the prediction of charged charmoniumlike structures with the hidden-charm and open-strange

The prediction of charged charmoniumlike structures with

the hidden-charm and open-strange

刘 翔刘 翔兰州大学兰州大学

2013 年 6 月 27 日中国科学技术大学交叉学科理论研究中心

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OutlineOutline

• Zc(3900) observed by BESIIIZc(3900) observed by BESIII• The lessons from studying The lessons from studying the hidden-the hidden-

bottom decays of Y(5S)bottom decays of Y(5S)

ISPE mechanismISPE mechanism

• Novel charged structures Novel charged structures existing in the existing in the hidden-charm dikaon decays of hidden-charm dikaon decays of higher higher charmonia charmonia or or charmonium-like statescharmonium-like states

• SummarySummary

Xiang Liu @ LZU 2

Zc(3900) observed by BESIIIZc(3900) observed by BESIII

Xiang Liu @ LZU 3

BESIII, PRL 110, 252001 (2013)

A charged charmonium-like structure

Near the threshold

Zc(3900) confirmed by BelleZc(3900) confirmed by Belle

Xiang Liu @ LZU 4

BESIII, PRL 110, 252002 (2013)

Belle confirmed the BESIII observation of Zc(3900)!

Xiang Liu @ LZU 5

CLEO-c, arXiv: 1304.3036CLEO-c, arXiv: 1304.3036

CLEO-c also released their result of searching for Zc(3900)

Exotic state?Exotic state?

• Abundant observations of charmonium-like states XYZ in the past decade

BaBar, Belle, CLEO, CDF, CMS, LHCbBaBar, Belle, CLEO, CDF, CMS, LHCb• Four different production mechanisms• QCD strong interaction (nonperturbative QCD effectnonperturbative QCD effect)

Charmonium-like states XYZCharmonium-like states XYZ

Zc(3900) makes the spectrum of XYZ become more abundant New process different former four production mechanisms

Xiang Liu @ LZU 7

The lessons from studying The lessons from studying the hidden-bottom decays the hidden-bottom decays

of Y(5S)of Y(5S)

ExperimentExperiment

Xiang Liu @ LZU 8

Belle CollaborationBelle Collaboration

arXiv:1105.4583arXiv:1105.4583

Charged bottomonium-like structuresCharged bottomonium-like structures

Close to the and thresholdClose to the and thresholdXiang Liu @ LZU 9

Dipion hidden-bottom decays of Y(5S)Dipion hidden-bottom decays of Y(5S)

Xiang Liu @ LZU 10

Puzzles of Y(5S) decays

Anomalous production of Y(ns) π+π- with 21.7 fb-1

PRL100, 112001 (2008)

Y(5S)Y(1S) π+π- 0.59±0.04±0.09

Y(5S)Y(2S) π+π- 0.85±0.07±0.16

Y(5S)Y(3S) π+π- 0.52

Y(2S)Y(1S) π+π- 0.0060

Y(3S)Y(1S) π+π- 0.0009

Y(4S)Y(1S) π+π- 0.0019

102

PRD82, 091106R (2011)Γ (MeV)

Rescattering mechnism Meng, Chao, PRD77, 074003 (2008) Tetraquakr state Yb near Y(5S) Ali et. al., PLB684, 28-39 (2010)

Xiang Liu @ LZU 11

Ali et al., PRL104, 162001Ali et al., PRL104, 162001

Tetraquark explanation to Y(10870)Tetraquark explanation to Y(10870)

Chen, He, Li, Xiang Liu, Phys.Rev.D84:074006,2011

Indicate the Indicate the mistake in mistake in Ali’s workAli’s work

Propose Propose interference interference

effecteffect

New New puzzle!puzzle!

Zb structues and New PuzzleZb structues and New Puzzle

Xiang Liu @ LZU 12

Chen, Xiang Liu, Zhu, PRD84, 074016 (2011)

Two newly observed Two newly observed ZZbb structuresstructures play play important roleimportant role to to

solve “solve “New puzzleNew 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)?

Exotic states? Exotic states?

Xiang Liu @ LZU 13

Can we find other mechanisms to explain Can we find other mechanisms to explain it?it?Can we find other mechanisms to explain Can we find other mechanisms to explain it?it?

BB* and B*B* molecular statesTetraquark states

Charged bottomonium-like structuresCharged bottomonium-like structures

Close to the D*D and D*D* thresholdClose to the D*D and D*D* threshold

Cusp effect from BB* and B*B* Cusp effect from BB* and B*B* thresholdsthresholds

Bugg, Europhys. Lett.96:11002, 2011

Initial Single Pion Emission (ISPE) Initial Single Pion Emission (ISPE) mechanismmechanism

Xiang Liu @ LZU 14

D.Y. Chen, Xiang Liu, Phys.Rev.D84:094003,2011

First propose a First propose a new decay new decay mechanismmechanism existing in Y(5S) decay existing in Y(5S) decay

the ISPE mechanismthe ISPE mechanismThe emitted pion with The emitted pion with continuous continuous energy distributionenergy 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

Xiang Liu @ LZU 15

B*B*

BB*

BB

Exp

Kitty head!Kitty head!

Xiang Liu @ LZU 16

BB* BBB*B*

D.Y. Chen, Xiang Liu, Phys.Rev.D84:094003,2011

Xiang Liu @ LZU 17

Chen, Xiang Liu, Zhu, PRD84, 074016 (2011)

A underlying mechanism A underlying mechanism without introducing exotic without introducing exotic

explanation!explanation!

Explain why the charged structures near BB* and B*B* thresholds can be found in the hidden-charm dipion decays of Y(5S)

We cannot find the sharp peak close to the BB threshold

Xiang Liu @ LZU 18

Motivation:Motivation:

If the If the ISPE mechanismISPE mechanism is an is an universaluniversal mechanism in mechanism in heavy quarkonium dipion decays, we naturally heavy quarkonium dipion decays, we naturally extend the ISPE mechanism to study the extend the ISPE mechanism to study the hidden-hidden-charm dipioncharm dipion decays of decays of higher charmoniahigher charmonia

• The similaritysimilarity between charmonium and bottomonium

• Give predictionspredictions for future experiment• An important test to the ISPE mechanism An important test to the ISPE mechanism

• The similaritysimilarity between charmonium and bottomonium

• Give predictionspredictions for future experiment• An important test to the ISPE mechanism An important test to the ISPE mechanism

Novel charged structures Novel charged structures existing in the hidden-charm dipion decays of existing in the hidden-charm dipion decays of

higher charmonia or charmonium-like stateshigher charmonia or charmonium-like states

Xiang Liu @ LZU 19

D.Y. Chen, Xiang Liu, Phys.Rev.D84:094003,2011

Higher charmoniaHigher charmonia

ΨΨ(4040),(4040),ΨΨ(4160),(4160),ΨΨ(4415)(4415)

Charmonium-like stateCharmonium-like state

Y(4260), Y(4360)Y(4260), Y(4360)

ISPE mechanismISPE mechanism

Xiang Liu @ LZU 20

D.Y. Chen, Xiang Liu, Phys.Rev.D84:094003,2011

Predict the charged charmonium-like structures near the and thresholds.

CLEO-c, PRL107, 041803 (2011)

D.Y. Chen, Xiang Liu, Phys. Rev. D84, 034032 (2011)

Xiang Liu @ LZU 21

The Belle Collaboration, Chang-Zheng Yuan’s talk given in “Hadron Structure and interactionin 2011”

Xiang Liu @ LZU 22

D.Y. Chen, Xiang Liu

Phys. Rev. D84, 034032 (2011)

BESIII’s experimental BESIII’s experimental paper paper mentioned mentioned our our

theoretical predictions theoretical predictions of charged charmonim-of charged charmonim-

like structureslike structures

BESIII, PRL 110, 252001 (2013)

Xiang Liu @ LZU 24

D.Y. Chen, Xiang Liu, T. Matsuki, arXiv:1304.5845

Reproduce Zc(3900) via the ISPE mechanism

Xiang Liu @ LZU 25

D.Y. Chen, Xiang Liu, T. Matsuki, arXiv:1306.2080

The similarity between Y(4360) and Y(4260)Novel charged charmoniumlike structures in the hidden-charm

dipion decays of Y(4360)

Xiang Liu @ LZU 26

ISChE mechanism andISChE mechanism andthe predicted charged the predicted charged

charmoniumlike structures with the charmoniumlike structures with the hidden-charm and open-strangehidden-charm and open-strange

D.Y. Chen, Xiang Liu and T. MatsukiPhys.Rev.Lett. 110 (2013) 232001

Xiang Liu @ LZU 27

The initial single chiral particle emission The initial single chiral particle emission (ISChE) mechanism(ISChE) mechanism

ISChE mechanism is an important extension of ISPE mechnism

proposed by us

D.Y. Chen, Xiang Liu and T. Matsuki, Phys.Rev.Lett. 110 (2013) 232001

Both the pion and kaon canbe categorized as chiral chiral

particlesparticles.

The hidden-charm dikaon decays of a higher charmonium are intriguing processes

The initial single chiral particle emission (ISChE) mechanism can play an important role in these decays

Xiang Liu @ LZU 28

Via ISChE mechanism, we study these processes:

These processes satisfy

Belle, PRL99, 142002 (2007)

EPL85, 61002 (2009)

We will answer the question of whether there exist charged charmoniumlike structurescharged charmoniumlike structures with both of

hidden-charm and open-strange channels.

Xiang Liu @ LZU 29

Effective Lagrangian approach is adopted to write out the decay amplitude

Effective LagrangiansEffective Lagrangians the heavy quark limit + chiral symmetry

Xiang Liu @ LZU 30

Decay amplitude:

Monoploe form factor

Xiang Liu @ LZU 31

A general expression of the differential decay width

Xiang Liu @ LZU 32

Our result indicates:

No charged charmonium-like structure with hidden-charm and hidden-strange, which is near the DsD threshold can be found.

The predicted charged charmoniumlike The predicted charged charmoniumlike structures with the hidden-charm and open-structures with the hidden-charm and open-

strangestrange

D.Y. Chen, Xiang Liu and T. Matsuki, Phys.Rev.Lett. 110 (2013) 232001

Xiang Liu @ LZU 33

There exist enhancement structures with both hidden-charm and open-strange.

These predicted charged charmonium-like structures can be accessible at future experiment, especially BESIII, BelleII and SuperB.

D.Y. Chen, Xiang Liu and T. Matsuki, Phys.Rev.Lett. 110 (2013) 232001

SummarySummary

• Charmonium-like states XYZ Hot research topic • ISPE mechanism

Predict abundant phenomena of charged charmonium-like structures

• Accessible at Accessible at BESIIIBESIII, Belle, BelleII, SuperB, Belle, BelleII, SuperB

The BESIII’s observation The BESIII’s observation Zc(3900)Zc(3900)

Good opportunity and platform!Good opportunity and platform!

Xiang Liu @ LZU 34

Thank you Thank you for your attention!for your attention!

Xiang Liu @ LZU 35