CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per...

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Klaus Honscheid, LP 99 1 CESR and CLEO Lepton Photon 99 Klaus Honscheid Ohio State University

Transcript of CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per...

Page 1: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 1

CESR and CLEO

Lepton Photon 99Klaus HonscheidOhio State University

Page 2: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 2

Where to “B” To measure a key CP parameter (sin(2β)) to ~ 10 % requires:

a few hundred B0→ J/ψKs events+ fully reconstructed, flavor tagged+ BR’s, efficiency, tagging…ð 30x106 BB events (Y(4S))

e+e- Annihilation

Hadro-Production

σ ~ 100 µb (Tevatron)S/N ~ 1/500

σ ~ 1 nbS/N ~ 1/3

Page 3: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 3

on 4S Cont. [fb-1]

CLEO II 3.1 1.6CLEO II.5 6.2 2.8

Total 9.3 4.4

CLEO Datasample

CESR Performance

Peak Luminosity: 8.5 x 1032 cm-2 s-1

Integrated 40 pb-1 (Day)Luminosity 750 pb-1 (Month)

4400 pb-1 (Year)

Page 4: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 4

CESR Performance

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Page 5: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 5

Superconducting RF• More Powerð 1 A beam current

• Less Impedanceð 4 RF cells vs. 20

ð Reduced Instabilities

• Higher GradientðShorter Bunches

• Installed

Expect to reach 2 x 1033 cm-2 s-1 sometime next Year.

CESR Upgrades

Superconducting Quads• Better focusð β* from 18 to 13 mm

• Spring 2000

Page 6: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 6

Page 7: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 7

Charged Particle Tracking

Charged Multiplicity ~ 10Typical Momentum ~ 700 MeV/c down to 100 MeV/c

Momentum Resolution = f(Length, Multiple Scattering)

CLEO II ⇒ CLEO III: 20 cm smaller radius (RICH)Final focus quads

Page 8: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 8

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Page 9: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 9

He:Propane Xo > 330 m60:40 Lorentz Angle (@ 1.5 T) < 46o

Ar:Ethane Xo = 165 m50:50 Lorentz Angle (@ 1.5 T) < 69o

Improved efficiencyImproved resolution122 µm -> 112 µm Improved dE/dx

Reduced Multiple Scattering

2.5 mm Rohacell with 20 µm Al skinsXo < 0.15%No support function

Inner Gas Seal

He based Gas MixturesResolution

Efficiency

Test Beam Results (CLEO II.5)

All B-Factories useHe-based drift chamber gases

Page 10: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 10

MovingDay

Endplate View

Page 11: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 11

Charged Particle Tracking

Page 12: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 12

Silicon Vertex Detector

4 Layers of double sided silicon detectors, 300 µm thick.Only active elements and minimal support material in detector fiducial regionNo support structure outside outermost silicon layer.Conical support structure to maximize acceptance.

Page 13: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 13

Read Out Electronics

Flex Cable511 channels50 µm pitch

Front End128 channels50 µm pitch150e + 5.5 e/pF

Back End (SVX-CLEO)128 channels50 µm pitch8-bit ADC, sparsifierserial output

R/C Chips128 channels50 µm pitch150 MΩ, 150 pF

Silicon Sensor27.0 x 53.2 mm2

511 strips per side50 µm r-f 100 µm z

• Up to 5 silicon sensors daisy-chained to one readout.• Radiation hard (100 kRad)• Very low noise, Viking based Front-End chip.• Back-End chip based on SVX II• BeO Hybrids mounted on copper cones (cooling)• S/N > 15:1 (worst case)

Page 14: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 14

Layer 3

Vertex Detector Assembly

Layer 4

Page 15: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 15

How to measure Vcb?ð HQET: use B→D*l ν at q2

max

ð D* at rest (in B frame)

ð with D*→Dπ and almost nophasespace the π is as restas well.

How to find a π at rest?

With good resolution(at low energies) and high granularity try:

π0’s

Detecting Neutral Particles

CLEO

CLEO

Page 16: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 16

Re-Stacking theCalorimeterEndcap

• CLEO pioneered use of CsI calorimeter• 7800 crystals.• 2% energy resolution at 1 GeV.• 4 mr angular resolution at 1 GeV.• no radiation damage observed.• reduced material in front of endcaps.

Electromagnetic Calorimeter

All B-Factories use CsI calorimeter

Page 17: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 17

CLEO gets RICH• 4σ K/π separation at 3 GeV

• LiF radiator, saw tooth + plane

• N2 expansion volume (16 cm)

• TEA/CH4 based photo detector

• ~250,000 electronic channels

Search for B → ππand B → Kπ• important for CP

• very rareB0→K+π- = 1.8 x 10-5

B → ππ = ?

CLEOB0→K+π-

Particle Identification

Page 18: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 18

Particle Identification

420 LiF radiators300 Plane120 Saw-tooth17.5 x 17 x 1 cm3

UV transparent135-165 nm

Page 19: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 19

Photon Detection

MWPC + Pad Readout~230,000 pads(8 mm x 7.5 mm)TEA/CH4Gas gain ~25,000

8 CaF windows100 µm strips, every 2.5 mm(field shaping)G10 frame (and ribs for flatness)

CaF, LiF Transmission ~ 90%

Page 20: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 20

Arrival atWilson Lab

RICH Assembly

Page 21: CESR and CLEO - OSU · 50 mm pitch 150 MW, 150 pF Silicon Sensor 27.0 x 53.2 mm 2 511 strips per side 50 mm r-f 100 mm z • Up to 5 silicon sensors daisy-chained to one readout.

Klaus Honscheid, LP 99 21


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