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Charged bottomonium-like states Z b (10610) and Z b (10650)

Charged bottomonium-like states Z b (10610) and Z b (10650). ·. Xiang Liu xiangliu@lzu.edu.cn Lanzhou University. The Fifth Asia-Pacific Conference on Few-Body Problems in Physics 22-26 August 2011, Seoul, Republic of Korea. Outline. Experiment Z b (10610) and Z b (10650)

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Charged bottomonium-like states Z b (10610) and Z b (10650)

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  1. Charged bottomonium-like states Zb(10610) and Zb(10650) · Xiang Liu xiangliu@lzu.edu.cn Lanzhou University The Fifth Asia-Pacific Conference on Few-Body Problems in Physics 22-26 August 2011, Seoul, Republic of Korea

  2. Outline • ExperimentZb(10610) and Zb(10650) • Dipion hidden-bottom decays of Y(5S)  New puzzle! • Theorecital explanations—exotic structures • Initial Single Pion Emission (ISPE) mechanism • More predictions • Summary Xiang Liu @ LZU

  3. Charmonium-like states XYZ • In the past seven years, experiments reported many charmonium-like states X,Y, Z. BaBar+Belle+CLEO+CDF • Stimulate theorist’s interest in revealying their underlying structures. • Hot topic in hadron physics at present. Xiang Liu @ LZU

  4. Experiment status of two charged Zb Belle Collaboration arXiv:1105.4583 Zb(10610) Zb(10650) Xiang Liu @ LZU

  5. Charged bottomonium-like structures • Close to the B*B or B*B* threshold Xiang Liu @ LZU

  6. Dipion hidden-bottom decays of Y(5S) A. BONDAR Talk in FPCP2011 Meng&Chao, PRD77, 074003 (2008) Xiang Liu @ LZU

  7. Ali et al., PRL104, 162001 Chen, He, Li, Xiang Liu, arXiv:1105.1672 Tetraquark explanation to Y(10870) Indicate the mistake in Ali’s work Propose interference effect New puzzle! Xiang Liu @ LZU

  8. Chen, Xiang Liu, Zhu,arXiv:1105.5193 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)? Xiang Liu @ LZU

  9. Theoretical explanation - 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:1105.5472 QCD sum rule Voloshin, arXiv:1105.5829 Radiative decays Sun, He, Xiang Liu, Luo, Zhu, arXiv:1106.2968, accepted by PRD One-Boson-exchange model • Tetraquark state Yang, Ping, Deng, Zong, arXiv:1105.5935 Guo, Cao, Zhou, Chen, arXiv:1106.2284 Xiang Liu @ LZU

  10. Sun, He, Xiang Liu, Luo, Zhu, arXiv:1106.2968, accepted by PRD One-Boson-exchange model Xiang Liu @ LZU

  11. The effective potential: Zb(10610) S-wave and D-wave contributions between B and B* mesons Xiang Liu @ LZU

  12. The effective potential: Zb(10650) S-wave and D-wave interaction between B* and B* Xiang Liu @ LZU

  13. Sun, He, Xiang Liu, Luo, Zhu, arXiv:1106.2968, accepted by PRD Both Zb(10610) and Zb(10650) can be explained as BB* and B*B* molecular states. Xiang Liu @ LZU

  14. First propose a new decay mechanism existing in Y(5S) decay the ISPE mechanism The emitted pion with continuous energy distribution B* and B* with low momentum Easily interacte with each other B*B*Y(nS)π Initial Single Pion Emission (ISPE) mechanism D.Y. Chen, Xiang Liu, arXiv:1106.3798 [hep-ph] Xiang Liu @ LZU

  15. Kitty head! BB* Exp BB B*B* Xiang Liu @ LZU

  16. BB* B*B* BB Xiang Liu @ LZU

  17. Chen, Xiang Liu, Zhu,arXiv:1105.5193 An underlying mechanism without introducing exotic explanation! Xiang Liu @ LZU

  18. More predictions D.Y. Chen, Xiang Liu, Phys.Rev.D84, 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 Higher charmonia Ψ(4040),Ψ(4160),Ψ(4415) Charmonium-like state Y(4260) Xiang Liu @ LZU

  19. BESIII Belle&BaBar Belle II Xiang Liu @ LZU

  20. D.Y. Chen, Xiang Liu, Phys.Rev.D84, 034032 (2011) CLEO-c, PRL107, 041803 (2011) Xiang Liu @ LZU

  21. Summary • Observation of Zb(10610) and Zb(10650) • Exotic structure & production mechanism • Y(5S) dipion hidden-bottom decays • The ISPE mechanism Zb(10610) and Zb(10650) • Predict their charmonium analogues Two charged structures close to DD* and D*D* thresholds BESIII Belle BaBar Belle II SuperB Xiang Liu @ LZU

  22. Thank you for your attention! Xiang Liu @ LZU

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