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CLEO-c and R measurements

THE CLEO COLLABORATION Albany • CalTech • Carnegie Mellon Cornell • Florida • Harvard Illinois • Kansas • Minnesota Oklahoma • Ohio State • Pittsburgh Purdue • Rochester • SMU Syracuse • UC San Diego • Vanderbilt Wayne State +. CLEO-c and R measurements. Lawrence Gibbons

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CLEO-c and R measurements

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  1. THE CLEO COLLABORATION Albany • CalTech • Carnegie Mellon Cornell • Florida • Harvard Illinois • Kansas • Minnesota Oklahoma • Ohio State • Pittsburgh Purdue • Rochester • SMU Syracuse • UC San Diego • Vanderbilt Wayne State + ... CLEO-c and R measurements Lawrence Gibbons Cornell University

  2. The Main CLEO-c Program 2 0 0 2 Prologue: Upsilons ~1-2 fb-1 ea. Y(1S) ,Y(2S), Y(3S)… Spectroscopy, Matrix Elements, Gee 10-20 times existing world’s data In the works 2 0 0 3 Act I: y(3770) -- 3 fb-1 30M events, 6M tagged D decays (310 times MARK III) 2 0 0 4 Act II: √s ~ 4100 -- 3 fb-1 1.5M DsDs, 0.3M tagged Ds decays (480 times MARK III, 130 times BES II ) 2 0 0 5 Act III: y(3100) -- 1 fb-1 1 Billion J/y decays (170 times MARK III 20 times BES II)

  3. What is CLEO/CESR-c? • CESR modified for s ~ 3–5 GeV • CLEO solenoid 1.5T  1T • Long damping time () problematic •  add wigglers to decrease  • Wiggler’s now being prototyped • Expected machine performance: • Best estimate: 3x1032 cm-2 s-1@ 1.885 GeV • Wiggler-dominated radiation: L ~ E2 • Ebeam/Ebeam ~ 8x10-4 at J/ • Use existing CLEO III detector

  4. Anticipated schedule • July ‘01: install superconducting quads • Low E machine studies + 10 GeV physics can coexist • Nov ‘01: (nS) running • ~Oct ‘02: CLEO-c/CESR reconfig. • silicon  drift chamber replacement • additional RF cavities • wiggler installation • Spring ‘03: charm running • Weak physics: (3770), DSDS (~4.1 GeV) • QCD: J/  • 3-4 year program for charm running • Main 3 yr program plus: •  threshold (m), cc threshold (pK), ’, R “spot checks”, (nS) w/ n>4

  5. CLEO-c and R • Direct measurement: systematics limited • CLEO s=10.58 GeV: systematics ~ 2% • ISR, luminosity dominate • Minimal: points near J/, (3770), DSDS • More detailed proposals: • 100 pb-1 from J/  5 GeV • 100 MeV steps below (3770), 20 MeV above • 104 hadronic events / step • 50 pb-1 from 5 GeV  7 GeV • Crystal Ball / Mark I discrepancy region • 100 MeV steps, also 104 events / step

  6. Charm spectroscopy: 3.7-5 GeV • Above DD threshold • Study DD, D*D, D*D*, D**D final states, including angular distributions • 2 MeV steps @ 105 events / step • 130 days of running • Radiative returns at (3770): • ∫Rds crosscheck of dedicated expt’s • 1 < s < 3 GeV: • ~30,000 fully contained events for 3 fb-1 • Recent BABAR,KLOE studies  statistical feasibility • SYSTEMATICS < 5%? …under study • Radiation function + acceptance • FSR/ISR interference …

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