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新强子态唯象理论进展

新强子态唯象理论进展. 刘 翔 兰州大学 物理科学与技术学院. 中国物理学会高能物理分会第八届全国会员代表大会暨学术年会 4 月 17-20 日 南昌. Outline. Charmonium-like state X(3872), [Z(4430),Z(4051),Z(4248)], [Y(3930),Y(4140)] [X(3915), Z(3930),X(4350)] Charmed-strange state DsJ(2710), DsJ(2860), DsJ(3040) Bottom-strange state

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新强子态唯象理论进展

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  1. 新强子态唯象理论进展 刘 翔 兰州大学 物理科学与技术学院 中国物理学会高能物理分会第八届全国会员代表大会暨学术年会4月17-20日 南昌

  2. Outline • Charmonium-like state X(3872), [Z(4430),Z(4051),Z(4248)], [Y(3930),Y(4140)] [X(3915), Z(3930),X(4350)] • Charmed-strange state DsJ(2710), DsJ(2860), DsJ(3040) • Bottom-strange state Bs1(5830), Bs2(5840) • Y(2175)-Y(4260)-Y(10870) • Summary

  3. X X Charmonium-like state

  4. X(3872) observation PRD71,071103 (2005) PRD73,011101 (2006) PRL93,162002 (2004) PRL91,262001 (2003) first 10s M(J/π+π–) PRL93,072001 (2004) B factories in B decays X(3872)first seen in B →K J/π+π– PRL98,132002(2007) CDF 790fb-1: X→J/ π+π–angular analysis onlyJPC=1++ andJPC = 2–+ • MX close to D0D*0 threshold • (not clear below or above) • M = 3871.4±0.6 MeV • MX – MDD* = (–0.40.7) MeV/c2 • surprisingly narrow: • Γtot < 2.3 MeVat 90% CL • M(ππ) tends to kinematic limit • ππ=? Isospin violation! 1 新强子态唯象理论进展 刘翔 @ 兰州大学

  5. PRD71,031501 (2005) B0 B- X(3872)– X(3872)– 3872 M(J/π–π0) M(J/π–π0) ─ Tetraquark (cq)(cq): L.Maiani, A.D.Polosa, V.Riquer, F.Piccini; D.Ebert, R.N.Faustov, V.O.Galkin 3 states (cu)(cu), (cd)(cu), (cd)(cd) with a few MeV mass splitting Hybrid (ccg) F.E.Close and P.R. Page Threshold cuspD.V.Bugg ─ ─ ─ Explanations to X(3872) • conventional charmonium • JPC=1++ corresponds to c1(23P1) • expected Γ(c1′J/)/ Γ(c1′J/ ) ~30 measured ratio < 0.2 • ~ 100MeV/c2 lighter than expected. D0D*0 molecular state: (the most popular option) E.S.Swanson, F.E.Close and P.R. Page, M.B.Voloshin... NO evidence of X–(3872) J/–0 excludes isovector hypothesis 2 新强子态唯象理论进展 刘翔 @ 兰州大学

  6. X(3872)→J/ψπ+π– BELLE-CONF-0849 B+→XK+ B+→XK+ 8.6σ 12.8 B0→XK0s Swanson, PLB598, 197 (2004) B0→XK0s 2.3σ Relatively large Br(X→(2S)γ) is inconsistent with a pure D0D*0 molecular interpretation for X(3872) 5.9 ─ Br(B0→XK0) / Br(B+→XK+) = 0.41± 0.24±0.05 0.82± 0.22±0.05 Molecular state: the theoretical prediction is less than 0.1 Br(B0→XK0) Br(J/–+)= (6.65± 1.63± 1.00)x10–6 Experimental evidence against the molecular assignment PRD77,111101 (2008) PRL102,132001 (2009) 3 新强子态唯象理论进展 刘翔 @ 兰州大学

  7. c c • Reexamine the X(3872) by potential model • Disfavor the molecular explanation if only considering one pion exchange • If including vector meson exchange, there exist the possibility of DD^* molecular state assignment for X(3872). • However it is dependent on the parameter space. Dynamics calculation Liu, Liu, Deng, Zhu, EPJC56, 63 (2008) Liu, Luo, Liu, Zhu, EPJC61, 411 (2009) What is the structure of X(3872)? Suzuki, PRD72, 114013 Meng, Chao, arXiv:hep-ph/0506222 Zhu, IJMP, E17, 283 Liu, Liu, Deng, Zhu, EPJC56, 63 Mixing mechanism =Coupled channel effect 4 新强子态唯象理论进展 刘翔 @ 兰州大学

  8. Z(4430) arXiv:0810.1073 [hep-ex] No significant Z(4430) signal is observed B→Z-K Z-→ψ(2S)π- PRL100, 142001 (2008) PRD78, 072004 (2008) 6.5σ Z(4430)- Z(4051)- Z(4248)- chargedcharmonium-like state If this result is confirmed first observation of a genuine ccud “exotic” state, since it is charged and carries hidden charm. Z(4051) Z(4248) 5 新强子态唯象理论进展 刘翔 @ 兰州大学

  9. __ Z(4051) disfavor a D*D* molecular state? Explanations for Z(4430) Liu, Luo, Liu, Zhu, EPJC61, 411 (2009) Liu, Zhang, PRC80, 015208 (2009) Z(4248): disfavor D1 D or D0 D* molecular state! Ding, PRD79, 014001 (2009) 6 新强子态唯象理论进展 刘翔 @ 兰州大学

  10. Phys.Rev.Lett.94:182002 (2005) Y(3930) Phys.Rev.Lett.102:242002,2009 Phys.Rev.Lett.101: 082001 (2008) Y(3930) Y(4140) 7 新强子态唯象理论进展 刘翔 @ 兰州大学

  11. Explanation of Y(4140) and Y(3930) Liu & Zhu, PRD80, 017502 (2009) Mahajan, PLB679,228 (2009) Branz, Gutsche, Lyubovitskij, PRD80, 054019 (2009) Dynamics calculation: Liu, Luo, Liu, Zhu, EPJC61, 411-428 (2009) Ding, EPJC64, 297-308 (2009) Other interpretations: Dynamically generated resonances Molina, Oset, arXiv:1001.3005 [hep-ph] Tetraquark state Stancu, arXiv:0906.2485 [hep-ph] 8 新强子态唯象理论进展 刘翔 @ 兰州大学

  12. S-wave D-wave Decay Patterns of Y (4140) and Y (3930) Open charm and hidden charm two-body decays Radiative decays Liu & Ke, PRD80, 034009 (2009) Liang, Molina, Oset, arXiv:0912.4359 [hep-ph] The open-charm decay widths are comparable to the hidden-charm decay width Such a D-wave decay width should be much smaller than that for the above hidden charm S-wave decay mode! Liu, PLB680, 137 (2009): exclude P-wave charmonium explanation for Y(4140) 9 新强子态唯象理论进展 刘翔 @ 兰州大学

  13. Phys.Rev.Lett.104:092001,2010 Phys.Rev.Lett.96:082003,2006 X(3915) Z(3930) Phys.Rev.Lett.104:112004,2010 arXiv:1002.0281 [hep-ex] X(4350) Z(3930) 10 新强子态唯象理论进展 刘翔 @ 兰州大学

  14. 11 新强子态唯象理论进展 刘翔 @ 兰州大学

  15. Charmed-strange state

  16. Phys.Rev.Lett.100:092001,2008 Phys.Rev.D80:092003,2009 hep-ex/0608031 DsJ(2710) Belle DsJ(2860) DsJ(3040) Phys.Rev.Lett.97:222001,2006 12 新强子态唯象理论进展 刘翔 @ 兰州大学

  17. Obtained ratio of D*K/DK is consistent with experimental data. Phys.Rev.D80:092003,2009 1D assignment to DsJ(2710) can be excluded. 13 新强子态唯象理论进展 刘翔 @ 兰州大学

  18. Babar data Phys.Rev.D80:092003,2009 It can be fully excluded since DsJ(2860)->D*K channel was observed ar BaBar D*K/DK=0.36, which is smaller than experimental value Ratio of D*K/DK consistent with experimental data 14 新强子态唯象理论进展 刘翔 @ 兰州大学

  19. Sun, Liu, PRD80, 074037 2S state DsJ(2710): 1 - 1D state DsJ(2860) Matsuki, Morii, Sudoh, EPJA31, 701 (2007) Chen, Wang, Zhang, PRD80, 071502 (2009) A semi-classic flux tube model Zhong, Zhao, PRD81, 014031 (2009) Constituent quark model with effective Lagrangian Colangelo, Fazio, arXiv:1001.1089 [hep-ph] Effective Lagrangian approach 15 新强子态唯象理论进展 刘翔 @ 兰州大学

  20. Bottom-strange state The situation of bottom-strange meson is similar to that of charmed-strange meson before 2003

  21. Strong decay Luo, Chen, Liu, PRD79, 074020 (2009) Phys.Rev.Lett.100:082001,2008 CDF [23] Godfrey, Kokoski, PRD43, 1679 (1991) [24] Eichten, Hill, Quigg, PRL71, 4116 (1993) [27] Falk, Mehen, PRD53, 231 (1996) [29] Colangelo, De Fazio, Ferrandes, NPB. proc. Suppl.163, 177 (2007) [31] Zhong, Zhao, PRD78, 014029 (2008) D0 Semileptonic decay Luo, Chen, Liu, Zhu, EPJC60, 403 (2009) Phys.Rev.Lett.100:082002,2008 16 新强子态唯象理论进展 刘翔 @ 兰州大学

  22. Y(2175)-Y(4260)-Y(10870)

  23. PRD74, 091103 (2006) PRL100, 102003 (2008) PRD80, 031101 (2009) BES [1] BaBar, PRD74, 091103 (2006) [2] BES, PRL100, 102003 (2008) [3] BELLE, PRD80, 031101 (2009) [4] BES, PLB685, 27 (2010) [5] BaBar, PRD77, 092002 (2008) Y(2175) 17 新强子态唯象理论进展 刘翔 @ 兰州大学

  24. Y(4260) 18 新强子态唯象理论进展 刘翔 @ 兰州大学

  25. Phys.Rev.Lett.100:112001,2008 arXiv:0810.3829 Y(10870) Energy scan above Υ(4S) to search for counterpart of Y(4260) in bottomonium sector: study cross section of e+e→Υ(nS)π+π, (n=1, 2, 3) New bottomoniumlike state or anoumalous large Υ(5S) → Υ(nS)ππdecay Υ(5S) : m=10.865 GeV Г=110 MeV 19 新强子态唯象理论进展 刘翔 @ 兰州大学

  26. Y(2175) Y(4260) Y(10870) Strange Charm Bottom 20 新强子态唯象理论进展 刘翔 @ 兰州大学

  27. Summary • Charmonium-like state X, Y, Z • Distinguish the conventional charmonium state and exotic states • Above the thresholds of a pair of charmed mesons Important non-perturbative effect Coupled-channel effect • Mass spectrum + Production + Decay • More experimental information is needed • Charmed-strange meson DsJ(3040) 2P state (1+ state in S doublet) Four states DsJ(2860)+DsJ(2710) ----- 2S and 1D statesSix states The experimental search for charmed-strange meson with high radial excitation 21 新强子态唯象理论进展 刘翔 @ 兰州大学

  28. Bottom-strange meson • Bs1(5930)+Bs2(5940) 2P states in T doublet (1+,2+) • Two 2P states in S doublet (0+, 2+) are missing • Nowadays, the situation of bottom-strange meson family is very similar to that of charmed-strange meson family before 2003 Future experimentsLHCb? • Y(2175) Y(4260) Y(10870) • Similar decay channel phi pi pi J/psi pi pi Upsilon(nS) pi pi • Similar theoretical explanation Hybrid Mutiquark state Molecular state • Distinguish different theoretical assignments Y(2175)BESIII Y(4260) Exotic state? Other mechanisms? Y(10870) Upsilon(5S)? exotic state? 22 新强子态唯象理论进展 刘翔 @ 兰州大学

  29. New hadron state: an active research field in hadron physics BESIII Super B PANDA LHCb 2003 2010 Charmonium-like states X, Y, Z Charmed-strange meson DsJ Bottom-strange meson BsJ Light hadrons X(1860), X(1835), Y(2175) …… Y(4260) DsJ(2317) DsJ(2460) X(1860) + …… More efforts:theoretical work+ experiment 23 新强子态唯象理论进展 刘翔 @ 兰州大学

  30. Thank you for your attention!

  31. Backup slides 2 新强子态 刘翔 @ 兰州大学

  32. Phys.Rev.Lett.90:242001,2003 DsJ(2317) Phys.Rev.D68:032002,2003 DsJ(2460) C The low mass puzzle of DsJ (2317) and DsJ (2460) Experimental masses are 100 MeVlower than the expected values in quark models S. Godfrey and R. Kokoski, PRD 43, 1679 (1991); S. Godfrey and N. Isgur, PRD 32, 189 (1985); M. Di Pierro and E. Eichten, PRD 64, 114004 (2001) Barnes, Close, Lipkin PRD68, 054006 (2003) Cheng, Hou, PLB566, 193 (2003) Chen, Li, PRL93, 232001 (2004) Four-quark state? Coupled-channel effect plays an important role to understand the low mass puzzle van Beveren, Rupp, PRL91, 012003 (2003) RSE EPJC32, 493 (2004) Dai, Li, Zhu, Zuo, EPJC55, 249 (2008) QSR Liu，Liu，Zhu PRD79, 094026 (2009) CHPT Charmed-strange Godfrey, PLB568, 254 (2003) Colangelo, De Fazio, PLB570, 180 (2003). Dai, Huang, Liu, Zhu, PRD68, 114011 (2003) 13 新强子态唯象理论进展 刘翔 @ 兰州大学

  33. arXiv:0808.1543 Y(4260) e+e–→J/ψπ+π–γISR Y(4260) ... Y(4008)? Y(4008) Br(J/ψπ+π–)Γee , eV Solution1 Y(4008)Solution2 < 0.7 90% CL Solution1 Y(4260)Solution2 Absence of open charm production is inconsistent with conventional charmonium 7.5±0.9±0.8 21 新强子态唯象理论进展 刘翔 @ 兰州大学

  34. e+e–→ψ(2S) π+π–γISR Y(4360), Y(4660) ... PRL 98, 212001 (2007) PRD 78, 014032 (2008) Y(4360)→ψ(2S)ππ Y(4660)? PRL 99, 142002 (2007) Y(4360) Y(4660) 6.1σ 298 fb-1 Y(4660) 5.8σ Y(4360) 8σ 670 fb-1 2-BW fit with interference Solution1Solution2 Br(ψ(2S)π+π–)Γee , eV Y(4360) Y(4660) Combined fit to BaBar&Belle data on e+e–→(2S) π+π–γISR Best measurements of Y(4360) and Y(4660) Assume all the cross sections are due to Y(4360) and Y(4660) added coherently Absence of open charm production is inconsistent with conventional charmonium

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