at ISMD 200 quarks Michal Praszalowicz Jagellonian University Krakow, Poland August 2005 Michal Praszalowicz, Krakow Exotic theory August 2005 Michal Praszalowicz, Krakow.
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at ISMD
200
5
quarks
Michal Praszalowicz Jagellonian University Krakow, Poland August 2005 Michal Praszalowicz, Krakow 1
Exotic theory
August 2005 Michal Praszalowicz, Krakow 2
2 Y
Exotic theory
[qqqq] 6 q
+
KN 10 August 2005 Michal Praszalowicz, Krakow I 3 3
Naive quark model expectations
Typical mass would be 5 310 + 150 = 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 August 2005 Michal Praszalowicz, Krakow 4
Evidence for exotics
Particle Data Group 1986 August 2005 Michal Praszalowicz, Krakow 5
From January 2003 (from T. Nakano)
Spring 8
DIANA JLab-d ELSA COSY-TOF HERMES CERN/NA49 H1 JLab-p ITEP ZEUS
pp S + + .
SVD/IHEP a lot of evidence Nomad
August 2005 Michal Praszalowicz, Krakow 6
August 2005 Michal Praszalowicz, Krakow 7
Evidence for exotics
August 2005 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 Michal Praszalowicz, Krakow 8
Conclusions
1. Still a convincing experiment is needed. Perhaps KN...
August 2005 Michal Praszalowicz, Krakow 9
Mass in different experiments
Final state: K + + n K 0 K 0 + p + p ?
August 2005 Michal Praszalowicz, Krakow A few % difference from 0, but ~20% difference from KN threshold 10
Naive quark model expectations
Typical mass would be 5 310 + 150 = 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 August 2005 Michal Praszalowicz, Krakow 11
Naive quark model expectations
Typical mass would be 5 1540 310 + 150 = 1700 MeV Large width expected: fall apart mode < 2 MeV Typical splittings 150 MeV for one strange quark: in octet: (2s) - N = 380 in decuplet: (3s) in antidecuplet: (2s) = 440 Spin 1/2 ... ?
Parity
(+) ?
Degenerate exotic octet ?
320
!
August 2005 Michal Praszalowicz, Krakow 12
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: 5 310 + 150 = 1700 August 2005 Michal Praszalowicz, Krakow 13
Conclusions
1. Still a convincing experiment is needed. Perhaps KN...
2. Mass small, natural in chiral soliton models August 2005 Michal Praszalowicz, Krakow 14
New CLAS results
Dave Tedeschi (USC), An overview of pentaquarks, Jlab users meeting 2005 August 2005 Michal Praszalowicz, Krakow 15
New g11 CLAS data E = 1.6 - 2.6 GeV E = 1.6 - 3.8 GeV R. De Vita, APS 2005; D. Tedeschi, Jlab 2005 August 2005 Michal Praszalowicz, Krakow 16
New g11 CLAS data K0 p K0 + n p p + K+ H. Lipkin, M. Karliner hep-ph/0506084 August 2005 Michal Praszalowicz, Krakow E = 1.6 - 2.6 GeV E = 1.6 - 3.8 GeV 17
New g10 CLAS data
d → K pK + (n)
Dave Tedeschi, Lei Guo, Jlab users meeting 2005 August 2005 Michal Praszalowicz, Krakow 18
New g10 CLAS data
d → K pK + (n)
Rescattering required in order to "kick out" the proton from deuteron August 2005 e.g. Kubarovsky, Stepanyan, hep-ex/0307088 Michal Praszalowicz, Krakow 19
New LEPS result
T. Nakano, QCD@Beijing 2005 T. Hotta, Acta Phys. Pol. B36, 2173 August 2005
Conclusions
1. Still a convincing experiment is needed. Perhaps KN...
2. Mass small, natural in chiral soliton models 3. More experiments production mechanism August 2005 Michal Praszalowicz, Krakow 21
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 August 2005 Michal Praszalowicz, Krakow 22
Spin and parity
S. Sasaki, talk at Spring-8 August 2005 Michal Praszalowicz, Krakow 23
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 August 2005 Michal Praszalowicz, Krakow 24
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 • COSY (p p) 18 1.6 4 MeV • HERMES (e p) 17 • DUBNA (bubbl.ch.) 16 MeV 9 3 MeV 4 MeV Phase shifts: < 2 MeV S.Nussinov, hep-ph/0307357; R.Arndt, I.Strakovsky, R.Workman, nucl-th/0308012 August 2005 Michal Praszalowicz, Krakow 25
Width in the soliton model
D.Diakonov, V.Petrov, M.Polyakov, Z.Phys A359 (97 ) SU(3) relations August 2005 Decuplet decay: Antidecuplet decay: In NRQM limit: Michal Praszalowicz, Krakow MP, PLB 583 (04) 96; A.Blotz, MP, K.Goeke
PLB 354 (1995) 415 26
Width in the soliton model
D.Diakonov, V.Petrov, M.Polyakov, Z.Phys A359 (97 ) < 15 MeV SU(3) relations Decuplet decay: Antidecuplet decay: August 2005 In reality: However, G 10 is still small Michal Praszalowicz, Krakow 27
Why width is so small?
D.Diakonov, V.Petrov
hep-ph/0505201 August 2005 Michal Praszalowicz, Krakow 28
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 August 2005 Michal Praszalowicz, Krakow 29
Further exotics
August 2005 Michal Praszalowicz, Krakow NA49 30
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 7. Confirmation of important impact on theory 6. Width is extremly small, hard to understand (1860) is badly needed August 2005 Michal Praszalowicz, Krakow 31
August 2005
Further exotics
Are these staes known PDG resonances or are there new narrow states still to be discovered?
PWA Arndt et al., nucl-th/0312126; GRAAL V.Kuznetsov, hep-ex/040932 STAR S.Kabana, hep-ex/040632 Michal Praszalowicz, Krakow 32
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 7. Confirmation of important impact on theory 6. Width is extremly small, hard to understand (1860) is badly needed 8. New nucleon-like and sigma-like resonances ?
August 2005 Michal Praszalowicz, Krakow 33
Beyond antidecuplet
mixing due to the SU(3) symmetry breaking August 2005 Michal Praszalowicz, Krakow 34
Effects of mixing
SU(3) relations August 2005 Michal Praszalowicz, Krakow 35
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, PRD70:036003 (2004) D.Diakonov, V.Petrov, PRD69:094011 (2004) R.Arndt et al. PRC69:035208 (2004) V.Guzey, M.Polyakov, Ann.Phys. 13 (3004) 673; hep-ph/0501010 August 2005 Michal Praszalowicz, Krakow 36
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 9. N
*
, S
*
+ is most probably 1/2 5. Measure parity 7. Confirmation of important impact on theory 6. Width is extremly small, hard to understand (1860) is badly needed 8. New nucleon-like and sigma-like resonances ?
masses and widths will suffer from mixing 10. SU(3) relations for widths will not hold !
August 2005 Michal Praszalowicz, Krakow 37
Further exotics
++
Some indications for ++ in data exist August 2005 In quark models antidecuplet of spin 1/2 and 3/2 are nearly degenerate in mass Michal Praszalowicz, Krakow 38
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 9. N
*
, S
*
+ is most probably 1/2 5. Measure parity 7. Confirmation of 11. Further exotics: important impact on theory 6. Width is extremly small, hard to understand (1860) is badly needed 8. New nucleon-like and sigma-like resonances ?
masses and widths will suffer from mixing 10. SU(3) relations for widths will not hold !
++ or antidecuplet of spin 3/2 ...
August 2005 Michal Praszalowicz, Krakow 39
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 9. N
*
, S
*
+ is most probably 1/2 5. Measure parity 7. Confirmation of 11. Further exotics: important impact on theory 6. Width is extremly small, hard to understand (1860) is badly needed 8. New nucleon-like and sigma-like resonances ?
masses and widths will suffer from mixing 10. SU(3) relations for widths will not hold !
++ or antidecuplet of spin 3/2 ...
August 2005 Michal Praszalowicz, Krakow 40
August 2005 Michal Praszalowicz, Krakow 41
Is Nature similing or laughing at us?
Is Nature similing or laughing at us?
Effects of mixing in soliton model
modification factor residual freedom in soliton model August 2005 Michal Praszalowicz, Krakow 44