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Charm results from CLEOIII, CLEO-c

. K -. K +.  -. e +. Charm results from CLEOIII, CLEO-c. data. Steven Dytman Univ. of Pittsburgh. OUTLINE: Introduction to CLEO D 3-body decays Semileptonic D decay. First results from 60pb -1 CLEO-c data set taken fall 2003/winter 2004!. (3770) D 0 D 0

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Charm results from CLEOIII, CLEO-c

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  1. K- K+ - e+ Charm results from CLEOIII, CLEO-c data Steven Dytman Univ. of Pittsburgh • OUTLINE: • Introduction to CLEO • D 3-body decays • Semileptonic D decay First results from 60pb-1 CLEO-c data set taken fall 2003/winter 2004! (3770)D0D0 D0K+ -, D0K -e+

  2. What is CLEO? • e+e- symmetric collider at • cm energy 7-10.6, 3-4.6 GeV • Standard HEP detector • CLEO III had Si vertex detector • CLEO-c has drift chamber • CESR-c has 12 wigglers • added for low energy beams. CLEO III e- Collaboration= Carleton, Carnegie Mellon, Cornell, Florida, George Mason, Illinois, Kansas, Northwestern, Minnesota, Pittsburgh, Puerto Rico, Purdue, Rochester, RPI, SMU, Syracuse, Vanderbilt and Wayne State. e+ ~4m

  3. New drift chamber (ZD) for vertexing

  4. Techniques • B factories, pp colliders • Tag with D*+→D0 p+ , D*-→D0p-. • Background suppression excellent→poor • Charm factory, y(3770) → D0D0 (~rest) • Tag with common decay, e.g. D0→K-p+ • threshold cleaner, smaller cross section • Exploit quantum correlations CLEO III data: CLEO-c data:

  5. Charm Dalitz Plot Analyses • New & improved hadronic BF • Study light meson properties • Search for DD mixing, CP violation x=Dm/G y=DG/2G Rmix=√x2+y2 CLEO II: D→Ksp+p-

  6. CLEO II.V: D →Kshp0 a0(980) • First observation of this mode! • Small sample (155 events), • but very clean. • With more statistics, will • have impact on k, s puzzle • Accepted for PRL K0* a0(980)

  7. How do B and D factories compare?e.g. D0→K-p+p0 (BF=13.0%) • CLEO-c, first analysis • 14590 events/50 pb-1 • 3 fb-11.15M • CLEO II pub., PRD 63 (2001) • 7070 events/4.7 fb-1 • 1 ab-1 1.5M K*0 data data r+ K*-

  8. CLEO-c status, goals • ~3fb-1 (each) at y(3770)→DD, e+e- →DsDs • Analyses underway or planned • D → Ksp+p-, Ksp0p0, D+→K-p+p+ • D → K-p+p0, K-K+p0, K-p+(K+p-) • D(D)→ K-e+n(K+e-n) • Goals • Settle existence of k (proposed L=0 Kp resonance) • strong phase, cosd< 0.05 • √ 2Rmix=√x2+y2<2% (95% c.l.) • |y|<0.6% (95% c.l.) CLEO-c goal

  9. l Vus/Vus =1% l Vud/Vud 0.1% Vub/Vub 15% e B n n K n n p p  Vcb/Vcb 5% Vcd/Vcd 7% Vcs/Vcs =11% l l D n B n l D K D n p Vtb/Vtb 29% Vtd/Vtd =36% Vts/Vts 39% W t b Bd Bd Bs Bs Big goal is to constrain CKM matrixvarious labs, theory all have a role CLEO-c + Lattice QCD +B factories CLEO-c + Lattice QCD +B factories + ppbar CLEO-c

  10. theory D0 pln phenom Lattice QCD Phenom is interesting, incomplete Lattice QCD (Okamoto, 2004) Interesting interplay of weak and strong interaction! Form factor D0 pln q2 (GeV2)

  11. PDG on D semileptonic decays • D → K-e+n 3.58  0.18% • D → K-m+n 3.19  0.17% • D → p-e+n 0.36  0.06% Cabibbo suppr. • D → K*-e+n 2.15  0.35% vector • D → r-e+n ???? vector • Data on Form factors sketchy CLEO3 has new results (final) for D → p-e+n CLEOc has preliminary results for all channels!

  12. CLEO III D → (K,p)en D→K-e+n D→p-e+n • Best BF ratio meas., • first form factor result • for D→pen • Results subm. to PRL p K K p DM=M(pshln)-M(hln) D→p-e+n D→K-e+n

  13. CLEO-c tagging Modes: K-p+, K- p+p0, K-p+p0p0, K-p+p+p-, Ksp+p-, Ksp+p-p0, Ksp0, p-p+p0, K-K+ SBF=44.9% S(BF*etag)=2*12.8% =25.6% Beam energy constrained mass Total= 59432±364 tagged events

  14. CLEO-c has better event definition e.g., D → pen D0→pen p mistag K D→Ken DM(GeV) Emiss-pmiss(GeV) CLEO-c: 60 pb-1 at y(3770) tag 9 hadronic decay modes CLEO III: 6.7 fb-1 at (4S) tag pslow Excellent p/K with RICH 109±11 events

  15. CLEO-c D → Ken, K*en D→K*en: N=88.0 ±9.7 D→Ken: 1405±39 events

  16. Something new!D→r semileptonic decay N(D0→r-e+n)=30.1±5.8

  17. BF with CLEO-c now (60 pb-1) CLEO III: 0.082 ±0.006 ±0.005

  18. D → K-e+n D → K*-e+n D → p-e+n D → r-e+n D+→ K0e+n D+→ K0*e+n D+→ p0e+n D+→ r0e+n Ds→ K0e+n Ds→ K*0e+n Ds→ fe+n CLEO-c projected (3fb-1) q2 dist. now sBF/BF PDG CLEO-c goal • BF improvement dramatic • FF, Vcd, Vcs separated • with lattice FF(0). • q2 resolution~0.03 GeV2 • dVcd/Vcd1.7%

  19. Summary, Outlook • New CLEO II.V, III results • Observe D→Kshp0 decay BF for first time (h is unusual) • D→pln and D→Kln form factor meas. (first time for p) • CLEO-c results are coming quickly!! • D→pen,Ken, K*en BF measured, accuracy ≈ PDG • D→ren BF measured for first time • High quality form factor, Vcd, Vcs meas. to come • CLEO-c and B factories are complementary • Statistics will be similar with 3 fb-1 and 1 ab-1, resp. • CLEO-c has advantage where bkgd suppression important

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