Institute of High Energy physics KEK, Hadron physics at J-PARC, Japan A study of exotic heavy baryons Yubing Dong (董宇兵) Institute of High Energy physics 2018/6/11 KEK, Hadron physics at J-PARC, Japan

KEK, Hadron physics at J-PARC, Japan Contents a Introduction: Exotic resonances Molecule scenario and exotic mesons New exotic baryon resonance of c(2940) Its production Summary..(JPARC) b c d e 2018/6/11 KEK, Hadron physics at J-PARC, Japan

KEK, Hadron physics at J-PARC, Japan a, Introduction Potential models worked well for charmonium specrtoscopy 2018/6/11 KEK, Hadron physics at J-PARC, Japan

X, Y, Z states from Brambilla et al., 1010.5827 11.06.2018 4 4

Close to DD* threshold Charged charmonium spectrum -- A completely new scenario of strong QCD! States close to open thresholds -- The role played by open D meson channels? Close to DD* threshold 2018/6/11 KEK, Hadron physics at J-PARC, Japan

KEK, Hadron physics at J-PARC, Japan 2018/6/11 KEK, Hadron physics at J-PARC, Japan

KEK, Hadron physics at J-PARC, Japan Molecule, baryonium tetraquark Hybrids Coupling channel… Frame Works: Interpretations: QCD sum rule Non relativistic QCD Heavy hadron chiral perturbation theory Lattice calculations Potential models Heavy quark effective theory 2018/6/11 KEK, Hadron physics at J-PARC, Japan

KEK, Hadron physics at J-PARC, Japan Hadronic molecules Weekly bound state of two or three hadrons Obvious examples: Nuclei (deuteron) or hyper-nucleon Baryon-baryon bound state: MH <M1 + M2 Dynamical Generation of molecular bound states/ resonances Long-range one-pion exchange (Tornqvist, 1991) Meson-exchange models (Lohse, et al., 1990) Unitarized coupled channel models with chiral Lagrangians ( Olier, et al., 1997; Jido et al., 2005, Gammermann et al., 08) KEK, Hadron physics at J-PARC, Japan 2018/6/11 8 8

KEK, Hadron physics at J-PARC, Japan 2018/6/11 KEK, Hadron physics at J-PARC, Japan

b, Molecule scenario: X(3872) Bound state description of hadronic molecule on QFT based on the Compositeness condition: ZM=0 (See Weinberg: PR130 (1966),776; Salam, Nuov. Cim. 25 (1962),224…) Mass operator 11.06.2018 KEK, Hadron physics at J-PARC, Japan 10

Example: New resonances: X(3872) (meson) 2018/6/11 KEK, Hadron physics at J-PARC, Japan 11

ICTP-SAIFR, Sao Paulo, Feb., 2015 Decay modes of X(3872) 11.06.2018 ICTP-SAIFR, Sao Paulo, Feb., 2015 12

Calculation: Molecular scenario KEK, Hadron physics at J-PARC, Japan 2018/6/11 KEK, Hadron physics at J-PARC, Japan 13

Effective Lagrangians KEK, Hadron physics at J-PARC, Japan Non-local ones 2018/6/11 KEK, Hadron physics at J-PARC, Japan 14

Radiative decays Strong decay(two-body, three-body) Decay width (keV) PRD77, 094013 PRD79, 094013 Strong decay(two-body, three-body) 2018/6/11 KEK, Hadron physics at J-PARC, Japan 15

KEK, Hadron physics at J-PARC, Japan New measurement LHCb:1409.6472 2018/6/11 KEK, Hadron physics at J-PARC, Japan 16

KEK, Hadron physics at J-PARC, Japan Results JPG38, 015001 2018/6/11 2014-07-13 KEK, Hadron physics at J-PARC, Japan 17

KEK, Hadron physics at J-PARC, Japan Some resonances X(3872), neutral Zc(3900)+ , Y(4260) Zb(10610), Z ‘b (10650) 2018/6/11 KEK, Hadron physics at J-PARC, Japan

c, New baryon resonance of c(2940) 2018/6/11 KEK, Hadron physics at J-PARC, Japan 19

KEK, Hadron physics at J-PARC, Japan Measurement 2018/6/11 KEK, Hadron physics at J-PARC, Japan 20

Different interpretations KEK, Hadron physics at J-PARC, Japan 1), quark model: Isgur-Karl (3/2+,5/2-) Heavy-light diquark model (radial excitation of c(2286)) 2), Chiral quark model: D-Wave 3), Molecular Model near threshold of pD* 2018/6/11 KEK, Hadron physics at J-PARC, Japan 21

The assignment of this resonance KEK, Hadron physics at J-PARC, Japan 2018/6/11 KEK, Hadron physics at J-PARC, Japan 22

Effective Lagrangians KEK, Hadron physics at J-PARC, Japan PRD81, 014006 2018/6/11 KEK, Hadron physics at J-PARC, Japan 23

KEK, Hadron physics at J-PARC, Japan Calculated results 2018/6/11 KEK, Hadron physics at J-PARC, Japan 24

KEK, Hadron physics at J-PARC, Japan Radiative decay(1+/2) PRD81, 034035 Gauge Invariance 2018/6/11 KEK, Hadron physics at J-PARC, Japan 25

KEK, Hadron physics at J-PARC, Japan Three-body decay 2018/6/11 KEK, Hadron physics at J-PARC, Japan PRD83, 094005 26

KEK, Hadron physics at J-PARC, Japan d, Production @ PANDA . BEPC, BABAR, BELLE, JLab. PANDA 2018/6/11 KEK, Hadron physics at J-PARC, Japan

KEK, Hadron physics at J-PARC, Japan Production PRD90, 094001 1+/2 1-/2 2018/6/11 KEK, Hadron physics at J-PARC, Japan

Initial state interaction KEK, Hadron physics at J-PARC, Japan 2018/6/11 KEK, Hadron physics at J-PARC, Japan

KEK, Hadron physics at J-PARC, Japan 2018/6/11 KEK, Hadron physics at J-PARC, Japan

KEK, Hadron physics at J-PARC, Japan 2018/6/11 KEK, Hadron physics at J-PARC, Japan

KEK, Hadron physics at J-PARC, Japan e, Summary 1), Hadronic molecules: old expectations- renewed interest in heavy mesons 2), Effective approach is applied to the states (Compositeness) 3), Hadronic loop is considered 4), Production at PANDA 5), 6), J-PARC Thanks! 2018/6/11 KEK, Hadron physics at J-PARC, Japan 32