1 / 6

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

rex
Télécharger la présentation

CLEO-c and R measurements

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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 …

More Related