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CONVENTIONAL CHARMONIA

CONVENTIONAL CHARMONIA. Section Editors BaBar: Riccardo Faccini Belle: Pavel Pakhlov Theory: Nora Brombilla. Outline of the section. 0. Introduction Observation of new conventional charmonium states 1.1  c (2S) 1.2  c2 (2P) 1.3 X(3940)/X(4160) 1.4 X(4630)

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CONVENTIONAL CHARMONIA

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  1. CONVENTIONAL CHARMONIA Section Editors BaBar: Riccardo Faccini Belle: Pavel Pakhlov Theory: Nora Brombilla

  2. Outline of the section. • 0. Introduction • Observation of new conventional charmonium states • 1.1 c(2S) • 1.2 c2 (2P) • 1.3 X(3940)/X(4160) • 1.4 X(4630) • 2. Observation of new decay modes of known charmonia • 2.1 c • 2.2 ψ(4415)  DD2 • 2.3 ψ(4040/4160)  DD, DD*, D*D* • 3. Measurements of parameters (mass, width, Br) • 3.1 c mass and width, transition FF • 3.2 J/ψ: Γee, Γtot from ISR • 3.3 c0 andc2 • 3.4 ψ(3770) mass and width • 4. Production • 4.1 in two body B-decays (interfere with B  charm) • 4.2 in ee annihilation (interfere with fragmentation) • 4.3 in gamma-gamma • 4.4 in ee annihilation at threshold (ISR) • 5. Theoretical insights From pedagogic point of view, it is better to start from “Production”

  3. Conventional charmonium • How to distinguish from exotic charmonium? • We live in the era, when any newly observed particle is by default an exotic. You need to prove that it can fit the quark model. • We are still disputing on inclusion of these states in our section: • c(2S) • c2 (2P) • X(3940) as c(3S) • X(4160) as c(4S) • X(4630) as ψ(5/6S) • do not contradict to quark model, at least qualitatively • “conventional” observation decay modes • some theorists agree that these can be conventional charmonium states

  4. Spin quarks Total momentum n2S+1LJ Radialexcitation Orbital momentum ...10 states were discovered before 1980, no one 1980-2002 J = S + L P = (–1)L+1parity C = (–1)L+Scharge conj. ...5 candidates to the standard charmonium have been observed since 2002 by BB hc have been observed by CLEO in 2003

  5. BaBar & Belle papers related to c(2S) + CLEO

  6. c(2S) M = 2654  6  8 MeV/c2  < 55 MeV M = 3630.8  3.4  1.0 MeV/c2  = 17.0  8.3  2.5 MeV • B  (KSK) K γγ (KSK) c(2S) M = 2630  12 MeV/c2 M = 3645  5.5  7.9 MeV/c2  = 22  14 MeV e+e– J/ X e+e– J/ X

  7. c(2S) parameters Mass Total width 6±12 MeV (CLEO) 17± 8 MeV (BaBar) PDG average: Γ = (14 ± 7) MeV γγ width Only CLEO result is used in PDG Absolute Br Br (c(2S)  KSKπ)= (1.9 ± 1.2) × 10− 2 Derived by PDG from BaBar measurements of Br(B+→ ηc(2S) K+) × Br(ηc(2S) → KKπ) and absolute Br( B+ → ηc(2S) K+ )

  8. c2’ in  χс2’ e+ e+ γ D γ D e– e–

  9. 2006, Belle M=393142MeV/c2 =2083MeV Helicity angle distribution consistent with J=2 J=0 disfavored 2010, BaBar M=3926.72.71.1MeV/c2 =21.36.83.6MeV Mass is 50-100 MeV lower than potential model predictions; width and Γγγare in agreement with theory

  10. X(3940) and X(4160) ine+e−→J/ D*D(*) M = 3942 ±6 MeV tot =37 ±12 MeV +7 −6 +26 −15 • decay to open charm final states like conventional charmonium • production mechanism fix C=+1 • known states produced in e+e− →J/ cc have J=0 • not seen in DD decay, exclude JPC=0++ • Plausible assignments are JPC=0–+ • X(3940) = 31S0 = ηc(3S) • X(4160) = 41S0 = ηc(4S) • For both X(3940) and X(4160) the masses predicted by the potential models are ~100250 MeV higher 6.0  X(3940) → DD* +25 −20 M= 4156 15 MeV tot = 139 21 MeV +111 − 61 5.5 X(4160) → D*D* ArXiv:0810.0358 PRL 98, 082001 X(3940) ≠ Y(3940)

  11. X(4630) ≡ Y(4660)? X(4630) in e+e–→Λc+Λc–γISR • JPC=1– – • dibaryon threshold effect or state? • the shape differs from those for light baryon-antibaryon production at threshold (ee→ΛΛ, ee→pp) • Plausible assignments are • X(4630) = ψ(5S) or ψ(6S) e+e–→Λc+Λc–γISR

  12. Observation of new decay modes DD e+e–→D(*)D(*)γISR DD* e+e–→DD2γISR B()K D*D* BR = (10.5 ± 2.4 ± 3.8)%

  13. Parameters (M, width, Br) of known charmonia Many papers: • do not need to describe the analyses (hopefully will be well described in other sections TWO-PHOTON, ) just review

  14. c parameters B(γγ)K B  K(cc) γγpp Mass Total width Absolute Br Br (c  γγ) and γγ-width Br (c KSKπ)= (8.5 ± 1.8 ) × 10− 2

  15. c transition FF tagged data tag 2< Q2<50 GeV2 Also γγ-width at Q2=0; to be included in PDG

  16. J/ψ in ISR Γtot = (93.7 ± 3.5) keV Γee = (5.57 ± 0.19) keV Similar accuracy to CLEO measurement and better than BES and χc0, χc2 in γγ

  17. ψ(3770)

  18. Production: two body B-decays Production: ee annihilation

  19. Contributors: principal authors of “observation” papers # of pages: rough estimate ~ 15 + 5 for the production

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