1. XLIId RENCONTRES DE MORIOND ELECTROWEAK INTERACTIONS AND UNIFIED THEORIES CLEO-c Results Basit Athar March 10 - 17, 2007 University of Florida CLEO Collaboration

2. La Thuile Mar. 10-17B. Athar - Moriond EW'072 Outline Program Overview Program Overview Physics Motivation Physics Motivation Pure leptonic decays Pure leptonic decays D & D s Decay constants D & D s Decay constants Semi Leptonic decays Semi Leptonic decays Exclusive decay - CKM & FF Exclusive decay - CKM & FF Rare Decays Rare Decays

3. La Thuile Mar. 10-17B. Athar - Moriond EW'073 CLEO-c Program 4170 MeV: D s decay Leptonic decays. Leptonic decays. Hadronic branching fractions. Semi-Leptonic decays. 3770 MeV: D decay (Semi) Leptonic decays. (Semi) Leptonic decays. Hadronic branching fractions. Dalitz Analysis. D-mixing. Quantum Correlation in D system. 3686 MeV:  (2S),  c,J/ ,h c,  c 3970-4260 MeV: Ds scan & Y(4260). 4170 MeV: D s decay Leptonic decays. Leptonic decays. Hadronic branching fractions. Semi-Leptonic decays. 3770 MeV: D decay (Semi) Leptonic decays. (Semi) Leptonic decays. Hadronic branching fractions. Dalitz Analysis. D-mixing. Quantum Correlation in D system. 3686 MeV:  (2S),  c,J/ ,h c,  c 3970-4260 MeV: Ds scan & Y(4260). Charm threshold at various energies ~28 10 6  (2S) 60pb-1 3.97-4.26 GeV 195+130 pb -1 4170 GeV 281 pb -1  (3770)

4. La Thuile Mar. 10-17B. Athar - Moriond EW'074 Motivation CLEO-c provides a unique environment for studying Leptonic & Semi-Leptonic charm decays. Modern detector at charm threshold. Good tracking & particle identification & EM calorimetry Low track multiplicity - 5 to 6 tracks/event Pure Leptonic decays: Determine f D and f Ds use them to test LQCD models. Help calibrate LQCD for f B and f Bs predictions. Semi Leptonic decays: Form factors and QCD checks. Assuming V cs & V cd known. Precision measurements V cd & V cs. Trusting LQCD predictions.

5. La Thuile Mar. 10-17B. Athar - Moriond EW'075 Leptonic decays c and q annihilation is proportional to overlap function. D l  = 2.35x10 -5 :1:2.64 (e  ) D → l  = 2.35x10 -5 :1:2.64 (e  ) D s l  = 2.5x10 -5 :1:9.7 (e  ) D s → l  = 2.5x10 -5 :1:9.7 (e  ) _ (s) SM

6. La Thuile Mar. 10-17B. Athar - Moriond EW'076 Ds-Ds- D s *+ 4170 e+e+ e-e-  -- K+K+ Ds+Ds+  K-K- D & D s tag Method DD Tag: MarkIII pioneered Dtag method of DD production at threshold and used by CLEO and BESII D s * D s Tag: Tag one in a D s hadronic mode Add a photon Signal may be from D s or D s * Form a  2 with both hypothesis and keep the best. Look for signal in missing mass.  ” D-D- D+D+ e+e+ e-e-  -- -- K+K+ D s *- 4170 e+e+ e-e-  Ds+Ds+  Ds-Ds- -- K+K+ K-K- _ _ _ D TAG D s TAG

7. La Thuile Mar. 10-17B. Athar - Moriond EW'077 D - Invariant mass D + →    + →    Two s and pion in the final state. Look for pion opposite to D tag and calculate Missing mass squared. MM 2 for   will not peak at 0 but rather be spread out. CLEO-c L= 281 pb -1 160K Single Tags ”” D-D- D+D+ e+e+ e-e-  -- -- K+K+  MM 2

8. La Thuile Mar. 10-17B. Athar - Moriond EW'078 D + →  + 12 signal 8 signal E CC < 300 MeV E CC > 300 MeV D + →   K L PRD 73, 112005 (2006) Select  tracks (from  + ) in two MM 2 regions based on calorimeter (CC) info: Interactions in calorimeter ● E CC < 300 MeV minimum interacting   &  + ● E CC > 300 MeV interacting  + B(D + →   ) < 2.1  10 -3 (90% CL) Using CLEO-c B(D + →   ) = (3.5±1.4±0.6)x10 -4 SM: B(D + →   ) = (1.1 ± 0.2)  10 -3 [B(D + →   )/B(D + →   )] meas [B(D + →   )/B(D + →   )] SM < 1.8 (90% CL) D + →   ”” D-D- D+D+ e+e+ e-e-  -- -- K+K+ 

9. La Thuile Mar. 10-17B. Athar - Moriond EW'079 D s Invariant masses K-K+p+K-K+p+ KsK+KsK+ hh hh f r + hr + K * K * from K s K       Detect all particles except A kinematic fit is used Improve resolution 2  cut on “tagged D s “ mass Total # of D s Tags: 19185±325(stat.) Combine  with the selected D s tags. D s *- 4170 e+e+ e-e-  Ds+Ds+  Ds-Ds- -- K+K+ K-K- Ds-Ds- D s *+ 4170 e+e+ e-e-  -- K+K+ Ds+Ds+  K-K- 195 pb -1

10. La Thuile Mar. 10-17B. Athar - Moriond EW'0710 MC: D S →  + MC: D S →  + D s Missing Mass 2 Look at the recoiling mass against the ”8 D s ” tag modes & the . Total # of D s tags after MM *2 selection: 11880±399(stat.) tags Look for  +  and  + signal at the same time. Look at the recoiling or 2 All 8 Tag modes

11. La Thuile Mar. 10-17B. Athar - Moriond EW'0711 Electron Sample DATA 200/pb <0.3GeV in CC DATA 200/pb >0.3GeV in CC 64 events 24 events 12 events Case (i) Case (ii) CLEO preliminary E CC < 300 MeV E CC > 300 MeV D S →  +  + Three cases I. Track E cc < 300 MeV ( ,  ) accepts ~99%   & ~60%  + II. Track E cc > 300 MeV (  ) accepts ~1%   & ~40%  + III. Track E cc consistent with e. Cases 1&2 allow simultaneous study of D S →  +  24 events in case (i) 12 events in case (ii) No D S → e + seen in case (iii)

12. La Thuile Mar. 10-17B. Athar - Moriond EW'0712 100 events Sum of case (i) & case (ii)  signal line shape CLEO preliminary    K L D S →   &   D S →      [Case (i) + Case (ii)] Total of 36 signal, 5 bkgd events B(D S →   ) = (7.1±1.4±0.3)% [B(D S →   ) = (6.4 ± 1.5)% PDG06] + + D S →   [Case (i)] 64 signal, 2 + 5 bkgd events, B(D S →   ) = (0.66±0.09±0.03)% + + Sum  signal MM 2 < 0.2, B eff (D S →   ) = (0.66±0.08±0.03)% B(D S →   ) = (0.61±0.19)% PDG06 D S →  e  [Case (iii)] No events in signal region B(D S →  e  ) <1.3  10 -4 (90% CL) + + + Use SM to for  bkg near MM 2 =0 Use SM for  bkg near MM 2 =0 5

13. La Thuile Mar. 10-17B. Athar - Moriond EW'0713 Measuring D S + →  +  + →e + Three s in the final state B(D S + →  +  B  + →e +  1.3%  is “significant” compared with expected B(D S + →Xe +  Analysis Technique Find Ds tag and e+ - no need to find  from D s * No extra track E cc < 400 MeV Summary B(D S →   ) = (6.3 ± 0.8 ± 0.5)% from   → e +  analysis B(D S →   ) = (8.0 ± 1.3 ± 0.4)% from   →   analysis extra Complimentary Analysis

14. La Thuile Mar. 10-17B. Athar - Moriond EW'0714 f Ds Summary Weighted CLEO-c Results: f Ds = (280 ± 12 ± 6) MeV, Using the CLEO-c f D result, f D = (223 ± 17 ± 3) MeV, Ratio: f Ds /f D = 1.26 ± 0.11 ± 0.03 LQCD: f Ds /f D = 1.24 ± 0.07 D s   : f Ds = (281 ± 19 ± 7) MeV D s    and      : f Ds = (296 ± 29 ± 12) MeV D s    and     e : f Ds = (278 ± 17 ± 12) MeV 280±12± 6 1.26±0.11±0.03

15. La Thuile Mar. 10-17B. Athar - Moriond EW'0715 Semi Leptonic Decays: CKM elements & Form Factor For any pseudoscalars (P) Propagator (W + ) q  transfer is defined as V = K* (ρ) s(d) c V c s(d) P = K (π) h Brown Muck l Best way to determine CKM elements is to study semileptonic decays

16. La Thuile Mar. 10-17B. Athar - Moriond EW'0716 D - Exclusive Semileptonic Decays 295  20 699  28 2910  55 6796  84 14397  1321347  49 5846  88450  29 Standard D-Tag Method Untagged reconstruction 281pb -1 - Two methods have 40% overlap K-K- -- e+e+ K+K+ Missing 4-Mom P visible =  P charge +  P neutral P miss = P event - P visible 

17. La Thuile Mar. 10-17B. Athar - Moriond EW'0717 Exclusive Branching Ratio Comparison D o → K - e + ν D o → π - e + ν (2006) Good consistency between two methods. LQCD precision lags experiment.

18. La Thuile Mar. 10-17B. Athar - Moriond EW'0718 Form Factor Fit Comparison(Tag) Modified Pole ModelSimple Pole Model Hill series expansion (Phys. Lett. B 633, 61 (2006))) 3 popular FF parameterizations methods D+→Kse+νD+→Kse+ν D0→K-e+νD0→K-e+ν D0→π-e+νD0→π-e+ν D+→π0e+νD+→π0e+ν --- Simple pole --- Modified Pole --- Series with 2 par  Series with 3 par  Data Data and Fit results are normalized to the fit results for the series parameterization with 3 parameters.

19. La Thuile Mar. 10-17B. Athar - Moriond EW'0719 Form Factor Fit Comparison(Untagged) All these models describe the data pretty well All these models describe the data pretty well

20. La Thuile Mar. 10-17B. Athar - Moriond EW'0720 DATA FIT LQCD DATA FIT CLEO preliminary LQCD Data-LQCD Comparison LQCD [ PRL 94, 011601 (2005)] f + (0)  pole Assume V cd = 0.2238 Assume V cs = 0.9745

21. La Thuile Mar. 10-17B. Athar - Moriond EW'0721 Vcd & Vcs Summary Tagged and untagged consistent. 40% of events are common to both analyses: DO NOT AVERAGE! Uncertainties: Experiment V cs ~2%, V cd ~4% - LQCD f + (0) prediction: 10% Combine |V cx |f + (0) values from fits  with unquenched LQCD f + (0) results  |V cs | and |V cd | Decay Mode |V cx | ± (stat) ± (syst) ± (theory) PDG/HF Value D   e  (tagged) 0.234 ± 0.010 ± 0.004 ± 0.024 D   e  (untagged) 0.229 ± 0.007 ± 0.005 ± 0.024 0.224 ± 0.012 D  Ke  (tagged) 1.014 ± 0.013 ± 0.009 ± 0.106 D  Ke  (untagged) 0.996 ± 0.008 ± 0.015 ± 0.104 0.976 ± 0.014 PRL 94, 011601 (2005) Unitarity constraint on the second row along with |V cb | =(41.0±0.6)x10 -3 (PDG) ∆ = 1 - (|V cd | 2 +|V cs | 2 +|V cb | 2 ) = 0.012 ± 0.18 Untagged

22. La Thuile Mar. 10-17B. Athar - Moriond EW'0722 Rare Semi Leptonic Decays U miss = E miss - P miss (GeV) Mode BR (10 -4 )  e + 12.9  1.9  0.7  K -     e + K 1 (1270)e + 2.9 +1.5 -1.0  0.5 2.2 +1.4 -1.0  0.2  e + 14.9  2.7  0.5 8.5 +4.5 -3.2 D 0  K -     e +  32.7  6.7 D +  e + 37.3  6.7 U miss = E miss - P miss (GeV 2 ) 13.3  4.0 * First observation

23. La Thuile Mar. 10-17B. Athar - Moriond EW'0723 Summary By March 2008 double our data sets Improve precision on Leptonic decay constants Improve precision on V cd and V cs. Understand the form factor shape better. Improve signal significance in RARE D decays. CLEO-c at Charm threshold Great place to do charm physics. 3770 & 4170 MeV

24. La Thuile Mar. 10-17B. Athar - Moriond EW'0724 Inclusive Semileptonic Results Consistent with the known exclusive modes saturating the inclusive branching fractions. modeBranching Fraction D 0  Xe + (6.46 ± 0.17 ± 0.13)%  i B i (D 0  Xe +  (6.1 ± 0.2 ± 0.2)% D +  Xe + (16.13 ± 0.20 ± 0.33)%  i B i (D +  Xe +  (15.1 ± 0.5 ± 0.5)% Consistent with isospin symmetry Extrapolated below 0.2 CLEO-c 281pb -1, DTagged hep-ex/0604044, subm to PRL Measure Br(D 0  Xe + ) & compare with the known hadronic modes. Precision lepton momentum spectrum measurement. Help in b  c  se cascade decay modeling. Compare  sl (D 0 )/  sl (D + )

25. La Thuile Mar. 10-17B. Athar - Moriond EW'0725 D  Vector l Decay H 0 (q 2 ), H + (q 2 ), H - (q 2 ) are helicity-basis form factors computable by LQCD A new factor h 0 (q 2 ) is needed to describe s-wave interference piece in K* l. Present in K* l Spectroscopic pole dominance H ± (q2), H 0 (q2) can be expressed in terms of vector and axial vector form factors. Helicity amplitudes

26. La Thuile Mar. 10-17B. Athar - Moriond EW'0726 D +  K * (K   + )e +  Form Factors Data fits spectroscopic poles well. M V =2.1 M A =2.5  222 ()qHq  222 ()qHq 222 0 ()qHq PRD 74, 052001 (2006) data (281 pb -1 ) – overlay (not fit)

27. La Thuile Mar. 10-17B. Athar - Moriond EW'0727 D →  e + Simultaneous fit to D +   0 e, D 0   - e R v = 1.40  0.25  0.03, R 2 = 0.57  0.18  0.06 Line is projection for fitted R V, R 2 Fixed background shape and signal tails from MC B(D 0   - e + )= (1.56  0.16  0.09)  10 -3 B(D +   0 e + )= (2.32  0.20  0.12)  10 -3 Isospin average:  (D 0   - e + ) = (0.41  0.03  0.02)  10 -2 ps -1 this analysis  (D 0   - e + ) = (0.44  0.06  0.02)  10 -2 ps -1 FOCUS PLB 637,32 (2006) Dtagged, 281/pb 1 st measurement of FF in Cabibbo-suppressed charm PS  V decay q2q2 cos   cos  e  No-interference MC describes data U miss (GeV) D +  →  0  e  U miss (GeV) D 0  →    e 

28. La Thuile Mar. 10-17B. Athar - Moriond EW'0728 Form-factor Parameterization General dispersion relation: Modified Pole: Series Expansion: Simple pole model Popular: LQCD extrapolations & Experimental extraction of SL FF Hill & Becher, Phys. Lett. B 633, 61 (2006)