1. 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

2. 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
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3. KEK, Hadron physics at J-PARC, Japan
a, Introduction
Potential models worked well for charmonium specrtoscopy
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4. X, Y, Z states from Brambilla et al., 1010.5827 4 4

5. 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
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6. KEK, Hadron physics at J-PARC, Japan
2018/6/11
KEK, Hadron physics at J-PARC, Japan

7. 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
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KEK, Hadron physics at J-PARC, Japan

8. 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)
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9. KEK, Hadron physics at J-PARC, Japan
2018/6/11
KEK, Hadron physics at J-PARC, Japan

10. 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
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11. Example: New resonances: X(3872) (meson)
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12. ICTP-SAIFR, Sao Paulo, Feb., 2015
Decay modes of X(3872)
ICTP-SAIFR, Sao Paulo, Feb., 2015 12

13. Calculation: Molecular scenario KEK, Hadron physics at J-PARC, Japan
2018/6/11
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14. Effective Lagrangians KEK, Hadron physics at J-PARC, Japan
Non-local ones
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15. Radiative decays Strong decay(two-body, three-body)
Decay width (keV)
PRD77,
PRD79,
Strong decay(two-body, three-body)
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16. KEK, Hadron physics at J-PARC, Japan
New measurement
LHCb:
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17. KEK, Hadron physics at J-PARC, Japan
Results
JPG38,
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18. KEK, Hadron physics at J-PARC, Japan
Some resonances
X(3872), neutral
Zc(3900)+ , Y(4260)
Zb(10610), Z ‘b (10650)
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19. c, New baryon resonance of c(2940)
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20. KEK, Hadron physics at J-PARC, Japan
Measurement
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21. 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*
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22. The assignment of this resonance KEK, Hadron physics at J-PARC, Japan
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23. Effective Lagrangians KEK, Hadron physics at J-PARC, Japan
PRD81,
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24. KEK, Hadron physics at J-PARC, Japan
Calculated results
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25. KEK, Hadron physics at J-PARC, Japan
Radiative decay(1+/2)
PRD81,
Gauge Invariance
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26. KEK, Hadron physics at J-PARC, Japan
Three-body decay
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PRD83, 26

27. KEK, Hadron physics at J-PARC, Japan
d, PANDA .
BEPC, BABAR, BELLE, JLab. PANDA
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28. KEK, Hadron physics at J-PARC, Japan
Production
PRD90,
1+/2
1-/2
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29. Initial state interaction KEK, Hadron physics at J-PARC, Japan
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30. KEK, Hadron physics at J-PARC, Japan
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31. KEK, Hadron physics at J-PARC, Japan
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32. 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!
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