Heavy quark exotica and heavy quark symmetry EIC workshop@Weihai Heavy quark exotica and heavy quark symmetry Yan-Rui Liu (刘言锐) Shandong University, China Jul. 29, 2013

Content Heavy quark mesons Heavy quark symmetry Predictions EIC workshop@Weihai Content Heavy quark mesons Heavy quark symmetry Predictions Summary and perspective

Quark model and hadrons EIC workshop@Weihai Quark model and hadrons Heavy quark hadrons

Lightest

EIC workshop@Weihai Heavy quark hadrons

Heavy quark spectra from EIC workshop@Weihai Heavy quark spectra from Belle, Babar, CDF, SELEX, LHCb, BESIII, ... Future: Higgs-factory, Z-factory, STCF, EIC?

EIC workshop@Weihai Exotic -like mesons PDG12

EIC workshop@Weihai Above DD threshold Near threshold, coupled channel effects Difficult to understand in QM

Exotic -like mesons Easier to produce than , ... A deuteron-like EIC workshop@Weihai Exotic -like mesons Easier to produce than , ... A deuteron-like molecule?

Exotic -like mesons BESIII:  + X(3872)  + charged states EIC workshop@Weihai Exotic -like mesons BESIII:  + X(3872)  + charged states

Charged exotic mesons Zb(10610), Zb(10650): EIC workshop@Weihai Charged exotic mesons Zb(10610), Zb(10650): PRL 108, 122001 (2012) [Belle]

C.Z. Yuan’s talk@

C.Z. Yuan’s talk@

Exotic mesons: interpretations EIC workshop@Weihai Exotic mesons: interpretations Molecule or tetraquark? e.g. Y(4260) & Z(3900)  Hybrids? Cusp? Threshold effect? Coupled channel effects? ...

Y(4260) & Zc(3900) EIC workshop@Weihai Q. Wang, C. Hanhart, Q. Zhao, 1303.6355 D.Y. Chen, X. Liu, T. Matsuki, 1304.5845

EIC workshop@Weihai

QCD and heavy quark symmetry EIC workshop@Weihai QCD and heavy quark symmetry QCD: hadrons u < d < s < c < b < t mq0, chiral symmetry, K mQ, heavy quark symmetry (HQS) :Simple but important , need more studies

EIC workshop@Weihai Heavy quark symmetry For a heavy quark Q interacting with light degrees of freedom, such as light quarks and gluons Strong interactions: (1) flavor blind  HQ flavor symmetry (HQFS) (2) heavy quark spin orientation blind  HQ spin symmetry (HQSS)

EIC workshop@Weihai Heavy quark symmetry HQFS HQSS

Heavy quark symmetry (Multiplet structure) EIC workshop@Weihai Heavy quark symmetry (Multiplet structure) both conserved

Heavy quark symmetry (Multiplet structure) EIC workshop@Weihai Heavy quark symmetry (Multiplet structure)

Heavy quark symmetry (Multiplet structure) EIC workshop@Weihai Heavy quark symmetry (Multiplet structure) Q-hadron ?

HQSS constraints For interactions: EFT HQSS  EIC workshop@Weihai HQSS constraints For interactions: EFT HQSS  For molecule decays: spin selection rules For molecule production in annihilation: total angular momentum of light degree of freedom should be 0 ... T.M. Yan et a l., prd46,1148 (1992)

HQS selection rules in meson-antimeson structure EIC workshop@Weihai HQS selection rules in meson-antimeson structure M.B. Voloshin, PLB 604,69; Y.R. Liu, 1304.7467

EIC workshop@Weihai HQS selection rules Two selection rules for in S-wave meson-antimeson states in HQ limit: (a) (b) if (A,B) is a doublet Same rules for S-wave baryon-antibaryon states with the exception for two singlet baryons where Heavy quark limit: conserved in strong decays of hadron-antihadron states

HQS selection rules EIC workshop@Weihai X(3872) Not observed Zc(3900) Not observed If no, maybe a tetraquark

HQS selection rules If Y(3940) is a molecule, c channelJ=0 or 2. EIC workshop@Weihai HQS selection rules If Y(3940) is a molecule, c channelJ=0 or 2. A charged state in J/?  J=1 A charged state in J/?  c: J=0 or 2

HQS selection rules J=1: J=2: J=3: EIC workshop@Weihai cf. Probability for spin(cc)=0 in DD1 is 1/8

HQS in molecule production EIC workshop@Weihai HQS in molecule production X. Li, M.B. Voloshin, 1307.1072 Heavy quark spin symmetry  Y(4260) as a molecule is not supported How large is the HQSS violation in decay and production?

Predictions of new exotica EIC workshop@Weihai Predictions of new exotica Tornqvist’s predictions in Z. Phys. C 61, 525 (1994) One-pion exchange approach including tensor force

Predictions of new exotica EIC workshop@Weihai Predictions of new exotica More meson-antimeson molecules are possible: H-H, H-S, ...

Predictions of new exotica EIC workshop@Weihai Predictions of new exotica X3 rearrangement decays to : J=1,2,3, P=-, C= Z3, Z2, Z1; X3, X2, X1 For C=+ case, attraction strong for X3 state HQSS Around the threshold, the J/ channel may be used to identify X3 with

The similarity between Y(4360) and Y(4260) 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 @ STCF: ISPE mechanism

More on heavy quark hadrons EIC workshop@Weihai More on heavy quark hadrons Tcc: tetraquark with quark content (ccqq) cc, cN, cc, ... Hidden charm N*: mass > 4200 MeV NOT excited nucleon: exotic property [Wu, Molina, Oset, Zou, PRL 105, 232001 (2010)] Anomalous line shape in ...

Summary and perspective EIC workshop@Weihai Summary and perspective Lots of unexpected observations have been made More interesting phenomena above DD threshold are expected Heavy quark (spin) symmetry plays an important role in understanding heavy quark exotica and might lead to more findings Need more information from experiments: Higgs-factory, Z-factory, STCF and/or EIC? Thank you!