1. 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

2. Particle ID using dE/dx The Bethe Block Equation dE/dx = (DZρ/A)1/β 2 [ ln(2m e γ 2 β 2 c 2 /I) – β 2 – δ/2] Note: For low values of β: dE/dx ~ 1/β 2 For relativistic values of β: dE/dx ~ ln(γβ) 2 ; “relativistic rise” I = Average Ionization Energy δ ~ ln γ 2 for β ~ 1; “density effect”, saturates dE/dx Ahren Sadoff CESR/CLEO Orientation Seminar Dec. 11, 12, 2006

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

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

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