New Charmonium Results from CLEO c
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1 New Charmonium Results from CLEO c Helmut Vogel (for the CLEO Collaboration) Carnegie Mellon University CHARM09, Leimen, Germany One of the last CLEO c events (taken on 3 March 2008) e+e- Ds*+Ds-
2 CLEO c Data Sample for Charmonium Program 818/pb at (3770) (mostly open charm but also charmonium) J/ 54/pb at (2S) > 27 M (2S) (largest pre BESIII world supply) In praise of (2S): B( (2S) + J/ = 32% ( 75%) B( (2S) cj 9% for each of J=0,1,2 Clean, tagged, abundant J/, cj (and hc)! Study Decays of states (hadronic & radiative) Transitions between states Spectrum of states Overarching theme: Use charmonium as a laboratory to test quarkonium potential models QCD, pqcd, NRQCD, LQCD 2
3 Two Body Mesonic Decays of χcj χc0 χc2 χc0 χc2 Two body decays are theoretically clean : probe role of the color octet mechanism probe gluon content of final state mesons Results for two body baryonic decays have also recently been published: CLEO PRD 78, (R) (2008) BF or 90% CL UL (10 3) CLEO PRD 79, (2009) Substantial improvement over current world averages in some channels! 3
4 Example: χcj η η ( ) ( ) Measured BRs constrain ratio of Double OZI to Single OZI amplitudes Theory: Close & Zhao, PRD 71, , factorization a la Zhao, PRD 72, ; PLB 659, 221 χc0 PP χc2 PP η'η' ηη ηη' ηη η'η' ηη' Data suggest small (if any) contribution of DOZI decays in 0 + channel. 4
5 Evidence for Hadronic Decay of the hc The only previously observed decay: ψ(2s) π0hc) x B(hc γηc) ; product BF: 4.2 ± 0.6) x 10 4 (CLEO PRL 101, (2008)) > 4σ significance Godfrey & Rosner predict 73% direct hadronic decay (PRD 66, (2002)) Expect odd number of pions (negative G parity) Measure B(ψ(2S) π0hc) x B(hc X) X = n(π+π ) π0 (n=1,2,3): Mode Product BF (10 5) π+π π0 < ± 0.5 ± 0.4 < 2.4 2(π+π ) π0 3(π+π ) π0 CLEO Preliminary 2(π+π-)π0 Invariant Mass (GeV/c2) 5
6 (Aside: Precision hc Mass Measurement) CLEO PRL 101, (2008) 9 Result: M(hc)=( ±0.19±0.12) MeV cf. <M( cj)> =( ±0.11) MeV (PDG) HF splitting of 1P states is negligibly small! 6
7 Radiative Decays and Transitions 7
8 B(ψ(2S) γgg) / B(ψ(2S) ggg) CLEO Preliminary State J/ψ ψ(2s) ϒ(1S) ϒ(2S) ϒ(3S) B(X γgg) / B(X ggg) ± ± ± ± ± ± ± ± ± ± CLEO PRD 78, (2008) CLEO Preliminary CLEO PRD 74, (2006) 8
9 J/ψ,ψ(2S) γ ηc CLEO PRL 102, (2009) 9
10 The ηc Lineshape 10
11 Eγ = 48 MeV inclusive analysis too difficult; instead search for ψ(2s) γηc? ψ(2s) γηc ; ηc X ψ(2s) γηc ; ηc π π ηc; ηc X + Calibrate analysis on ψ(2s) γχc2 transition Using known B(ηc KKπ) and ηc branching fractions, can set 90% C.L. limits Scaling from J/ψ γηc one expects B(ψ(2S) γηc ) = 4 x 10 4 ηc KKπ ηc π+π-ηc Results (CLEO PRELIMINARY): B(ψ(2S) γηc ) < 7.4x10 4 B(ψ(2S) γηc ) x B(ηc π+π ηc) < 1.4x
12 J/ψ,ψ(2S) γ(π0,η,η ) J/ψ ψ(2s) γη mode (dominating QED bgd in γγ mode) γγ 3π0 π+π-π0 γπ+π- Results: consistent with known η η' mixing surprise: R1, R2 expected to be about equal! CLEO arxiv: [hep-ex], accepted by PRL 12
13 χcj γ(ρ,ω,φ) Look for: M(π+π ) ψ(2s) γ(low)χcj χcj γ(high)(ρ,ω,φ) γρ M(π+π π0) Significant signals observed in: χc1 γρ χc1 γω 1. cut on hadronic mass 2. look at low E photon γω γφ CLEO PRL 101, (2008) Expect process to be analogous to that of glueball production, e.g., in J/ψ γfj pqcd predicts rates an order of magnitude lower than observed! (Gao, Zhang, Chao, Chin.Phys.Lett. 23, 2376 (2006) [arxiv:hep-ph/ ]) 13
14 χcj γγ Two photon widths of χcj probe relativistic and radiative corrections known to be significant in charmonium. ψ(2s) γχcj; χcj γγ Results: Γγγ(χc2) = 0.66 ± 0.07stat ± 0.04syst ± 0.05PDG kev Γγγ(χc0) = 2.36 ± 0.35stat ± 0.11syst ± 0.19PDG kev Ratio = ± 0.050stat ± 0.018syst ± 0.031PDG In pqcd, uncertainties due to quark mass and wave function cancel, making the ratio of widths, R, a key quantity. To first order in αs: New world avg.: R = 0.22 ± 0.03 higher order corrections very significant CLEO PRD 78, (2008) 14
15 J/ 3 This is the quarkonium analogue of orthopositronium decay. Tag via (2S) + J/ (eliminates QED background!) MC MC Veto resonances 0,, ', c Main remaining background: J/ 0 0 MC Data Tagging gives very clean J/ sample! 15
16 J/ 3 Perform kinematic fit; Signal peaks at low 2/dof Background rises away from zero (and is independent of 0 0 substructure!) Result (CLEO PRL 101, (2008)): B = (1.2 ± 0.3 ± 0.2) x 10 5 (6 ) First observed 3 decay of any hadron! region used to normalize bkgd signal Theory: in QED, B(3 )/B(3g) ( / s)3 and B(3 ( /14)B 3 x10 5 But NLO QCD corrections give negative rate! (Higher order corrections very significant) background subtracted As byproduct we obtain upper limit on ηc γγ : B(ηc γγ) < (90% CL), PDG: ( )
17 Summary of CLEO c Charmonium Results Precision measurement of hadronic two body decays of χcj First evidence for hadronic hc decay (and precision measurement of the hc mass) First measurement of B(ψ(2S) γgg) / B(ψ(2S) ggg) ; completes set for heavy vector states New measurements for M1 transitions J/ψ,ψ(2S) γηc Understanding of lineshape crucial for ηc mass and BF measurements New limit on ψ(2s) γηc Study of J/ψ,ψ(2S) γ(π0,η,η ); surprising suppression of ψ(2s) γη First observation of χcj γ(ρ,ω,φ); rates much larger than predicted Precision measurement of two photon widths of χc(0,2) First observation of the 3 photon decay of a meson: J/ 17
18 Concluding Remarks Rich program of hadronic physics at CLEO c (too extensive to cover it all here) precision measurements of the mass of η (PRL 99, (2007)), and η (PRL 101, (2008)) most precise single measurement of all dominant η B.F. s (PRL 99, (2008)), η B.F. s (arxiv: ), and rare η decays (PRL 102, (2008)) precision branching fractions for ψ X J/ψ (PRD 78, (R) (2008))...and several analyses still in the pipeline M2/E1 in χcj transitions analysis of ψ ππ J/ψ matrix elements (J/ψ, ψ ) (γ,π0)pp; χcj Xpp search for invisible (radiative) decays of J/ψ spectroscopy in hadronic χcj decay CLEO c has been laying a solid foundation for BESIII to build on. 18
19 Backup Slides 19
20 20
21 Data MC η' Mass Use (2S) + J/, J/ ' Similar technique as in mass measurement Result: (CLEO arxiv: , subm' to PRL) M( ')=( ±0.054±0.036) MeV consistent with and substantially more precise than previous world average Implication for the pseudoscalar ' mixing angle: P=(41.461±0.008)0 (Jones & Scadron 1979) Agrees with P from BFs: flavor symm' breaking small? check: J/ M M(PDG07) in MeV 21
22 η branching fractions 22
23 structure in the decay χc1(1p) γ(ρ,ω) The ρ decay exhibits Polarization longitudinal polarization Statistics are less precise for ω, but it is also consistent with longitudinal polarization This parallels that measured for a1 γρ by VES (Z. Phys. C 66, 71 (1995)) Expected from Landau-Yang ρ decay angle (top) orientation of ω decay plane (bottom) 23 M. R. Shepherd GHP Workshop, Denver April 29, 2009
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