1 / 12

Status of the HZ Analyses

Status of the HZ Analyses. LCD WG Meeting, 03/07/2012 J.S. Marshall, University of Cambridge. 350GeV HZ Recoil, L=500fb -1. Model independent recoil analysis: Z decays to charged leptons. Identify leptons and compute recoil mass, using knowledge of initial state. X. X. eeX.

nishi
Download Presentation

Status of the HZ Analyses

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Status of the HZ Analyses LCD WG Meeting, 03/07/2012 J.S. Marshall, University of Cambridge

  2. 350GeV HZ Recoil, L=500fb-1 • Model independent recoil analysis:Z decays to charged leptons. • Identify leptons and compute recoil mass, using knowledge of initial state. X X eeX eeX Brem.

  3. Comparison with ILC Results Starting point:No selection cuts Reco quantities,full selection • Integrated luminosity: 175 fb-1 • Comparison of results for X channel: Selection must work harder than at ILC, but achieves similar S/B

  4. E’ Correction Weights • Try to understand shape differences using ILC/CLIC E’ distributions from Frank. • Use distributions to obtain E’ weight: CLICILC. Starting point:No selection cuts

  5. Final State Radiation Starting point:No selection cuts

  6. Momentum Resolution • Attribute difference between use of true muons, post FSR, and use of reconstructed muons to: • Muon identification efficiency • Momentum resolution... Know this is high: 98%+

  7. 500GeV HZ Recoil, L=500fb-1 • Repeat recoil analysis at 500GeV with same code and procedures. • Corrected initial state 4-vector since last time presented 500GeV analysis. X X eeX eeX Brem.

  8. 500GeV HZqq, L=500fb-1 • Model dependent analysis, with direct Higgs mass reconstruction: look for hadronic decay of H and Z. • Force event into four jets (investigate different R values), perform kinematic fit and use B-tagging info in BDT selection. R = 1.0

  9. 500GeV HZqq, L=500fb-1 • Fluctuate high statistics signal sample, and smooth background fit, to produce 1000 test samples. R = 1.0 R = 0.7 R = 1.0 R = 1.3

  10. 500GeV H, L=500fb-1 • Model dependent analysis, with hadronic decay of H and Z decaying to neutrinos. • Previously, considered signal sample to be pure Higgsstrahlung, but cannot easily distinguish from WW-fusion process. • Must consider new inclusive sample: hnunu Implications for selection... R = 1.3

  11. 500GeV H, L=500fb-1 • Fluctuate high statistics signal sample, and smooth background fit, to produce 1000 test samples. • Switch to inclusive hnunu sample introduces several awkward features. R = 1.0 R = 0.7 R = 1.0 R = 1.3

  12. 500GeV H, L=500fb-1 Consider only exclusive sample throughout analysis: Train using exclusive sample, input “data” from inclusive sample: Full treatment of inclusive sample throughout analysis: R = 1.0 R = 1.0 R = 1.0

More Related