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Ahren Sadoff CESR/CLEO Orientation Seminar Dec. 11, 12, 2006 PowerPoint Presentation
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Ahren Sadoff CESR/CLEO Orientation Seminar Dec. 11, 12, 2006 - PowerPoint PPT Presentation


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dE/dx in CLEO. Bethe Block Equation ----- Depends only on β Defining the dE/dx variables Resolution The Corrections Hit level Run level Track level Hadronic Separation. Ahren Sadoff CESR/CLEO Orientation Seminar Dec. 11, 12, 2006.

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Ahren Sadoff CESR/CLEO Orientation Seminar Dec. 11, 12, 2006


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slide1

dE/dx in CLEO

  • Bethe Block Equation ----- Depends only on β
  • Defining the dE/dx variables
  • Resolution
  • The Corrections
      • Hit level
      • Run level
      • Track level
  • Hadronic Separation

Ahren Sadoff

CESR/CLEO Orientation Seminar Dec. 11, 12, 2006

slide2

Particle ID using dE/dx

The Bethe Block Equation

dE/dx = (DZρ/A)1/β2[ ln(2meγ2β2c2/I) – β2 – δ/2]

  • Note:
  • For low values of β: dE/dx ~ 1/β2
  • For relativistic values of β: dE/dx ~ ln(γβ)2 ; “relativistic rise”

I = Average Ionization Energy

δ ~ lnγ2 for β ~ 1; “density effect” , saturates dE/dx

Ahren Sadoff

CESR/CLEO Orientation Seminar Dec. 11, 12, 2006

de dx vs and momentum
dE/dx vs βγ and Momentum

Ahren Sadoff

CESR/CLEO Orientation Seminar Dec. 11, 12, 2006

slide4

Ahren Sadoff

CESR/CLEO Orientation Seminar Dec. 11, 12, 2006

slide5

Resolution (σr)

The Landau distribution of the total energy loss across a gas volume.

Note the long Landau tail on the distribution.

σr ~ N-0.43

Ahren Sadoff

CESR/CLEO Orientation Seminar Dec. 11, 12, 2006

slide6

Wire by Wire Gain Correction

Ahren Sadoff

CESR/CLEO Orientation Seminar Dec. 11, 12, 2006

slide7

Path length and Entrance Angle Correction

Ahren Sadoff

CESR/CLEO Orientation Seminar Dec. 11, 12, 2006

slide8

Atmospheric Pressure Correction (run level)

Ahren Sadoff

CESR/CLEO Orientation Seminar Dec. 11, 12, 2006

slide9

Dip Angle Saturation (track level)

Ahren Sadoff

CESR/CLEO Orientation Seminar Dec. 11, 12, 2006

slide10

Ahren Sadoff

CESR/CLEO Orientation Seminar Dec. 11, 12, 2006

slide11

Ahren Sadoff

CESR/CLEO Orientation Seminar Dec. 11, 12, 2006

de dx vs momentum
dE/dx vs momentum

Ahren Sadoff

CESR/CLEO Orientation Seminar Dec. 11, 12, 2006

slide13

K-π Separation

at P ≈ 2 GeV/c, K/π separation is ≈ 2σ

  • CBX 05-43Pion and Kaon Identification Efficiencies for CLEO-c I. Brock, R. Briere

Ahren Sadoff

CESR/CLEO Orientation Seminar Dec. 11, 12, 2006