Charmonium Decays at BESIII

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Presentation transcript:

Charmonium Decays at BESIII Ping Wang (for the collaboration of BESIII) Institute of High Energy Physics, Beijing, China HFCPV11, Hangzhou, October, 2011 4/23/2019 Ping Wang (IHEP, Beijing)

Ping Wang (IHEP, Beijing) Outline Brief introduction of BEPCII & BESIII Charmonium decays: 'P , cJV, cJVV Summary 4/23/2019 Ping Wang (IHEP, Beijing)

Ping Wang (IHEP, Beijing) BEPCII & BESIII Large luminosity Updated detectors Charm energy region BESIII is special! Abundant potential physics with BESIII. 4/23/2019 Ping Wang (IHEP, Beijing)

Charmonium spectrum below open charm threshold 106M (2S) at BESIII 0 4/23/2019 Ping Wang (IHEP, Beijing)

' P(0,,'), arise surprises V P are important tests for various mechanisms: Vector meson Dominance Model (VDM); Couplings & form factor; Mixing of -′(-c); FSR by light quarks; 12% rule and “  puzzle”. theory experiment CLEO-c: J/ψ, ψ', ψ''  P RJ/ = (21.1± 0.9)% No Evidence for '  0 or   Br(′′)=(1.19 ± 0.09)% R' < 1.8% at 90% CL R' << RJ/ PRD 79, 111101 (2009) 4/23/2019 Ping Wang (IHEP, Beijing)

Ping Wang (IHEP, Beijing) ’ P at BESIII PRL 105, 261801 (2010) ψ'→ γη (First observation) ψ'→γ0 (First observation) ψ'→ γη' +-0 000 ’+- ’+- R′= 1.10±0.38±0.07% << RJ/ Mode B(’) [x10-6] B(J/) [x10-4] Q (%) 0 1.580.42 0.350.03 4.5  1.3  1.380.49 11.040.34 0.13  0.04 ’ 1269 52.81.5 2.4  0.2 Possible interpretation: Q. Zhao, Phys. Lett. B697, 52 (2011) 4/23/2019 Ping Wang (IHEP, Beijing)

cJ V(,,) , prediction by pQCD much lower than experiment Information of C-even state Two gluon coupling Possible glue-ball or hybrid states Hadronization Br. are in unit of 10-6. 4/23/2019 Ping Wang (IHEP, Beijing)

cJ V(,,) results at BESIII Phys. Rev. D 83, 112005 (2011) BESIII <10.5 228±13±16 <20.8 <12.9 69.7±7.2±5.6 <6.1 <16.2 25.8±5.2±2.0 <8.1 First observation An non-pQCD explanation “hadronic loop correction”, D.Y Chen et al. arXiv:1005.0066v2[hep-ph] EPJC70, 177-182 (2010) 4/23/2019 Ping Wang (IHEP, Beijing)

Longitudinal polarization dominates Polarization of c1 V(,,) L: Longitudinal polarization, T: Transverse polarization, θ: Helicity angle Longitudinal polarization dominates D.V. Amelin et al. (VES Collaboration), Z. Phys. C 66, 71 (1995) C.N. Yang, Phys. Rev. 77, 242 (1950) 4/23/2019 Ping Wang (IHEP, Beijing)

cVV(V=, ), suppressed decays cJ    and cJ    are Singly OZI suppressed cc1 ff and cc1ww is suppressed by helicity selection rule. ccJ fw is doubly OZI suppressed, not measured yet BESII on c0,2    /   PLB 642,197(2006), PLB 630,7 (2005) Reconstruct  and  via K+K- or +-0 4/23/2019 Ping Wang (IHEP, Beijing)

Ping Wang (IHEP, Beijing) cVV at BESIII Accepted by PRL First observation Evidence Large distance effect: X. H. Liu, et al, PRD 81, 014017 (2010) D.Y. Chen, et al, PRD 81, 074006 (2010) 4/23/2019 Ping Wang (IHEP, Beijing)

Ping Wang (IHEP, Beijing) summary With very high luminosity, BEPCII/BESIII is the best instrument to study the physics at -charm region. BESIII has obtained good measurements on decays of ′ P, cJ V and cJ VV. With the accumulated 106M ′ sample, these results are precision measurements or first observation. More exciting/interesting results are coming. Thanks! 4/23/2019 Ping Wang (IHEP, Beijing)