1 / 12

Current Status of Higgs Branching Ratio Studies for ILC: Detector Benchmarking and Results

This document presents an overview of the current status of Higgs branching ratio (BR) studies at the International Linear Collider (ILC), focusing on key channels such as H→bb, cc, and gg at center-of-mass energies of 250 and 350 GeV. The analysis is based on the latest simulation and reconstruction efforts, as detailed in the Detailed Baseline Document. With Higgs mass set at 125 GeV, we review detector performance benchmarks, including jet energy resolution and flavor tagging. This report is integral for optimizing Higgs physics studies leading up to the Linear Collider Workshop 2012.

leane
Télécharger la présentation

Current Status of Higgs Branching Ratio Studies for ILC: Detector Benchmarking and Results

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. Higgs branching ratios study Oct. 13 2012 Hiroaki Ono (NDU) ILC Physics WG general meeting

  2. Current status of Higgs BR study • Higgs branching ratios analysis publication • Ecm=250 and 350 GeVHbb, cc, gg channel • Submitted to EPJ, now under review… • Detailed Baseline Document (DBD) study • Detector benchmarking study for ILD • e+e-ννh @ 1 TeV branching ratio study • Physics chapter • Update results with Higgs mass of 125 GeV ILC Physics WG general meeting

  3. vvh detector benchmarking study e+e-vvhis one of the DBD detector benchmarking process Observable: cross section times branching ratios (σ×BRs) Decay channels: hbb, cc, gg, WW*, μμ Evaluate ILD detector performance at Ecm=1 TeV • Jet energy resolution (Reconstructed Higgs mass) • Jet clustering and reconstruction (with γγ BG overlay) • Flavor tagging performance (b/c tagging) • Tracking performance, momentum resolution (Hμμ) We perform the full detector simulation with latest reconstruction packages in ILD ILC Physics WG general meeting

  4. Higgs physics at ILC 1 TeV Higgs mainly produced via e+e-νeνeh (WW-fusion) • Final state only comes from Higgs decay • Hbb, cc, gg (two jets) • HWW* (four jets via fully hadronic decay) • Hμμ (dilepton) γγhadron BG is also overlaid as same as CLIC study ILC Physics WG general meeting

  5. Simulation condition Higgs BRs @Mh=125 GeV Higgs signal sample Higgs mass: Mh=125 GeV CM energy: Ecm=1 TeV Beam polarization: P(+-0.8, -+0.2) L=500 fb-1 for both pol. Softwares Detector model: ILD_o1_v05 Simulation: Mokka v01-14-01-p00 Reconstruction: Marlin v01-16-00 • Detector mass simulation was finished • Mass reconstruction is still on-going ILC Physics WG general meeting

  6. Hbb, cc, ggchannel • Hbb, cc, gghadronic • Simply final state forms two jets • γγhadron background is also overlaid on signal • Apply forced two jet clustering at firstTry different jet clustering algorithm • Durham (LOI) • kt algorithm (used in CLIC CDR for hadron collider) • R parameter(jet-radius) should be tuned Only check signal samples at this moment… ILC Physics WG general meeting

  7. Invariant mass distribution Without γγhadron overlay • w/o BG overlay • w/ BG overlay Invariant mass (GeV) Invariant mass (GeV) • Cut on the angler distribution • Different jet clustering DurhamkT jet algorithm (as same as CLIC CDR) ILC Physics WG general meeting

  8. kT jet clustering Dijet reconstruction with γγhadron BG Use Durham w/o BG overlay Optimize R parameter for kT algorithm R=1.0~1.3 looks suitable Check with forward particle before jet reconstruction Invariant mass (GeV) ILC Physics WG general meeting

  9. Jet reconstruction with PFO cut Dijet reconstruction with γγhadron BG Set R=1.1 for kT algorithm • w/o BG • w/ BG kT • w/ BG kT (cosθ<0.98) • W/ BG inv. M (cosθ<0.98) Check with small statistics Slightly improve the PFO cosθ cut ILC Physics WG general meeting

  10. HWW* channel HWW* (one on-shell W) from Higgs decay HWW*qqqqfully hadronic decay channel is considered Apply forced four jet clusteringEmploy kT algorithm with R=1.0 Jet paring for W1, W2(W1 is on-shell with J1, J2)Select best candidate with minimizing χ2 W2 h W1 ILC Physics WG general meeting

  11. Reconstructed masses Mw1 Mw MH ILC Physics WG general meeting

  12. Conclusion • We concentrate the studies for DBD • vvH@ 1TeV • Detector simulation has beenfinalized • Reconstruction is now still on-going • Schedule is quite tight but need to finalize by LCWS12 ILC Physics WG general meeting

More Related