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Efficient PU Cleaning for Energy Tails in HGCAL

Our PU cleaning technique effectively removes residual PU dependency on reconstructed energy in HGCAL, resulting in improved energy tails. By implementing a loose qdphi cleaning cut, we are able to remove clusters that have qdphi < -0.2 and ET < 0.5 GeV. This cleaning method proves to be beneficial for electrons with pT > 15 GeV in the region of 1.6 < |h| < 2.7, especially when cracks are removed. We also observe better energy tails in HGCAL for electrons with pT > 15 GeV, |h| < 2.7, and loose qdphi cleaning cut compared to the previous cleaning method. We expect a strong improvement in energy resolution by including cluster corrections and not combining it with tracker information. The gain from the regression on HZZ4e mass resolution is 35% in Run I.

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Efficient PU Cleaning for Energy Tails in HGCAL

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  1. Energy tails: PU cleaning • Our PU cleaning is efficient as shown on left plot S36 of Pedro’s talk • No residual PU dependency on the reconstructed energy • However when limiting to |h|<2.7 that avoids the most difficult PU region a looser cleaning can be sufficient Loose qdphi: remove cluster if qdphi<-0.2 && ET<0.5 GeV qdphi cleaning cut No qdphi cleaning cut Loose qdphi cleaning cut pT>15 GeV, 1.6<|h|<2.7, f cracks removed With loose qdphi cut no left tail and no PU (right) tail, overall better

  2. Energy tails: PU cleaning All electrons, 1.6<|h|<2.7, f cracks removed, loose qdphi cleaning cut (can be compared to right plot S36 of Pedro’s talk where full qdphi cut was applied) With loose qdphi cleaning cut there is more impact from the longitudinal segmentation for the PU cleaning Slightly more high energy tail than for pT>15 as expected from more important PU effect at low pT

  3. Electron energy resolution in HGCAL (new) HGC EE pT>15 GeV, f cracks removed, new cleaning for |eta|<2.7 HGC EE pT>30 GeV f cracks removed, new cleaning for |eta|<2.7 No cluster energy corrections applied, expect strong improvement from including cluster corrections No combination with tracker information At Run I the gain from the regression on HZZ4e mass resolution is 35% wrt cut based corrections!

  4. Electron energy resolution in HGCAL (previous) HGC EE pT>15 GeV, f cracks removed HGC EE pT>30 GeV f cracks removed

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