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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. 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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  1. 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

  2. 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

  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. 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

  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 05-43Pion and Kaon Identification Efficiencies for CLEO-c I. Brock, R. Briere Ahren Sadoff CESR/CLEO Orientation Seminar Dec. 11, 12, 2006

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