Ahren Sadoff

1
dE/dx in CLEO

• Bethe Block Equation ----- Depends only on ß
• 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
2
Particle ID using dE/dx
The Bethe Block Equation
dE/dx (DZ?/A)1/ß2
ln(2me?2ß2c2/I) ß2 d/2

• Note
• For low values of ß dE/dx 1/ß2
• For relativistic values of ß dE/dx ln(?ß)2
  relativistic rise

I Average Ionization Energy d ln?2 for ß 1
density effect , saturates dE/dx

Ahren Sadoff
CESR/CLEO Orientation Seminar Dec. 11, 12,
2006
3
dE/dx vs ß? and Momentum

Ahren Sadoff
CESR/CLEO Orientation Seminar Dec. 11, 12,
2006
4

Ahren Sadoff
CESR/CLEO Orientation Seminar Dec. 11, 12,
2006
5
Resolution (sr)
  
The Landau distribution of the total energy loss
across a gas volume. Note the long Landau tail
on the distribution.
sr N-0.43

Ahren Sadoff
CESR/CLEO Orientation Seminar Dec. 11, 12,
2006
6
Wire by Wire Gain Correction

Ahren Sadoff
CESR/CLEO Orientation Seminar Dec. 11, 12,
2006
7
Path length and Entrance Angle Correction

Ahren Sadoff
CESR/CLEO Orientation Seminar Dec. 11, 12,
2006
8
Atmospheric Pressure Correction (run level)

Ahren Sadoff
CESR/CLEO Orientation Seminar Dec. 11, 12,
2006
9
Dip Angle Saturation (track level)

Ahren Sadoff
CESR/CLEO Orientation Seminar Dec. 11, 12,
2006
10

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

Ahren Sadoff
CESR/CLEO Orientation Seminar Dec. 11, 12,
2006
12
dE/dx vs momentum

Ahren Sadoff
CESR/CLEO Orientation Seminar Dec. 11, 12,
2006
13
K-p Separation
at P 2 GeV/c, K/p separation is 2s
CBX 05-43 Pion and Kaon Identification
Efficiencies for CLEO-c I. Brock, R. Briere

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