Krakow31 Conclusions 1.Still a convincing experiment is needed. Perhaps KN... 2.Mass small, natural in chiral soliton models 3.More experiments  production mechanism 4.Spin of  + is most probably 1/2 5.Measure parity  important impact on theory 6.Width is extremly small, hard to understand 7.Confirmation of  (1860) is badly needed

32 August 2005Michal Praszalowicz, Krakow32 Further exotics Are these staes known PDG resonances or are there new narrow states still to be discovered? PWA-Arndt et al., nucl-th/ ; GRAAL-V.Kuznetsov, hep-ex/ STAR-S.Kabana, hep-ex/040632

33 August 2005Michal Praszalowicz, Krakow33 Conclusions 1.Still a convincing experiment is needed. Perhaps KN... 2.Mass small, natural in chiral soliton models 3.More experiments  production mechanism 4.Spin of  + is most probably 1/2 5.Measure parity  important impact on theory 6.Width is extremly small, hard to understand 7.Confirmation of  (1860) is badly needed 8.New nucleon-like and sigma-like resonances ?

34 August 2005Michal Praszalowicz, Krakow34 Beyond antidecuplet mixing due to the SU(3) symmetry breaking

35 August 2005Michal Praszalowicz, Krakow35 Effects of mixing SU(3) relations

36 August 2005Michal Praszalowicz, Krakow36 Effects of mixing SU(3) relations Since G 10 is small even moderate admixtures of other representations will violate SU(3) relations J.Ellis, M.Karliner, MP, JHEP 0405:002,2004 MP, Acta Phys. Pol. B35 (2004) 1625 S.Pakvasa, M.Suzuki, PRD70: (2004) D.Diakonov, V.Petrov, PRD69: (2004) R.Arndt et al. PRC69: (2004) V.Guzey, M.Polyakov, Ann.Phys. 13 (3004) 673; hep-ph/

37 August 2005Michal Praszalowicz, Krakow37 Conclusions 1.Still a convincing experiment is needed. Perhaps KN... 2.Mass small, natural in chiral soliton models 3.More experiments  production mechanism 4.Spin of  + is most probably 1/2 5.Measure parity  important impact on theory 6.Width is extremly small, hard to understand 7.Confirmation of  (1860) is badly needed 8.New nucleon-like and sigma-like resonances ? 9.N *,  * masses and widths will suffer from mixing 10.SU(3) relations for widths will not hold !

38 August 2005Michal Praszalowicz, Krakow38 Further exotics  ++ Some indications for  ++ in data exist In quark models antidecuplet of spin 1/2 and 3/2 are nearly degenerate in mass

39 August 2005Michal Praszalowicz, Krakow39 Conclusions 1.Still a convincing experiment is needed. Perhaps KN... 2.Mass small, natural in chiral soliton models 3.More experiments  production mechanism 4.Spin of  + is most probably 1/2 5.Measure parity  important impact on theory 6.Width is extremly small, hard to understand 7.Confirmation of  (1860) is badly needed 8.New nucleon-like and sigma-like resonances ? 9.N *,  * masses and widths will suffer from mixing 10.SU(3) relations for widths will not hold ! 11.Further exotics:  ++ or antidecuplet of spin 3/2...

40 August 2005Michal Praszalowicz, Krakow40 Conclusions 1.Still a convincing experiment is needed. Perhaps KN... 2.Mass small, natural in chiral soliton models 3.More experiments  production mechanism 4.Spin of  + is most probably 1/2 5.Measure parity  important impact on theory 6.Width is extremly small, hard to understand 7.Confirmation of  (1860) is badly needed 8.New nucleon-like and sigma-like resonances ? 9.N *,  * masses and widths will suffer from mixing 10.SU(3) relations for widths will not hold ! 11.Further exotics:  ++ or antidecuplet of spin 3/2...

41 August 2005Michal Praszalowicz, Krakow41

42 Is Nature similing or laughing at us?

43

44 August 2005Michal Praszalowicz, Krakow44 Effects of mixing in soliton model modification factor residual freedom in soliton model 


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