Ahren Sadoff CESR/CLEO Orientation Seminar Dec. 11, 12, 2006 dE/dx in CLEO Bethe Block Equation...

Ahren Sadoff

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

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

Particle ID using dE/dx

The Bethe Block Equation

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

• 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

dE/dx vs βγ and Momentum

Ahren Sadoff

The Landau distribution of the total energy loss across a gas volume. Note the long Landau tail on the distribution.

Resolution (σr)

σr ~ N-0.43

Ahren Sadoff

Wire by Wire Gain Correction

Ahren Sadoff

Path length and Entrance Angle Correction

Ahren Sadoff

Atmospheric Pressure Correction (run level)

Ahren Sadoff

Dip Angle Saturation (track level)

Ahren Sadoff

dE/dx vs momentum

Ahren Sadoff

K-π Separation

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

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

Ahren Sadoff

Ahren Sadoff CESR/CLEO Orientation Seminar Dec. 11, 12, 2006 dE/dx in CLEO Bethe Block Equation...

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