CLEO-c Status & Prospects

CLEO-cStatus & Prospects David Asner University of Pittsburgh yDo Do , DoK-p+ K+ K- p+ p- Beauty ’03 – 9th International Conference on B-Physics at Hadron Machines

CLEO-c Physics Program Charm measurements Precise charm absolute branching ratio measurements Leptonic decays: decay constants fD and fDs Semileptonic decays: form factors, Vcs, Vcd, test unitarity Hadronic decays: normalize B physics QCD studies Precise measurements of quarkonia spectroscopy Searches for glue-rich exotic states: Glueballs and hybrids Probes for Physics beyond the Standard Model D-mixing, CP Violation, rare D decays Possible additions to Run Plan y’ spectroscopy, t threshold, Lc threshold, R scan David Asner – University of Pittsburgh

The Cornell Electron Storage Ring 12 additional wigglers to improve transverse cooling E = 1.5 – 5.6 GeV David Asner – University of Pittsburgh

s(nb) L ~ 1.1030 (~BES) Ebeam CESR-c CESR: L((4S)) = 1.3.1033 cm-2 s-1 One day scan of y’: yJ/y  J/y  CESR-c: Expected machine performance: D Ebeam ~ 1.2 MeV at J/y David Asner – University of Pittsburgh

The CLEO-c Detector Drift chamber/ Inner tracker 93% of 4p sp/p = 0.35% @ 1 GeV dE/dx: 5.7% p @ min-Ionizing Superconducting Solenoid coil Barrel calorimeter Ring Imaging Cherenkov detector Drift chamber Ring Imaging Cherenkov 83% of 4p 87% Kaon ID with 0.2% p fake @ 0.9GeV Inner tracker / Beampipe Endcap calorimeter Iron polepiece Cesium Iodide Calorimeter 93% of 4p sE/E = 2% @ 1GeV = 4% @ 100MeV Muon chambers SC quad pylon SC quads Data Acquisition Event size = 25kB Thruput < 6MB/s Rare earth quad Muon system 85% of 4p for p >1 GeV Magnet iron Trigger - Tracks & Showers Pipelined Latency = 2.5ms David Asner – University of Pittsburgh

6 layers 2cm < R < 12cm All stereo 300 channels NEW - Inner Drift Chamber Replace Silicon Vertex Detector with Inner Drift Chamber David Asner – University of Pittsburgh

y(3770) Hadronic Event David Asner – University of Pittsburgh

Run Plan 2002 – 2003 Epilogue & Prologue Upsilons ~1-2 fb-1 each at(1S), (2S), (3S), and ~½ fb-1 at (5S) Spectroscopy, matrix elements, Gee, hb, hc Last run of CLEO III @ (5S) on March 3rd 2003 y(3770) ~3 fb-1 (y(3770)  DD) 30 million DD events, 6 million tagged D decays 310 times MARK III data Year 1 C L E O - c s ~ 4140 MeV ~3 fb-1 1.5 million DsDs events, 0.3 million tagged Ds decays 480 times MARK III data, 130 times of BES data Year 2 y(3100) ~1 fb-1 1 billion J/y decays 170 times MARK III data, 20 times BES II data Year 3 David Asner – University of Pittsburgh

CLEO-c Signature y(3770) events are simpler than (4S) events! (4S) event y(3770) event The demands of doing physics in the 3 - 5 GeV range are easily met by the existing detector BUT B factories: 400 fb-1 ~500M cc by 2005 What is the advantage of running at threshold? D0K-+D0  K+e- • Charm events produced at threshold • are extremely clean • Large cross section, low multiplicity • Pure initial state: no fragmentation • Signal/Background is optimum at • threshold • Double tag events are pristine • These events are the key to make • absolute BR measurements • Neutrino reconstruction is clean • Quantum coherence aids D mixing & • CP violation studies David Asner – University of Pittsburgh

Vub / Vub= 17% 5% Vus / Vus = 1% Vud / Vud = 0.1% l- l- e- n n K n B n  p p Vcs/Vcs=11%  1.6% Vcd / Vcd = 7%  1.7% Vcb / Vcb = 5%  3% l- l- l- D B D n n n p D K Vts / Vts = 39%  5% Vtd / Vtd = 36%  5% Vtb / Vtb = 29% W Bd Bd Bs Bs t b Precision Flavor Physics Goal for the decade: High precision measurements of all CKM matrix elements & associated phases – over-constrain the “Unitary Triangles” Inconsistencies  New Physics ! CKM Matrix Current Status: Potential CLEO-c impact Many experiments will contribute: CLEO-c will enable precise 1st column unitarity test & new measurements at B-Factories/Tevatron to be translated into greatly improved CKM precision David Asner – University of Pittsburgh

# of X # of D tags Absolute Charm Branching Ratios Double tag technique: Almost zero background in hadronic tag modes Measure absolute B(D  X) with double tags B = D- tag D+  K-p+p+ Monte Carlo CLEO-c: potential to set absolute scale for all heavy quark measurements 50 pb-1 ~1,000 events  x2 improvement (stat) on D+ K-p+p+ PDG dB/B David Asner – University of Pittsburgh

bkgd DM = M(mng) – M(mn) / GeV Comparison: B Factories & CLEO-c CLEO: fDs: Ds*  Dsg with Ds mn CLEO-c 3 fb-1 B Factory 400 fb-1 PDG Statistics limited Systematics & Background limited Error (%) B(Ds fp ) fD fDs Monte Carlo CLEO-c Ds mn B(D+ Kpp ) B(D0 Kp ) David Asner – University of Pittsburgh

Semileptonic Decays |VCKM|2 |f(q2)|2 CLEO-c Monte Carlo D0 pln Tagged Events & Low Bkg D0 pln dG/dpp Monte Carlo D0 Kln pp Lattice Emiss - Pmiss D0 pln First time measurement of complete set of charm PS  PS & PS  V absolute form factor magnitudes and slopes to a few % with almost no background in one experiment Stringent test of theory! dG/dpp pp David Asner – University of Pittsburgh

CLEO-c Impact on Semileptonic dB/B 1: D0 K- e+n 2: D0 K*- e+n 3: D0 p- e+n 4: D0 r- e+n 5: D+ K0 e+n 6: D+ K*0 e+n 7: D+ p0 e+n 8: D+ r0 e+n 9: Ds K0 e+n 10: Ds K*0 e+n 11: Ds f e+n PDG CLEO-c CLEO-c will make significant improvements in the precision with which each absolute charm semileptonic branching ratio is known! David Asner – University of Pittsburgh

CLEO-c Probes of QCD • Verify tools for strongly coupled theories • Quantify accuracy for application to flavor physics • y and  spectroscopy • Masses, spin fine structure • Leptonic widths of S-states • EM transition matrix elements  resonances done in fall 2001 - fall 2002 ~4 fb-1 J/y running in 2005 anticipate 1 billion J/y • Uncover new forms of matter – gauge particles as constituents • Glueballs G = | gg  Hybrids H = | gqq  • The current lack of strong evidence for these states is a fundamental issue in QCD  Requires detailed understanding of the ordinary hadron spectrum in the 1.5 – 2.5 GeV mass range Confinement, Relativistic corrections Rich calibration and testing ground for theoretical techniques  apply to flavor physics Wave function Tech: fB,KBK fDs Form factors Study fundamental states of the theory David Asner – University of Pittsburgh

c X J/ c  Gluonic Matter • Many Glueball sightings without confirmation • CLEO-c 1st high statistics experiment with modern 4p detector covering the 1.5 - 2.5 GeV mass range • Radiative J/y decays are ideal glue factory • anticipate 60 million J/y radiative decays • Branching ratios of f0triplet from WA102 (D. Barberis et al., Phys. Lett.B 479 59 (2000)) • Input for glueball - scalar mixing models(F. Close et al., Eur. Phys. J. C 21 531 (2001)) David Asner – University of Pittsburgh

CLEO-c Probes of New Physics • Rare charm decays: • D  l+l`- (GIM, Helicity), Xl+l`- (GIM) • Sensitivity: 10-6SM rate 10-19, 10-16  Search for New Physics • DD mixing: CKM & GIM Suppressed • B-factory + Fixed Target experiments exploit finite D lifetime • R(t) = e-t (RDcsd + RDcsdy`1/2 t + RMIXt2) y` = ycosd – xsind, x` = ysind + xcosd RMIX = ½(x2+y2) = ½(x`2 + y`2) • CLEO-c cannot measure D lifetime: Exploit quantum coherance • Sensitive to cosd ~ 0.07 and (2RMIX)1/2< 2% @ 95% C.L. David Asner – University of Pittsburgh

CLEO-c Probes of New Physics • CP violating asymmetries • Sensitivity: ACP < 0.01 for (3770)  e/m (CP), CP=K+K-,KSp0,KSw • Interference between amplitudes on Dalitz plots such as D KSp+p- may provide greater sensitivity to CPV • Intermediate states include • CP+: KS f0(600), KSf0(980), KSf0(1370) CP- : KSr, KSw • Uncorrelated D’s: CP conservation  interference between CP+ & CP- amplitudes integrates to zero • Correlated D’s: CP conservation  interference between CP+ & CP- amplitudes locally zeroH. Muramatsu et al. [CLEO Collaboration.], Phys. Rev. Lett. 89 251802 (2002). David Asner – University of Pittsburgh

CLEO-c Physics Impact Crucial Validation of Lattice QCD: Lattice QCD will be able to calculate with accuracies of 1 - 2%. The CLEO-c decay constant and semileptonic data will provide a “golden” & timely test . QCD & charmonium data provide additional benchmarks. World Average ~2005 (excluding CLEO-c) Assumes theory errors reduced by x2 World Average with CLEO-c Theory errors = 2% David Asner – University of Pittsburgh

CLEO-c Physics Impact • Absolute charm branching fractions contribute significant errors to measurements involving b’s. CLEO-c can resolve this problem. • Measuring the relative strong phase between D0K*+K- and D0 K*-K+ is • crucial to determining angle g with B KD0, D0 K*K. • J. A. Rosner & D. A. Suprun, Phys. Rev. D68 054010 (2003). • Improved knowledge of CKM elements, which is now not very good PDG CLEO-c Data and LQCD B Factory/Tevatron Data & CLEO-c Lattice Validation • The potential to observe new forms of matter – glueballs & hybrids – and • new physics – D mixing / CP Violation / rare decays – provides a • discovery component to the CLEO-c research program. David Asner – University of Pittsburgh

The CLEO-c Collaboration Carleton University Carnegie Mellon University Cornell University University of Florida George Mason University University of Illinois University of Kansas University of Minnesota Northwestern University University of Oklahoma University of Pittsburgh University of Puerto Rico Purdue University Rensselaer Polytechnic Institute University of Rochester Southern Methodist University Syracuse University University of Texas - Pan American Vanderbilt University Wayne State University The CLEO-c Collaboration David Asner – University of Pittsburgh

CLEO-c Status & Prospects