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Hadronic W reconstruction

Hadronic W reconstruction. Lily Jan 08. 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:.

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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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