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Theoretical Progress on XYZ States

Theoretical Progress on XYZ States. Dian-Yong Chen. Institute of Modern Physics, CAS. Research Center for Hadron and CSR Physics Lanzhou University & Institute of Modern Physics of CAS. Collaborated with Xiang Liu, Jun He, Shi-Lin Zhu, Xue-Qian Li, T. Matsuki. Outline. Charmonium-like state

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Theoretical Progress on XYZ States

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  1. Theoretical Progress on XYZ States Dian-Yong Chen Institute of Modern Physics, CAS Research Center for Hadron and CSR Physics Lanzhou University & Institute of Modern Physics of CAS Collaborated with Xiang Liu, Jun He, Shi-Lin Zhu, Xue-Qian Li, T. Matsuki

  2. Outline • Charmonium-like state Y(4260) Y(4360) • Y(5S) hidden-bottom dipion decays Zb(10610) Zb(10650) • Summary

  3. Charmonium-like statesY(4260) and Y(4360) Dian-Yong Chen, Jun He and Xiang Liu PRD83, 074012 (2011) PRD83, 054021 (2011)

  4. According to the production mechanism, we can categorize these charmonium-like statesX, Y, Z as four groups: ISR process Y(4260) Y(4008) Y(4360) Y(4630) Y(4660)

  5. PRL95, 142001 (2005) PC -- Spin-parity: J =1 Experimental status of Y(4260) and Y(4360) Y(4260)

  6. PC -- Spin-parity: J =1 Y(4360) PRL98, 212001 (2007) PRL99, 142002 (2007) M=4324±24 MeV Γ=172±33 MeV M=4361±9±9 MeV Γ=74±15±10 MeV

  7. Theoretical explanation Exotic state: Y(4260) • Charmonium hybrid Zhu, Kou&Pene, Close&Page • Diquark-antidiquark state[cs][cs]Maiani&Riquer&Piccinini&Polosa, Ebert& Faustov & Galkin • Molecular state ( ) Liu&Zeng&Li, Yuan&Wang&Mo, Qiao, Ding, Torres&Khemchandani &Gamermann&Oset, Close&Downum&Thomas • Charmonium hybrid state with strong coupling with DD1 and DD0 Kalashnikova &Nefediev The lack of signal in certain channels also poses a serious challenge to a number of the explanations proposed in the framework of an exotic state.

  8. Y(4260) Conventional charmonium： • 4S-3D vector charmonium Llanes-Estrada • 2 D1 state decay behavior  Eichten, Lane, Quigg • Mass spectrum Y(4260) ≠charmonium Segovia, Yasser, Entem, Fernandez • Screened potential Y(4260) =Ψ(4S) Li, Chao 3

  9. Conventional + exotic Y(4360) • 3D charmonium or charmonium hybrid Ding, Li&Chao • The radial excited state of Y(4260) Qiao • Charmed baryonium Cotugno&Faccini&Polosa&Sabelli • The vector hybrid charmonium with strong coupling with D*D0 Kalashnikova&Nefediev • molecular stateAlbuquerque & Nielsen Close&Downum&Thomas

  10. D*D* Y(4260) Y(4008) ψ(4040) PRL98, 092001 (2007) ψ(4160) Y(4360) DD* PRD77,011103(2008) DD ? DDπ PRL100,062001(2008) ψ(4415) arXiv:0908.0231 DD*π New PRL101,172001(2008) Y(4660) Λc+Λc– The main challenge of Y(4260) and Y(4360) as a conventional charmonium: No evidence of Y(4260)/Y(4360) in the obtained open-charm process and R-value scan

  11. Non-resonant explanation for Y(4260) and Y(4360) The interference between Continuum and Resonance

  12. Background Y(4360) Y(4260)

  13. Can we reproduce the line shape of Y(4260) and Y(4360) in our model? Five fitting parameters:

  14. Y(4260) Y(4008) Numerical results for Y(4260) D.Y. Chen, J. He and Xiang Liu, Phys.Rev.D83, 054021 (2011) M=4008±40 MeV Г=226 ±44 MeV Belle, Phys.Rev.Lett.99:182004 (2007)

  15. Numerical results for Y(4360) Dian-Yong Chen, Jun He and Xiang Liu PRD83, 074012 (2011)

  16. Y(5S) hidden-bottom dipion decaysZb(10610) and Zb(10650) Dian-Yong Chen, Jun He, Xun-Qian. Li, Xiang Liu, PRD84, 074006 (2011) Dian-Yong Chen, Xiang Liu, Shi-Lin Zhu, PRD84, 034002 (2011) Dian-Yong Chen, Xiang Liu, PRD84, 094003 (2011) Dian-Yong Chen, Xiang Liu, PRD84, 034032 (2011) Dian-Yong Chen, Xiang Liu, Takayuki. Matsuki, PRD84, 074032 (2011) Dian-Yong Chen, Xiang Liu, Takayuki. Matsuki, preparing

  17. Dipion hidden-bottom decays of Y(5S) Belle, PRL100, 112001 Belle, PRD82, 091106(R) (2010) Decay channel MeV 102 Puzzle existing in Y(5S) dipion hidden-bottom decays

  18. Explanations of anomalous branching ratios of Y(5S) hidden-bottom dipion decays • Rescattering mechanism C. Meng, K.T. Chao PRD77, 074003 (2008) PRD78, 034022 (2008) PRD78, 074001 (2008) Yu. A. Simonov JETP Lett. 87, 147 (2008) H.W. Ke, Xiang Liu, X.Q. Li PRD82, 054030 (2010) • Bottom analogueof Y(4260) s.Godfrey, S.L. Olsen arXiv:0801.3867 • Exoticstructure-Tetraquark state near Y(5S) M. Karliner, H.J. LipkinarXiv:0802.0649 A. Ali et al.PLB684, 28 (2010), PRL104, 162001 (2010)

  19. Ali et al., PRL104, 162001 Chen, He, Li,Liu,PRD84, 074006 (2011) Tetraquark explanation to Y(10870) Indicate the mistake in Ali’s work Propose interference effect New puzzle!

  20. Experiment status of two charged Zb Belle Collaboration arXiv:1105.4583 Zb(10610) Zb(10650)

  21. Chen, Liu, Zhu,PRD84, 054002 (2011) Zb structues and new puzzle Two newly observed Zb structures play important role to solve “new puzzle” in Y(5S)Y(2S)π+π- decay Question:what is the source to generate Zb(10610) and Zb(10650)?

  22. Theoretical explanation I- Exotic strucutes • S-wave BB* and B*B* molecular states Liu, XiangLiu,Deng, Zhu, EPJC56, 63 (2008) Xiang Liu, Luo, Liu, Zhu, EPJC61, 411 (2009) Bondar, Garmash, Milstein, Mizuk, Voloshin, arXvi:1105.4473 Zhang, Huang, arXiv:1105.5472QCD sum rule Voloshin, arXiv:1105.5829Radiative decays Cleven, Guo, Hanhart, Meissner, EPJA, 47, 120 (2011) Sun, He, Xiang Liu, Luo, Zhu,PRD84:054002,2011 One-Boson-Exchange model • Tetraquark state Yang, Ping, Deng, Zong, arXiv:1105.5935 Guo, Cao, Zhou, Chen, arXiv:1106.2284 Predict BB* molecular state

  23. Theoretical explanation II- Mechanism • D. V. Bugg, EPL96, 11002 (2011) Cusp effect • Yu. A. Simonov, arXiv: 1106.1522 • Dian-Yong Chen, Xiang Liu, PRD84, 094003 (2011) • Initial single pion emission (ISPE) mechanism An underlying mechanism without introducing exotic explanation!

  24. BB* Exp BB B*B*

  25. BB* B*B* BB

  26. More predictions Dian-Yong Chen,Xiang Liu, PRD84, 034032 (2011) If the ISPE mechanism is a universal mechanism in heavy quarkonium dipion decays, we naturally extend the ISPE mechanism to study the hidden-charm dipion decays of higher charmonia or higher bottomonia

  27. Dian-Yong Chen, Xiang Liu, Takayuki. Matsuki, PRD84, 074032 (2011) Predictedcharged bottomonium-like structures near BB* and B*B* threshold. Belle II and SuperB

  28. BESIII Belle&BaBar Belle II

  29. Dian-Yong Chen, Xiang Liu, Phys. Rev. D84, 034032 (2011) CLEO-c, PRL107, 041803 (2011)

  30. PRD74,091103(R) (2006) A series in flavor: ISPE Mechanism Bottomonium Charmonium Strangeonium PRL100,102003 (2008) BES-II M=2.186 GeV Γ= 65 MeV M=2.175 GeV Γ= 58 MeV

  31. Similar novel peak structures • K*K : Sharp & Narrow • K*K* : Smooth& Broad • More Experimental • Measurements (BESIII)

  32. Summary • Non-resonant explanation to Y(4260) and Y(4360) • Charged Zb(10610) and Zb(10650) Mechanism：ISPE mechanism Extend to Charmonium, Strangeonium • More effortstheory+experiment Belle-II,BESIII,LHCb, SuperB, PANDA

  33. Thank you ！

  34. A series in flavor: ISPE Mechanism Bottomonium Charmonium Strangeonium 34

  35. PRD74,091103(R) (2006) PRL100,102003 (2008) BES-II M=2.186 GeV Γ= 65 MeV M=2.175 GeV Γ= 58 MeV Summary of Mass of width No Evidence of Y(2175) 35

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