from Belle, BaBar and CLEO Results on Rc from Belle, BaBar and CLEO Galina Pakhlova ITEP, Belle collaboration

Historical remarks on inclusive measurements  states were discovered at e+e– colliders (4415) MARK-I 1976, DASP 1978 (3770) MARK-I 1977, DELCO 1978, MARK-II 1980, BESII 2005 (4040) and (4160) DASP 1978 Total cross section e+e–  hadrons Crystal Ball 1986 BESII 2005 CLEO 2009

Exclusive measurements of  state decays Only (3770) non-DD decays problem The single measurement of D and D* meson production at Ecm= 4.028 GeV Phys.Lett.B 69, 503 1977 The single measurement of Λc production at Ecm= 5.2 GeV Phys.Rev. Lett. 44, 10 1980 BESII fit of R spectrum Phys.Lett.B660,315 2008 All possible two-body decays of ψ(3770), ψ(4040), ψ(4160), ψ(4415) model-dependent results Resonance shapes Interference term Rres=RBW+Rint Phys.Lett.B660,315(2008)

Not only B-Factories but Charm-Factories as well Luminosity at B factories Not only B-Factories but Charm-Factories as well 4

ISR measurements at B-factories Fixed quantum numbers of final state JPC = 1– – Study of open charm final states from threshold in wide energy region Huge accumulated luminosity at B factories Limited statistics strong electromagnetic suppression typical events topology: fast photon with small pt Specific reconstruction methods e.g. D+D*– & D*+D*– partial reconstruction of D*– to increase efficiency by 10-20 reconstruction of ISR photon measurements of recoil mass against γISR ≡ mass of D(*)+D*– translation of D(*)+D*– mass spectrum to cross section e.g. D+D– full reconstruction of hadronic part no reconstruction of ISR photon

Two-body final states

Belle, BaBar, CLEO: σ(e+e− →DD) Phys.Rev. D76, 111105(2007) Phys.Rev. D77, 011103(2008) Phys.Rev. D80, 072001(2009) CLEO: narrow range 3.97 - 4.26 GeV no radiative corrections problem of direct comparison with B-factories results Wide structure near 3.9 GeV agreement with coupled channel model Structure at 4.0 - 4.2 GeV (4040)? (4160)? First hint of (4415) →DD Good agreement between Belle и BaBar

Belle, BaBar, CLEO: σ(e+e−→D(*)D*) Phys.Rev. D79, 092001(2009) Phys. Rev.Lett. 98, 092001 (2007) Good agreement between Belle и BaBar Belle measurements more accurate than BaBar Phys.Rev. D80, 072001(2009) ψ(4160) ψ(4040) CLEO: 3.97 - 4.26 GeV no radiative correction problem of direct comparison with B-factories results

Energy scan with high accuracy but in narrow region 3.97 - 4.26 GeV e+e– → Ds(*)+Ds(*)– Ds+Ds*– Ds+Ds– Ds*+Ds*– The single measurement of CLEO 2009 Energy scan with high accuracy but in narrow region 3.97 - 4.26 GeV Problems Cross sections of charm strange mesons were found to be order of magnitude less than cross sections of D(*)D(*) Ds* Dsγslow very low efficiency of soft photons at threshold multiple counting due to lots of soft photons in event

Belle measurements of e+e– → Ds(*)+Ds(*)– Full reconstruction method similar to DD Ds*+Ds*– Ds+Ds– Ds+Ds*– (4415) (4160) (4040) Sum of e+e– → Ds(*)+Ds(*)– (4040) (4160) (4415) Y(4260) Ds+Ds– peak at threshold near (4040) Ds+Ds*– peak at threshold near (4160) and (4415) dip near Y(4260) mass

Belle, BaBar, CLEO: e+e– → Ds(*)+Ds(*)– BaBar: Bin size of 100 MeV is too large to observe relatively narrow structures Belle & BaBar are in agreement within errors CLEO: 3.97 - 4.26 GeV no radiative corrections Ds+Ds*– Ds+Ds–

Three-body final states D0 D(*)− π+ Full reconstruction method

Cross section of e+e− D0D–+ 670 fb-1 Phys.Rev.Lett.100,062001(2008) (4415)D0D–+ M = 4411 ± 7 МэВ Γtot = 77 ± 20 МэВ Nev= 109 ± 25 In agreement with BES Phys.Lett.B660,315(2008) PDG06, Barnes at.al Phys. Rev. D72, 054026 (2005) σ(e+e–→ψ(4415))×Br(ψ(4415)→DD2(2460))×Br(D2(2460) →Dπ) = (0.74 ± 0.17 ± 0.07)nb Br((4415)  D(D)non D2(2460))/Br((4415) DD2(2460))<0.22

Cross section of e+e− D0D*–+ ψ(4415) Upper limit Y(4260) ψ(4415) Phys.Rev.D 80, 091101 (2009) σ(e+e–→ψ(4415))×Br(ψ(4415)→D0D*–π+)< 0.76 nb at 90% CL Br(ψ(4415)→ D0D*–π+) < 10.6 % at 90% CL UL at 90% CL

First final state with charm baryons 670 fb-1 X(4630) 8.2σ Phys.Rev.Lett.101,172001(2008) e+e–→Λc+Λc– X(4630) ≡ Y(4660)? JPC=1– – e+e–→Λc+Λc– (5S) or (4D) J.Segovia, at al (6S) B.Q.Li and K.T.Chao influence of (3D) E.Beveren, G.Rupp (2S)f0(980) molecule F.K.Guo et al tetraquark D.Ebert et al hexaquark M.Abud,F.Bucella, F.Tramontano charm baryonium G.Gotugno, R.Faccini, A.Polosa baryon-antibarion production via (4S) intermediate state Yu.Simonov hep-ph 1109.5545

Exclusive cross sections contribution to the total cross section DD DD* D*D* DDπ Exclusive cross sections contribution to the total cross section DD*π ΛcΛc DsDs +DsDs* +Ds*Ds* Contributions of D+D*–, D*+D*–, D0D–π+ and D0D*–π+ are scaled following isospin symmetry

In conclusion...

Search for charmonium-like states Y family no peaks near Y states mass in exclusive open charm cross sections X(4630) ? minima near Y(4260) mass in cross sections of e+e– → D*+D*–, Ds(*)+Ds(*)– predictions of dominant decays of Y(4260)  DD(*)π were not confirmed X(4630) quantum numbers, mass and width are in agreement with Y(4660) does not mean that X(4630) ≡ Y(4660) lots of interpretations – absence of clear understanding of X(4630) nature

Status and perspectives Almost all measured cross sections are included into Durham Hep Data Base Parameters and branchings of observed decays of (4415), σ(ee D0D0)/σ(eeD+D−) for (3770), upper limits on YDD*π are included to PDG tables Obtained results are important for physical programs of experiments at e+e– colliders KEDR at VEPP-4M BESIII at BEPCII c-τ factory in Novosibirsk Belle II at SuperKEKB ... and for theory

(4040) (4160) Y(4260) Thank you!