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Penta-quark states from Strangeness to charm and beauty

Penta-quark states from Strangeness to charm and beauty. Bing-Song Zou Institute of Theoretical Physics, CAS, Beijing. Outline : Introduction Penta-quark states with strangeness From Strangeness to charm & beauty Conclusions. s. n(udd). p(uud). △ -. △ 0. △ +. △ ++.

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Penta-quark states from Strangeness to charm and beauty

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  1. Penta-quark states from Strangeness to charm and beauty Bing-Song Zou Institute of Theoretical Physics, CAS, Beijing

  2. Outline : • Introduction • Penta-quark states with strangeness • From Strangeness to charm & beauty • Conclusions

  3. s n(udd) p(uud) △- △0 △+ △++ (uuu) (ddd) (udd) (uud) 0 (uds) + (uus) 0 *- *+ -(dds) I3 0 (uus) (dds) (uds) *- *0 (uss) (dss) -(dss) 0(uss) - (sss) • Introduction • Spectroscopy  interaction dynamics & structures atomic spectrum  atomic quantum theory nuclear spectrum  shell model, collective motion hadron spectrum  ? Important discovery L=0 1/2 + 3/2 + Prediction m- 1670 MeV experiment m- 1672.45 0.29 MeV SU(3) 3q-quark model for baryons 3

  4. Key problem in QCD and hadron structure Quark confinement – self-interaction of gluons d - u u gluons `qq : crucial for quark confinement and hadron structure to be more challenging than atomic and nuclear structures The number of constituents in a hadron is not a constant! - d

  5. 2. Penta-quark states with strangeness • 1/2- baryon nonet : quenched or unquenched ? • uds (L=1) 1/2- ~ L*(1670) ~ [us][ds]`s • uud (L=1) 1/2- ~ N*(1535) ~ [ud][us]`s • uds (L=1) 1/2- ~ L*(1405) ~ [ud][su]`u • uus (L=1) 1/2- ~ S*(1390) ~ [us][ud]`d • Zou et al, NPA835 (2010) 199 ; CLAS, PRC87(2013)035206 • Strange decays of N*(1535) and L*(1670) : • N*(1535) large couplings gN*Nh , gN*KL，gN*Nh’，gN*Nf • L*(1670) large coupling gL*Lh • B.C.Liu, B.S.Zou, PRL96(2006)042002 ,“Mass and KΛ Coupling of the N*(1535)”

  6. u u S S u u `s `s d d u u d d u u The breathing mode for the N*(1535) Important role for N* EM form factor An & Zou, EPJA39(2009)195

  7. Alternative pictures : Hadronic molecules N*(1440) ~ Ns N*(1535) ~ KS-KL L*(1405) ~ KN-Sp Penta-quark states N*(1440) ~ [ud][ud]`q N*(1535) ~ [ud][us]`s L*(1405) ~ [ud][sq]`q Kaiser, Weise, Oset, Ramos, Oller, Meissner, Hyodo, Jido, Hosaka, … • Important implications: • `qqqqq in S-state more favorable than qqq with L=1 !

  8. Distinctive Predictions by quenched - & unquenched - quark models Quenched quark model: Capstick-Roberts, Prog.Part.Nucl.Phys. 45 (2000) S241-S331  Unquenched model: Helminen-Riska , Nucl. Phys. A 699 (2002) 624 A.Zhang, S.L.Zhu et al.,  HEPNP 29 (2005) 250

  9. New results on S* & L* from CB data Crystal Ball：Prakhov et al., PRC 80(2009) 025204 & pK=514-750 MeV, The high precision new data can give valuable information on S* & L* S* or L* P.Gao, B.S.Zou, A.Sibirtsev, NPA867(2011)41 NPA referee: “This is an excellent, clear, concise and convincing piece of work. I wish we saw more analyses like this.”

  10. new CB data on K-pπ0Λ :No S(1620) 1/2- needed !! with basic ingredients adding S(1635) 1/2+ CBL Polarization data is crucial for discriminating S(1620)1/2- from S(1635) 1/2+ PDG2014 downgrades S(1620)1/2- from ** to *

  11. Fits to new CB data on K-p π0S0 J.Shi, B. S. Zou, PRC91(2015)035202 L*(1680)3/2+replacesL*(1690)3/2-**** Strong support for unquenched quark model!

  12. 3. From strangeness to charm & beauty Many N* & L* are proposed to be dynamically generated states and penta-quark states Problem: None of them can be clearly distinguished from qqq due to tunable ingredients and possible large mixing of various configurations PDG2010: “The clean Λc spectrum has in fact been taken to settle the decades-long discussion about the nature of the Λ(1405) —true 3-quark state or mere`KN threshold effect?— unambiguously in favor of the first interpretation.” although Lc (2595) 1/2- was proposed to be DN molecule by Tolos et al., CPC33(2009)1323. Haidenbauer et al., EPJA47(2011)18

  13. Solution: Extension to hidden charm and beauty for baryons N*(1535) `ssuud N*(4260) `ccuud J.J.Wu, R.Molina, E.Oset, B.S.Zou. Phys.Rev.Lett. 105 (2010) 232001 N*(11050) `bbuud J.J.Wu, L.Zhao, B.S.Zou. PLB709(2012)70 L*(1405) `qquds L*(4210) `ccuds J.J.Wu, R.Molina, E.Oset, B.S.Zou. Phys.Rev.Lett. 105 (2010) 232001 L*(11020) `bbuds J.J.Wu, L.Zhao, B.S.Zou. PLB709(2012)70

  14. N* `DSc L* N* `D*Sc L* Super-heavy narrow N* and L* with hidden charm Definitely not qqq states !

  15. Hidden charm N* above 4 GeV decaying to pJ/y are supported by other approaches `DSc +`D*Sc coupled channel state ~ 4.23 GeV T. Uchino, W.H.Liang, E.Oset, arXiv:1504.05726 `DSc state in a chiral quark model ~ 4.3 GeV W.L.Wang, F.Huang, Z.Y.Zhang, B.S.Zou, PRC84(2011)015203 `DSc state in EBAC-DCC model ~ 4.3 GeV J.J.Wu, T.S.H.Lee, B.S.Zou, PRC85(2012)044002 `DSc state in Schoedinger Equation method ~ 4.3 GeV Z.C.Yang, Z.F. Sun, J. He, X.Liu, S.L.Zhu,  CPC36(2012)6 `ccqqq with 3 kinds of qq hyperfine interaction ~ 4.1 GeV S.G.Yuan, K.W.Wei, J.He, H.S.Xu, B.S.Zou, EPJA48(2012)61

  16. Prediction for PANDA `pp g`ppJ/y ~ 0.1 nb ~ 100 events per day at PANDA/FAIR by L=1031 cm-2s-1 These Super-heavy narrow N* and L* can be found at PANDA !

  17. Prediction for 12GeV@JLab Y. Huang, J.He, H.F.Zhang and X.R.Chen, JPG41, 115004 (2014)

  18. LHCb, Phys.Rev.Lett. 115 (2015) 072001:   Observation of two N* from 1) 4380±8±29 MeV , 205±18±86 MeV, 3/2- Pc+(4380) compatible with our predicted N*(4412) 3/2- 2) 4450±2±3 MeV , 39±5±19 MeV, 5/2+ Pc+(4450) Is this our prediced lowest N*(4300) 1/2-

  19. Other theoretical explanations on LHCb results: • Thresholds `DSc* (4383MeV), `D*Sc (4460MeV), pcc1 (4449MeV) • 1) `DSc* ,`D*Sc ,`D*Sc * bound states • R.Chen, X.Liu, X.Qi.Li, S.L.Zhu, arXiv:1507.03704 [hep-ph]; • L.Roca, J.Nieves, E.Oset, arXiv:1507.04249 [hep-ph]; • J.He, arXiv:1507.05200 [hep-ph]; • diquark cu & triquark`c(ud) states • L.Maiani, A.D.Polosa, V. Riquer, arXiv:1507.04980 [hep-ph]; • R.Lebed, arXiv:1507.05867 [hep-ph]; • V.Anisovich et al., arXiv:1507.07652 [hep-ph]; • G.N.Li, M.He, X.G.He, arXiv:1507.08252 [hep-ph]; • Kinematic triangle-singularity • F.K.Guo, Ulf-G.Meißner, W.Wang, Z.Yang, arXiv:1507.04950 [hep-ph] • X.H.Liu, Q.Wang, Q.Zhao,  arXiv:1507.05359 [hep-ph]

  20. 4. Conclusions • Hadron spectroscopy reveals unquenched quark picture • Superheavy narrow N* and L* are predicted to exist • `D(*)Sc,`Ds (*) Lc  BSb,BsLb bound states • ~ 4.3 GeV ~11 GeV • and partly confirmed by LHCb experiment • Distinguishable predictions for penta-quark spectroscopy • are yelling for further experimental confirmation • New penta-quark spectroscopy provides a new idea platform • for understanding multiquark dynamics • They can be looked for at 12GeV@Jlab and • maybe also at JPARC, super-B, RHIC , EIC?

  21. Thanks !

  22. S* in PDG S(1189)1/2+ S*(1385)3/2+ S*(1670)3/2- S*(1775)5/2-S*(1915)5/2+S*(2030)7/2+ **** S*(1660)1/2+ S*(1750)1/2- S*(1940)3/2-S*(2250)?? *** S*(1690)?? S*(1880)1/2+ S*(2080)3/2+S*(2455)?? S*(2620)?? ** S*(1480)?? S*(1560)?? S*(1580)3/2-S*(1620)1/2- S*(1770)1/2+S*(1840)3/2+S*(2000)3/2-S*(2070)5/2+S*(2100)7/2-S*(3000)?? S*(3170)?? * All from old experiments of 1970-1985 !! No established 1/2-S* , X*, W* !

  23. `du `bb states ? Belle Collaboration, PRL108 (2012) 122001  Zb(10610), Zb (10650) “Observation of Two Charged Bottomoniumlike Resonances in U(5S) Decays” important to confirm them and find their partners

  24. Zc(3900) production from Y(4260) decays a `du `cc states ? Y(4260) Q.Wang,C.Hanhart,Q.Zhao PRL111(2013)132003 D.Y.Chen, X.Liu, PRD84(2011)034032

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