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Z + Jet Calibration Studies

Z + Jet Calibration Studies. Michele Petteni Imperial College. Outline. The missing P T projection fraction method and its use in calculating the jet response. Outline of cuts and selection. Results: Hadronic response. EM calibration.  + jets. MPF (1).

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Z + Jet Calibration Studies

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  1. Z + Jet Calibration Studies Michele Petteni Imperial College MichelePetteniDØHiT Meeting

  2. Outline • The missing PT projectionfraction method and its use in calculating the jet response. • Outline of cuts and selection. • Results: • Hadronic response. • EM calibration. •  + jets. MichelePetteniDØHiT Meeting

  3. MPF (1) • Method used in Run I to calibrate jets using  + jets sample. • Based on momentum conservation in the transverse plane. • Z and jet produced back to back in r- plane. MichelePetteniDØHiT Meeting

  4. MPF (2) • For perfect response: PT(Z) + PT(recoil) = 0 • Real life: PTmeas(Z) + PTmeas(recoil) = - MPTmeas • Define: PTmeas(recoil) = Rhad· PT(recoil) • Re-arrange and assume EM corrected: MichelePetteniDØHiT Meeting

  5. Sample • Using 50 K Zee events from rootuples in SAM • Generated using pythia with <mb> =2.5, reconstructed with psim 01.02.00 and p05.00.04 • Includes Drell-Yan and , /Z interference. MichelePetteniDØHiT Meeting

  6. Cuts and Selection • Cuts: • Select 2 highest E reco em objects • ||leptons < 2.5, • Construct Z from 2 em objects • PT(Z) > 10 GeV • 61.0 < M(Z) < 121.0 • 2.942 < j - Z < 3.342. • Select events with only 1 jet in  window. MichelePetteniDØHiT Meeting

  7. R Fit • R defined as before. • Define E' = PT(Z) · cosh(j) • Fit response plots using functional form: a + b ln E + c (ln E)2 MichelePetteniDØHiT Meeting

  8. E vs. E’ MichelePetteniDØHiT Meeting

  9. R vs. E’ MichelePetteniDØHiT Meeting

  10. R vs. E’ (2) MichelePetteniDØHiT Meeting

  11. Fit for Central  Region MichelePetteniDØHiT Meeting

  12. R from  + jets MichelePetteniDØHiT Meeting

  13. EM Calibration (1) MichelePetteniDØHiT Meeting

  14. EM Calibration (2) MichelePetteniDØHiT Meeting

  15. Photon Response MichelePetteniDØHiT Meeting

  16. R from  + jets (2) MichelePetteniDØHiT Meeting

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