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cc spectroscopy at elle

_. cc spectroscopy at elle. S.L.Olsen Hawaii. QWG 2004 Worksop IHEP Beijing. B-factory bonuses:. new insights/puzzles about charmonium. B  K K s Kp. B  K p + p - J/ y. h c ’. X(3872). M(K s K p ). M( p + p - J/ y). e + e -  J/ y cc. B  K w J/ y. ??. ??.

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cc spectroscopy at elle

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  1. _ cc spectroscopy at elle S.L.Olsen Hawaii QWG 2004 Worksop IHEP Beijing

  2. B-factory bonuses: new insights/puzzles about charmonium BK KsKp BKp+p-J/y hc’ X(3872) M(KsKp) M(p+p-J/y) e+e-J/y cc BKwJ/y ?? ?? hc ‘ cc0 hc J/y recoil mass M(wJ/y)

  3. bccs is a dominant process CKM favored J/y, y’, hc, cc1,… c Vcb c b W- Brs~10-2 (inclusive) cosqC s B mesons are a good source for charmonium and other cc states

  4. KEKBis a good source of Bs >900pb-1/day (~1M BBs/day) 1.2x1034/cm2/s

  5. Kinematic variables for the (4S) BK hc Ecm/2 KSKp e- e+ B B ϒ(4S) Ecm/2 DE CM energy difference: BK hc KSKp Beam-constrained mass: Mbc

  6. 1st Observation of the hc ‘

  7. BK (KSK±pŦ)Mbc for 40 MeV M(KSKp) slices 3640 MeV BK hc’ 42fb-1 KSKp BK hc 3000 MeV KSKp

  8. … Fit each bin 3.55 GeV • Nevt = 45.3 ± 12.6 Mhc’ = 3653 ± 10 MeV • Ghc’ = 33 ± 22 MeV hc’: 3.60 GeV 3.65 GeV 3.70 GeV 3.75 GeV Mbc DE … • Nevt = 90.5 ± 14.9 Mhc = 2978 ± 5MeV • Ghc = 33 ± 16 MeV hc: M(KSKp) S.K. Choi et al PRL 91, 102001

  9. Subsequent measurementsconfirm higher mass value ggKSKp ggKSKp 3642 MeV BaBar (preliminary) CLEO hep-ex/0306060 e+e-J/yX 3630 MeV 3633 MeV elle hc hc ‘ Mx

  10. hc’: current status Mavg =3637±4 MeV (Crystal Ball excluded)

  11. DM(1S) = MJ/y – Mhc =117±1 MeVDM(2S) = 49 ± 4 MeV gets smaller

  12. The X(3872) with 253 fb-1

  13. B±K±p+p-J/y Nev = 48.6 ± 7.8 M = 3872.4 ± 0.7 MeV

  14. Now M(p+p-) is really r-like

  15. X(3872) Mass D+D*- threshold

  16. Look at BK p+p-p0 J/y

  17. BK w J/y wp+p-p0 M(J/yp+p-p0) BK X(3872); XJ/yp+p-p0? M(p+p-p0)

  18. Mbc 1: look at BK w J/yDalitz Plot cut here M2(J/yw) DE BK* J/y Kw Mp+p-p0 M2(Kw)

  19. Slice into 40 MeV-wide M(w J/y) bins Large deviation from phase-space Fit

  20. Slice into 40 MeV-wide M(w J/y) bins Adding a BW helps Fit M≈3940 ± 11 MeV G≈ 92 ± 24 MeV

  21. M(Kw) for the signal region 3880 <M(wJ/y)<3900 MeV No peaking In M(Kw) M(Kw) (GeV)

  22. Look back at the p+p-p0 masses Very clear w signal 28w’s 76w’s 20w’s 26w’s

  23. What is it? • Charmonium? • Conventional wisdom: wJ/y should not be a discovery mode for a cc state with mass above DD & DD* threshold! • Some kind of w-J/y threshold interaction? • the J/y is not surrounded by brown muck; can it act like an ordinary hadron? • cc-gluon hybrid? • Predicted by lattice QCD, including states with large hadron+cc widths, but predicted masses are ~ 4.4 GeV w J/y

  24. Next: B±K± X(3872) p+p-p0J/y M(J/yp+p-p0) look along here BK X(3872) J/yp+p-p0 M(p+p-p0)

  25. M(3p J/y) = MX(3872)± 16.5 MeV (±3 s) Look at 25 MeV-wide M(p+p-p0) mass bins Mbc DE

  26. B-meson yields vs M(p+p-p0) 12.4 ± 4.2 evts

  27. “Sidebands” BKwJ/y Non-resonant or “peaking bkgd sidebands Overlap region

  28. Cross-talk from BKwJ/y enhancement?  f dm = 0.75 ±0.14 evts Check : signal yield for M(3p J/y)= M X(3872) +1s/–3s (no overlap with w band) 12.4 evts  11.5 evts (expect 11.0 for no X-talk)

  29. Other sidebands(no significant signals) 4.3 ±6.2 evts Non-res bkd in signal bin = 1.3 ± 1.0 evts 6.4 ± 5.6 evts Area of I and III each = 4x Area o signal bin

  30. Branching fraction 0.188 13.1 ± 4.2 Br(Xp+p-p0 J/y) Br(Xp+p-J/y) Nev(p+p-p0 J/y) e(2pJ/y) Nev(p+p-J/y)e(3pJ/y) = 62.6 ± 8.3 0.036 = 1.1 ± 0.4 (stat) ± 0.3 (syst) Accept:ance: 10% Xtalk/Bkgnd: -20% Xp+p-p0 J/y: +25% M(3p)<750 MeV significance ≈ 4s

  31. Consistent with sub-threshold X(3872)w J/y • Mw + MJ/y = 3879 MeV (7 MeV above 3872) • Xw J/y occur via virtual w’s, 3p masses cluster at the kinematic limit. • G(XwJ/y)/G(Xp+p- J/y) = 1.1 ±0.4± 0.3 • In agreement with Swanson’s DD* bound-state model for the X(3872)[PLB 588,189 (2004)] • Smoking gun for qqqq interpretation of X(3872)? - -

  32. update continuum e+e-J/y (cc) with 287 fb-1

  33. 2002 2003 L=101 fb-1 L=155 fb-1 - • e+e-J/y (cc) > e+e-J/yglue • s(e+e-J/yhc) > 10x theory • evidence for hc’ • ggJ/y J/y negligible • confirm hc’ 2004 287 fb -1 ‘ hc hc cc0 non-zero continuum below DD threshold 4th peak!!

  34. What is the 4th peak? • the reconstruction and selection procedure is the same as before • Extend the fit region • no signal of X(3872) • significant (>4s) peak at M=3940  11 MeV • N=14833 (4.5) • the width is consistent w/ resolution (= 32 MeV) X(3872) hc ‘ hc ‘ cc0 hc What is it? cc0? hc ?? ‘ “

  35. Look at e+e-J/y D(D(*)) • Reconstruct a J/y & a D • use D0K-p+ & D+K-p+p+ • Determine recoil mass

  36. Look at M(DD(*)) 3940 MeV 9.9 ± 3.3 evts (4.5 s) DD* cc0DD* ‘ DD 4.1 ± 2.2 evts (2.1 s) hcDD “

  37. What is this one? • Too narrow to be the same as the wJ/y peak at 3940 MeV • cc0 or hc most likely charmonium states • DD* signal rules against cc0 • Mass is a little low for hc • DM(3S) would be ≈ 100MeV • can DM(3S) > DM(2S) ‘ “ ‘ “

  38. Summary • hc’ established DM(2S)<DM(1S) • G(X(3872)p+p-p0J/y = G(X(3872) p+p-J/y) • Good for molecules; bad for charmonium • Broad near-threshold wJ/y peak • too broad for charmonium • Too light for cc-glue hybrid? • theshold interaction involving a J/y ? • 4th peak seen in e+e- J/y X • Evidence for it in DD* (rules out cc0’) • If it is the hc”, DM(3S) > DM(2S)

  39. X(3872)p+p-p0J/y “Y”(3940)wJ/y 3D2?? hc?? e+e-J/y “X”(3940) B-factory data

  40. M(K3p) for signal bin Events at M(3p)=775 MeV Kinematic limit would peak here

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