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Hadronic W reconstruction

Explore calo tower jet mass calculations for Hadronic W composite particle reconstruction in particle physics analysis. Compare traditional calibrated jet masses to lazy method results for improved accuracy. Investigate discrepancies in jet linearity for low versus high Et jets in the ttH analysis code. Understand implications of calibrating reco jets to the detector and physics in W mass calculations.

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Hadronic W reconstruction

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  1. Hadronic W reconstruction Lily Jan 08

  2. Preamble: Hadronic W is a composite particle made up from 2 (ish) Jets. ‘Proper’ way to calculate mass of W (and the way we do it in our ttH analysis code) is this way: Where jet masses determined from calo towers using: But I tried re-doing it the lazy way (for various not-so-lazy reasons): And to my surprise I found more desirable results. Why is this? Is it a trick?

  3. Tower jets : Calibrated to particle level (calo cells weighted, then f(Et,eta)=Etrec/EtMC applied (QCD dijets)). Jets have had soft muons after being reconstructed, calibrated. Reco W has higher mass than gen W, particularly for higher jet Et and Looks better using massless jet approximation….

  4. Now notice drop in linearity for lower Et jets. Why? Reco/gen Reco/truth…

  5. Low Et: Reco Jets~0.93, Truth jets ~0.88 R/T~1.06 Higher Et: Reco Jets~1.03, Truth Jets~1.06 *But* Reco jets have been calibrated to detector and physics.

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