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EE events Thibault Guillemin (With inputs from many people) High - PowerPoint PPT Presentation

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EE events Thibault Guillemin (With inputs from many people) High mass diphoton meeting March 24, 2016 Outline EE tension Purity Kinematics 2 Thibault Guillemin Observed significances Exotics Exotics +TightIso - N.B. 1: done

  1. EE events Thibault Guillemin (With inputs from many people) High mass diphoton meeting March 24, 2016

  2. Outline  EE tension  Purity  Kinematics 2 Thibault Guillemin

  3. Observed significances Exotics Exotics +TightIso - N.B. 1: done for a scalar signal model but similar behaviour observed for a graviton signal model. - N.B. 2: distribution of the Z values between categories more relevant than the absolute values due to the procedure used. - N.B. 3: scalar selection not discussed at all (2 EE events in 700-850). - 3 σ tension for the EE category with loose isolation. - The tension observed in this category completely disappears when going to tight isolation. 3 Thibault Guillemin

  4. Purity (1/2) LooseIso - Striking distribution of the jet-jet contribution. - Despite the large uncertainties, quite clear decrease of the purity in the region 300-700 GeV. 4 Thibault Guillemin

  5. Purity (2/2) TightIso - Jet-jet contribution decreased by a factor ~10. - Purity above 80% in all the mass range. 5 Thibault Guillemin

  6. Mass shapes: comparison to MC gg LooseIso TightIso - Very strong slope in the LooseIso case - Slope reduced in the TightIso case, but still clearly there, while the purity is >80%: physics modeling issue with Sherpa? 6 Thibault Guillemin

  7. Δη in mass bins (1/2) TightIso Data - The two populations MC gg correspond to the events with photons in same/opposite endcaps. - Good description by Sherpa. 7 Thibault Guillemin

  8. Δη in mass bins (1/2) LooseIso - Much higher fraction of high- Δη events in data in the 300- 700 GeV region. - Fraction in correct agreement in the excess region. 8 Thibault Guillemin

  9. Δη modeling (inclusive case) TightIso - Bad modeling of Δη observed in the 200-600 GeV range, while the purity is >90%. - It may be interesting to: • look at the distribution of gamma-jet events from control regions • see the impact on MC of a Δη reweighting (increase of the high Δη contribution) on the mass shape. 9 Thibault Guillemin

  10. Modeling of gamma-jet events from control regions (1/2) Select loose-not-tight ID photons (loose isolation applied) to define gamma-jet dominated control regions and compare to gamma-jet MC. Cuts Loose: 7 GeV Tight: 2.45 GeV Use these control regions to look at the η -category distribution in the signal region. Control regions here. 10 Thibault Guillemin

  11. Modeling of gamma-jet events from control regions (2/2) 11 Thibault Guillemin

  12. Studies of grey photons - Look at the shower shapes of the grey photons (passing loose isolation but failing tight isolation) in EE events.  Repeat the study already done in the crosschecks note, but restricting to EE events.  Is the jet rejection in the EC at high p T under control? - To do: • Start inclusively (in p T ) and look in p T bins (as statistics allows). • Correlations with the conversion status? 12 Thibault Guillemin

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