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