Description of Heavy Exotic Resonances
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1 Description of Heavy Exotic Resonances Yubing Dong Institute of High Energy physics, Chinese Academy of Sciences Collaborators: Amand Faessler, Thomas Gutsche, V. E. Lyubovitskij (Tuebingen, Germany) Jujun Xie and Xu Cao (Lanzhou, CAS) 1
2 Contents 1 2 A Brief Introduction (multi-quark states): Our approach: New resonances (I): X(3872) 3 New exotic resonances (II) Λ+c(2940) 4 5 Λ+c(2940) PANDA & JPARC Summary 2
3 1, Introduction (multi-quark) Potential models worked well for charmonium spectroscopy Courtesy of C. Z.Yuan 3
4 (New resonances, five-quark) (2940) + Λc Five-quark * * * * cd, cd, cd, cd, pχc 1 Σ Σ Σ Σ + p 3 /2, 5 /2( J?) P(4380), P '(4449) c c 4
5 d*(2380), six-quark (light quarks) 5
6 approaches/descriptions QCD sum rule Non relativistic QCD Heavy quark effective theory Heavy hadron chiral perturbation theory Potential models Lattice calculations Molecule, baryonium tetraquark Hybrids Coupling channel 6
7 Hadronic molecules Weekly bound state of two or three hadrons Typical examples: Nuclei and hyper-nuclei Baryon-baryon bound state: MH <M1 + M2 The Molecule idea has a long history Voloshin, Okun (1976) De Rujula, George, and Glashow (1977) Long-range one-pion exchange (Tornqvist, ZPC1993) 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)+ Chinese+ 7
8 2 Π( p ) 2, Our approach: Molecule scenario The mass operator represented by D 2 Π( p ) X X (3872) D* Correlation function Two fields 8
9 Compositeness condition: Bound state description of hadronic molecules in QFT based on compositeness condition: Weinberg,PR1963;Salam, Nuov.Cim Heyashi et al.,fortsch. Phys The coupling g is determined by the condition g g 9
10 Vertex function Characterize the finite size of the hadron the distributions in the hadron Gaussian-type is chosen for the function Parameter: Gaussian with free size parameter Λ Four-dimensional covariant calculation 10
11 New resonance(1): X(3872) 11
12 Decay modes 12
13 Radiative decays Decay width (kev) PRD77, ,
14 Strong decay (two-body, three-body)
15 Strong decay (two-body, three-body) 15
16 New measurement of LHCb LHCb
17 Including of cc YBD, Faessler, Gutsche & Lyubovitskij, J. Phys. G38,
18 Results (including cc ) YBD, Faessler, Gutsche & Lyubovitskij, J. Phys. G38, Interference effect, by the admixture θ, plays crucial role to understand the measured ratio BABAR LHCb 18
19 Brief summary (1) 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), Decay modes: some c\bar{c} +dominate hadronic picture 1), Open charmed mesons: Ds(2317) Other applications: 2), Y-type: Y(4260), Y(3940); Z-type: Z(4430),Zc(3900) 19
20 3, New baryon resonance of Λc(2940)+ 20
21 Measurement PDG 21
22 Different interpretations 1), Quark model: Isgur-Karl (3/2+,5/2-) Heavy-light diquark model (radial excitation of Λc) 2), Chiral quark model: D-Wave 3), Molecular model (ratios) + 22
23 The assignment of the resonance 23
24 Effective Lagrangians SU(4) PRD81, ,
25 Calculated results 25
26 Radiative decay (1+/2) Gauge Invariance PRD82, ,
27 Three-body decay PRD83, ,
28 Three-body decay (results) PRD83, ,
29 . 4, PANDA & JPARC BEPC, BABAR, BELLE, JLab. PANDA 29
30 PANDA pp pd 0 Λ + c (2286) PRD90, ,
31 Initial state interaction (ISI) ISI 31
32 Differential cross sections 32
33 Differential cross sections 33
34 . JPARC (Hadron Hall) Courtesy of S.Sawada 34
35 Nucl PRD92,
36 Effective interactions 36
37 Matrix elements 37
38 Results (1:total cross sections) 38
39 Results (2: differential cross sections) 39
40 Results (3: Ratio) 40
41 5, Summary 1), Molecule scenario Our approach with hadronic loop Compositness condition + Other Effective Lagrangians X(3872) Zc(3900), Y(4260), Zb(10610), Z b (10650) 2), Baryon resonance Λ+c(2940) 3), Productions of JPARC 41
42 BACKUP
43 X, Y, Z states Courtesy of Brambilla et al.,
44 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 44
45 Some known candidates for hadronic meson-meson molecules a0(980), f0(980) K K D*s0(2317) DK; Ds1 D*K X(3872) D D*+c.c Z(4430) D*(2010) D1(2420)
46 Decay modes 46
47 Calculation: Molecular scenario 47
48 Results
49 BEPC, New resonances of Zc (3900)
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