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Transcript of Charged bottomonium-like states Z b (10610) and Z b (10650) Xiang Liu [email protected] Lanzhou...
![Page 1: 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.](https://reader031.fdocuments.us/reader031/viewer/2022013105/551b868d550346167e8b4d0f/html5/thumbnails/1.jpg)
Charged bottomonium-like statCharged bottomonium-like states Zes Zbb(10610) and Z(10610) and Zbb(10650) (10650)
Xiang LiuXiang [email protected]
Lanzhou UniversityLanzhou University
·
The Fifth Asia-Pacific Conference on Few-Body Problems in Physics
22-26 August 2011, Seoul, Republic of Korea
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Xiang Liu @ LZU 2
OutlineOutline
• ExperimentExperiment ZZbb(10610)(10610) and and ZZbb(10650)(10650)• Dipion hidden-bottom decays of Y(5S)Dipion hidden-bottom decays of Y(5S)
New puzzle!New puzzle!• Theorecital explanations—exotic structuresTheorecital explanations—exotic structures• Initial Single Pion Emission (ISPE) mechanismInitial Single Pion Emission (ISPE) mechanism• More predictionsMore predictions• SummarySummary
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Xiang Liu @ LZU 3
Charmonium-like states XYZCharmonium-like states XYZ
In the past seven years, experiments reported many charmonium-like In the past seven years, experiments reported many charmonium-like states X,Y, Z. states X,Y, Z. BaBar+Belle+CLEO+CDFBaBar+Belle+CLEO+CDF Stimulate theorist’s interest in revealying their underlying structures.Stimulate theorist’s interest in revealying their underlying structures. Hot topic in hadron physics at presentHot topic in hadron physics at present..
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Xiang Liu @ LZU 4
Experiment status of two charged ZbExperiment status of two charged Zb
Belle CollaborationBelle Collaboration
arXiv:1105.4583arXiv:1105.4583
ZZbb(10610)(10610)
ZZbb(10650)(10650)
![Page 5: 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.](https://reader031.fdocuments.us/reader031/viewer/2022013105/551b868d550346167e8b4d0f/html5/thumbnails/5.jpg)
Xiang Liu @ LZU 5
Charged bottomonium-like structuresCharged bottomonium-like structures
Close to the B*B or B*B* thresholdClose to the B*B or B*B* threshold
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Xiang Liu @ LZU 6
Dipion hidden-bottom decays of Y(5S)Dipion hidden-bottom decays of Y(5S) A. BONDAR Talk in FPCP2011A. BONDAR Talk in FPCP2011
Meng&Chao, PRD77, 074003 (2008)
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Xiang Liu @ LZU 7
Ali et al., PRL104, 162001Ali et al., PRL104, 162001
Tetraquark explanation to Y(10870)Tetraquark explanation to Y(10870)
Chen, He, Li,Chen, He, Li, Xiang Liu, Xiang Liu, arXiv:arXiv: 1105.16721105.1672
Indicate the Indicate the mistake in mistake in Ali’s workAli’s work
Propose Propose interference interference
effecteffect
New New puzzle!puzzle!
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Xiang Liu @ LZU 8
Zb structues and New PuzzleZb structues and New Puzzle
Chen, Chen, Xiang LiuXiang Liu, Zhu,, Zhu, arXiv:arXiv: 1105.51931105.5193
Two newly observed Two newly observed ZZbb structure structuress play play important roleimportant role to solve “ to solve “NNew puzzleew puzzle” in ” in Y(5S)Y(5S)Y(2S)Y(2S)ππ++ππ- -
decaydecay
Question:Question: what iswhat is the source the source to generateto generate Zb(10610) Zb(10610) andand
Zb(10650)? Zb(10650)?
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Xiang Liu @ LZU 9
• S-wave BB* and B*B* molecular statesS-wave BB* and B*B* molecular states
Liu, Xiang Liu,Deng, Zhu, EPJC56, 63 (2008) Xiang Liu, Luo, Liu, Zhu, EPJC61, 411 (2009)
Bondar, Garmash, Milstein, Mizuk, Voloshin, arXvi:1105.4473Zhang, Huang, arXiv:1105.5472 QCD sum ruleVoloshin, arXiv:1105.5829 Radiative decaysSun, He, Xiang Liu, Luo, Zhu, arXiv:1106.2968, accepted by PRD
One-Boson-exchange model
• Tetraquark stateTetraquark state
Yang, Ping, Deng, Zong, arXiv:1105.5935Guo, Cao, Zhou, Chen, arXiv:1106.2284
Theoretical explanation - exotic strucutesTheoretical explanation - exotic strucutes
![Page 10: 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.](https://reader031.fdocuments.us/reader031/viewer/2022013105/551b868d550346167e8b4d0f/html5/thumbnails/10.jpg)
Xiang Liu @ LZU 10
Sun, He, Xiang Liu, Luo, Zhu, arXiv:1106.2968, accepted by PRD
One-Boson-exchange modelOne-Boson-exchange model
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Xiang Liu @ LZU 11
S-wave and D-wave contributions between B and B* mesons
The effective potential:The effective potential:
Zb(10610Zb(10610)
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Xiang Liu @ LZU 12
Zb(10650Zb(10650)
The effective potential:The effective potential:
S-wave and D-wave interaction between B* S-wave and D-wave interaction between B* and B*and B*
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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* Both Zb(10610) and Zb(10650) can be explained as BB* and B*B* molecular states. and B*B* molecular states.
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Xiang Liu @ LZU 14
Initial Single Pion Emission (ISPE) mechaInitial Single Pion Emission (ISPE) mechanismnism
D.Y. Chen,D.Y. Chen, Xiang Liu Xiang Liu, arXiv:1106.3798 [hep-ph], arXiv:1106.3798 [hep-ph]
First propose a First propose a new decay mechanismnew decay mechanism existing in Y(5S) decayexisting in Y(5S) decay
the ISPE mechanismthe ISPE mechanismThe emitted pion with The emitted pion with continuous enercontinuous energy distributiongy distribution
B* and B* with B* and B* with low momentumlow momentum
EasilyEasily interacte with each other interacte with each other
B*B*B*B*Y(nS)Y(nS)ππ
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Xiang Liu @ LZU 15
B*B*
BB*
BB
Exp
Kitty head!Kitty head!
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Xiang Liu @ LZU 16
BB* BBB*B*
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Xiang Liu @ LZU 17
Chen, Chen, Xiang LiuXiang Liu, Zhu,, Zhu, arXiv:arXiv: 1105.51931105.5193
An underlying mechanism An underlying mechanism without introducing exotic without introducing exotic
explanation!explanation!
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Xiang Liu @ LZU 18
More predictionsMore predictions
If the If the ISPE mechanismISPE mechanism is a is a universaluniversal mechanism in heavy quarkoni mechanism in heavy quarkonium dipion decays, we naturally extend the ISPE mechanism to studum dipion decays, we naturally extend the ISPE mechanism to stud
y the y the hidden-charm dipionhidden-charm dipion decays of decays of higher charmoniahigher charmonia
D.Y. Chen,D.Y. Chen, Xiang Liu Xiang Liu, , Phys.Rev.D84, 034032 (2011)Phys.Rev.D84, 034032 (2011)
Higher charmoniaHigher charmonia
ΨΨ(4040),(4040),ΨΨ(4160),(4160),ΨΨ(4415)(4415)
Charmonium-like stateCharmonium-like state
Y(4260)Y(4260)
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Xiang Liu @ LZU 19
BESIIIBESIII
Belle&BaBarBelle&BaBar
Belle IIBelle II
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Xiang Liu @ LZU 20
CLEO-c, PRL107, 041803 (2011)
D.Y. Chen,D.Y. Chen, Xiang Liu Xiang Liu, , Phys.Rev.D84, 034032 (2011)Phys.Rev.D84, 034032 (2011)
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Xiang Liu @ LZU 21
SummarySummary• Observation of Zb(10610) and Zb(10650) • Exotic structureExotic structure & production mechanismproduction mechanism• Y(5S) Y(5S) dipion hidden-bottomdipion hidden-bottom decays decays• The ISPEISPE mechanism ZZbb(10610) and (10610) and ZZbb(10(10
650)650)• Predict their Predict their charmonium analoguescharmonium analogues Two charged structures close to DD* and D*D* tTwo charged structures close to DD* and D*D* t
hresholds hresholds BESIII Belle BaBar Belle II SuperBBESIII Belle BaBar Belle II SuperB
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Xiang Liu @ LZU 22
Thank you for Thank you for your attention! your attention!