Cleo c and r measurements
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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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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

Cornell University


The main cleo c program

The Main CLEO-c Program

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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

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Act I: y(3770) -- 3 fb-1

30M events, 6M tagged D decays

(310 times MARK III)

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Act II: √s ~ 4100 -- 3 fb-1

1.5M DsDs, 0.3M tagged Ds decays

(480 times MARK III,

130 times BES II )

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Act III: y(3100) -- 1 fb-1

1 Billion J/y decays

(170 times MARK III

20 times BES II)


What is cleo cesr c

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


Anticipated schedule

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


Cleo c and r

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


Cleo c and r measurements

  • 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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