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Semileptonic D Decays from CLEO and BELLE Yongsheng Gao Southern Methodist University (CLEO Collaboration) ICHEP04, Beijing, Aug. 16 ─ 23, 2004.

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Presentation on theme: "Semileptonic D Decays from CLEO and BELLE Yongsheng Gao Southern Methodist University (CLEO Collaboration) ICHEP04, Beijing, Aug. 16 ─ 23, 2004."— Presentation transcript:

1 Semileptonic D Decays from CLEO and BELLE Yongsheng Gao Southern Methodist University (CLEO Collaboration) ICHEP04, Beijing, Aug. 16 ─ 23, 2004

2 Southern Methodist Univ.Yongsheng Gao 2 ICHEP Abstract/Paper First CLEO-c Inclusive D 0,D + semileptonic Decays (ICHEP ABS11-0777, CLEO CONF 04-12) (ICHEP ABS11-0777, CLEO CONF 04-12) First CLEO-c Exclusive D 0 semileptonic Decays (ICHEP ABS8-0781, CLEO CONF 04-3) (ICHEP ABS8-0781, CLEO CONF 04-3) CLEO-III Exclusive D 0 semileptonic Decays (ICHEP ABS11-0780, CLEO CONF 04-14) (ICHEP ABS11-0780, CLEO CONF 04-14) BELLE Exclusive D 0 semileptonic Decays (ICHEP ABS11-0706, BELLE CONF 0457) (ICHEP ABS11-0706, BELLE CONF 0457)

3 Southern Methodist Univ.Yongsheng Gao 3 Introduction Introduction Outline First CLEO-c Semileptonic D Decay Results First CLEO-c Semileptonic D Decay Results – – Inclusive D 0  Xe +  D +  Xe + (ICHEP ABS11-0777) (ICHEP ABS11-0777) – – Exclusive D 0  K - e +  - e +   - e +, ρ - e + (ICHEP ABS8-0781, CLEO CONF 04-3) (ICHEP ABS8-0781, CLEO CONF 04-3) Future Outlook Future Outlook CLEO-III Semileptonic D Decay Results CLEO-III Semileptonic D Decay Results – – Exclusive D 0  K - l +  - l + (ICHEP ABS11-0780, CLEO CONF 04-14, Submitted to PRL) (ICHEP ABS11-0780, CLEO CONF 04-14, Submitted to PRL)

4 Southern Methodist Univ.Yongsheng Gao 4 Why Semileptonic D Decay? D 0  Xe +  and D +  Xe +  – – Inclusive semileptonic BR and spectrum D 0  K - e +,  - e +  etc: – – Form Factors, V cd, V cs and V ub

5 Southern Methodist Univ.Yongsheng Gao 5 CESR and CLEO Tracking: Drift Chambers Electron ID: CsI Cal. Hadron ID: RICH

6 Southern Methodist Univ.Yongsheng Gao 6 CLEO Data Samples ResonanceIntegrated Luminosity CLEO III ~  (4S) 9.2 fb -1 CLEO-c  (3770) 60 pb -1 Mass (GeV/c 2 )  (3770)  (2S)

7 Southern Methodist Univ.Yongsheng Gao 7 Event Reconstruction: D *+  + slow D 0  (K) l Observable:  M = M D* - M D0 CLEO III D 0  K - l + /  - l + ~7 fb -1 of CLEO-III data near  (4S) D 0  K l D 0  l D 0  K l 2% K-faking- , 87%  efficiency D 0  l K/  Separation Capability Essential!  M (GeV) No PID

8 Southern Methodist Univ.Yongsheng Gao 8 CLEO III D 0  K - l + /  - l + E687 1996 CLEO II 1995 Mark III 1988 CLEO III Existing Measurements: ~7 fb -1 CLEO III data near  (4S) Kl  l =0.082  0.006(stat)  0.005(sys) Submitted to PRL

9 Southern Methodist Univ.Yongsheng Gao 9  e Ke CLEO III D 0  K - l + /  - l + Submitted to PRL First Measurement

10 Southern Methodist Univ.Yongsheng Gao 10  (3770) ~  (4S) Charm at  (3770) vs ~  (4S) – – Large Cross-Section – – Low Multiplicity – – NO Fragmentation – – Kinematics Variables: – –“Background Free” ∆E = E b - E D U = E miss - P miss K-K- e+e+ K+K+ --

11 Southern Methodist Univ.Yongsheng Gao 11  K+K+ -- ee e+e+ D0D0  K -,  -,K *-,ρ - or X D0D0 e+e+ Unique Kinematics at  (3770) Tag No PID

12 Southern Methodist Univ.Yongsheng Gao 12 Fully Reconstructed D 0 (Tag) 60K fully reconstructed D 0 From 60 pb-1 at  (3770) Preliminary

13 Southern Methodist Univ.Yongsheng Gao 13 Electron Identification Radiative Bhabha E/p, dE/dx, RICH Preliminary

14 Southern Methodist Univ.Yongsheng Gao 14 Stat. Uncertainty ~0.5% PDG: BR = (6.75  0.29)% Stat. Uncertainty ~ 0.6% PDG: BR = (17.2  1.9)% CLEO-c DATA Electron Momentum (GeV/c) Number Of event /(50MeV/c ) CLEO-c DATA Corrected Electron Spectra D 0  Xe + D +  Xe + From 60 pb -1 of first CLEO-c data: Preliminary

15 Southern Methodist Univ.Yongsheng Gao 15 Crossfeed bw D 0  K - e +  - e +  M (GeV) 0.12 0.22 D 0  l D 0  K l ~  (4S) D 0  K - e + D 0  - e +  (3770) NO separation in ∆M ~  (4S): NO separation in ∆M WELL separated in U  (3770): WELL separated in U No PID

16 Southern Methodist Univ.Yongsheng Gao 16 CLEO-c: D 0  K - e + Results From 60 pb -1 CLEO-c data: Preliminary

17 Southern Methodist Univ.Yongsheng Gao 17 CLEO-c Exclusive D 0 Semileptonic D 0  K - e + D 0  K *- e + D 0  - e + D 0  ρ - e + Preliminary First Observation

18 Southern Methodist Univ.Yongsheng Gao 18 First CLEO-c Results Improved measurements of absolute Branching Fractions First Observation of D 0  ρ - e + Both Statistic/Systematic errors limited by the 60 pb -1 data! Expect ~3 fb -1 of CLEO-c data in one year! Preliminary

19 Southern Methodist Univ.Yongsheng Gao 19 Summary Many very precision charm results: Form factors, Absolute BR, CKM elements … “Background Free” at  (3770) Limiting Factor: 60 pb -1 of data sample!

20 Southern Methodist Univ.Yongsheng Gao 20 CLEO-c Outlook 2006 : MeV ~ 3 fb -1 1.5 million D s D s evts, 0.3 million tagged D s (480 times MARK III, 130 times BES) 2005:  (3770) ~ 3 fb -1 18 million DD evts, 3,6 million tagged D decays (150 times MARK III) 2007:  (3100), ~1 fb -1 &  (3686) ~ 1 Billion J/  decays (170 times MARK III, 20 times BES II) CLEO CCLLEEOOcCCLLEEOOc Many very precision charm results: Form factors, Absolute BR, CKM elements … CLEO-c Yellow Book, CLNS-01/1742

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