D-meson results from CLEO “Rumors of my death are exaggerated”. –2003: CLEO re-incarnated (phoenix-like) into 3-4 GeV electron- positron collider. –First “CLEO-class” detector at charmonium energies –Continuing nearly 30 year physics program Longevity>U2 (but <Rolling Stones) –Scheduled to take data into 2008; expect active physics analysis program for additional five yrs. Focus here on updated D +   (2005 pub.) plus recent results on semileptonic+hadronic D modes. THANKS TO DAVID ASNER, WERNER SUN AND ALEX SMITH, FROM WHOM I SHAMELESSLY LIFTED SLIDES WHOLESALE!

CLEO-c Detector/CESR-c Accelerator SVX CLEO III Ability to run at cms energies from J/  up to  (5S) Beam Energy (GeV) CLEO-III SVX Mini Drift Chamber CLEO-c  (3770) ’’ Simple conversion of detector from  (4S) to  (3770) running; CESR reconfiguration now prohibits return to Upsilon system. Si  low-mass tracking

Running at the  (3770) No extra energy for fragmentation particles –Known/coherent initial state –Clean neutrino reconstruction –Simple combinatorics Large cross section Good kinematic particle ID E cm ~  (3770)E cm ~  (4S) CLEO IIICLEO-c

Overview of D-tagging techniques e  e    (3770)  DD Kinematics analogous to  (4S)  BB:  (M BC ) ~ 1.3 MeV, x2 with  0  (  E) ~ 7—10 MeV, x2 with  0 Single tag (ST): n i = N DD B i  i Double tag (DT) : n ij = N DD B i B j  ij –Ratio + algebra allows extraction of BR; eff cancels to 1 st order. Take advantage of low multiplicity, low backgrounds. Example: MC tracking, K 0 S, and  0 efficiency systematics: –Missing mass (MM) technique to compare data and MC. –Fully reconstruct entire event, but deliberately leave out one particle. –Fraction of MM peak where the last particle is found = efficiency.

K not found (MC) K found (MC) Example: K  eff from D 0  K   +  ≈ 91% in fiducial volume DKDK D   D  KXX Same tracking eff technique in earlier CLEO-II D  Kpi analysis

Leptonic Decays: D + →μ + ν Compare with lattice QCD predictions!

f D+ from Absolute Br(D +    ) 1 additional track (  ) Compute missing mass 2 : peaks at 0 for signal Tag D fully reconstructed Mark III PRL 60, 1375 (1988 ) ~9 pb tags ~33pb tags S=3 B=0.33 BESII Phys.Lett.B610: , (2005)

D Leptonic Decays: D +   + Many large BR tag modes –~25% efficiency for reconstructing a tag Signal is very pure after tagging Roughly 30x BES sample Getting the ABSOLUTE branching fractions... “Other side D” tag e+e+ e-e- Signal D ++ Tag D Tag D decay modes: – Fit for (“missing mass”) 2 :

Compare with previous results & Lattice Calcs Since f D measures w.f. overlap at origin, expect comparable (slightly smaller than) f Ds

Semileptonic Decays c e+e+ e W+W+ |V cs |, |V cd |  Test LQCD on shape of f + (q 2 )  Use tested Lattice for norm.  Extract |V cd |  Extract B(D  Xe )  D   FF related to B   FF by HQS  Precise D   FF’s can lead to reduced  theory in |V ub | at B factories  Same holds for D  Vln, except 3 FF’s enter

Exclusive Semileptonic D Meson Decays Reconstruct one D meson in hadronic tagging channel – Reconstruct the remaining observable tracks Use the missing energy (E miss ) and missing momentum (|P miss |) in the event to form kinematic fit variable for the neutrino Technique: From fit of M bc and  E for number of tags Signal component from fit to variable U From Monte Carlo/Data Both flavors combined:

K-K- -- e+e+ K+K+ Semileptonic Decays Tagging creates a single D beam of known 4-momentum Semileptonic decays are reconstructed with no kinematic ambiguity Hadronic Tags: 32K D + 60K D 0 Events / ( 10 MeV ) (~1300 events) U = E miss – |P miss | (GeV)

D + semileptonic results (including omega!) D 0 semileptonic results – note wrt PDG

M BC (log scale) for ST modes: D+D Double Tag Analysis gives Had BR’s ModeN D (10 3 )  D  (%) KK 5.11± ± ±0.2 K   9.51± ± ±0.1 K  7.44± ± ±0.1 K  7.56± ±0.1 K   2.45± ± ±0.1 K0sK0s 1.10± ± ±0.3 K 0 s   2.59± ± ±0.1 K 0 s  1.63± ± ±0.1 KK  0.64± ± ±0.4 All D 0 DT 2484 ± 51 All D + DT 1650 ± 42

Double Tag Analysis: Fit Results Fit includes both statistical and systematic errors (with correlations) [arXiv:physics/ ]. Precision comparable to PDG WA.  (systematic) ~  (statistical). –Many systematics measured in data, will improve w/time. Simulation includes FSR, so we measure B (final state + n  ). –Using efficiencies without FSR correction would lower B. N DD includes continuum and resonant production. ParameterValue no FSR NDDNDD (2.01±0.04±0.02)x % B(K+)B(K+) (3.91±0.08±0.09)%-2.0% B(K+)B(K+) (14.9±0.3±0.5)%-0.8% B(K++)B(K++) (8.3±0.2±0.3)%-1.7% ND+D-ND+D- (1.56±0.04±0.01)x % B(K++)B(K++) (9.5±0.2±0.3)%-2.2% B(K++0)B(K++0) (6.0±0.2±0.2)%-0.6% B(KS+)B(KS+) (1.55±0.05±0.06)%-1.8% B(K0S+0)B(K0S+0) (7.2±0.2±0.4)%-0.8% B(K0S+-+)B(K0S+-+) (3.2±0.1±0.2)%-1.4% B(K+K+)B(K+K+) (0.97±0.04±0.04)%-0.9% (D0D0)(D0D0) (3.60± ) nb-0.2% (D+D-)(D+D-) (2.79± ) nb-0.2%  (+-)/  (00) 0.776± %

Comparison with PDG 2004 Measurements and errors normalized to PDG. PDG global fit includes ratios to K -  + or K -  +  +. No FSR corrections in PDG measurements. Our measurements also correlated (statistics and efficiency systematics). B(D0  K-+)B(D0  K-+) B (D +  K -  +  + ) Other direct meas. Overall C.L 25.9%

M BC distributions in  E signal region and  E sidebands D → n(  + ) m(  0 ) Study Cabibbo-suppressed D decays with single tags only. –Double tag technique not as profitable—statistics too low. –Normalize B s to ref. modes. MC tuned to match  mass spectra in data. Bkgnd from Cabibbo-favored decays with K 0 S →  +  -,  0  0. –Veto M(  ) near K 0 S mass. D0D0 D+D+ M(+-)M(+-) M(00)M(00) Reference modes

X-checked with search including   

What’s coming? Results on CP-modes, Dalitz analyses & rare decay modes, Via scan, have found “optimal” run energy for production of D s mesons…beginning to accumulate tag sample; apply D-reconstruction machinery to D s, Immediate D s goals: high-precision msrmnt of normalizing mode (  semileptonic modes (CF and CS), rare modes “tailored” for threshold msmrnts (p-nbar, e.g.)

Tags Invariant Masses from the 4160 & the 4180 MeV DATA 233   1897    5370  1082  1556  15 Total # of Tags = 1219 ± 67(stat)   ss   K * K -        

Impact of CLEO-c Measurements Calibration and validation of Lattice QCD Test theoretical form factor calcs. and models –Impacts prediction of form factors for B meson decays Measurements of |V cs | and |V cd | Improved decay constants f B possible from CLEO-c f D measurement + LQCD Improved measurement of many important normalization modes e+e+ W+W+ Electroweak Physics Strong Physics

CLEO-c Impact on Unitarity Triangle Now: Theory uncertainties dominate With few % theory errors made possible by CLEO-c and 500 fb -1 each from the B factories:

CLEO-c + Lattice QCD +B factories + ppbar CLEO-c + Lattice QCD +B factories CLEO-c Future of Precision Flavor Physics  Vub/Vub~15  5% l B  l D   Vcd/Vcd~7  1.1% l D   Vcs/Vcs~16  1.4% l B D  Vcb/Vcb~5  3% BdBd BdBd  Vtd/Vtd~36  5% BsBs BsBs  Vts/Vts~39  5%  Vtb/Vtb~29%  Vus/Vus~1%   l  Vud/Vud~0.1% e p n t b W Goal: Measure all CKM matrix elements and associated phases in order to over-constrain the unitary triangles