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Advancements in μ-B Tagging for b-Jet Cross Section Measurement at 2.0 TeV

This document outlines the approach, current results, and future plans for μ-B tagging to discern b-jets at a center-of-mass energy of 2.0 TeV. It details the properties used to discriminate signal from background, including muon kinematics and jet relationships. Current data samples from ttbar events are analyzed, addressing biases in signal and background while highlighting challenges in muon reconstruction. The plan includes debugging reconstruction code and analyzing real data to refine discriminators and improve cross-section calculations.

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Advancements in μ-B Tagging for b-Jet Cross Section Measurement at 2.0 TeV

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  1. -B tagging in D0 Ultimate goal: b-jet cross section at s = 2.0 TeV • Approach • Current results • Future plans -B tagging status

  2. Approach • Use properties of  and jet (only) • Discriminate between background and signal • Current discriminators: • Pmuon • PTRel between  and jet • PLRel between  and jet • Use Run I experience! PTRel  jet -B tagging status

  3. Background • /Ks decaying to  in calorimeter • Punch through • W  (ttbar) -B tagging status

  4. Data samples • ttbar, 5000 events • Biases in signal and background? • Waiting for QCD sample • Problem: only 11% of b quarks decay to  • Need big sample -B tagging status

  5. Results - PTRel MC blue: b purple: c bc green: background  = MC  jet = MC -parent -B tagging status

  6. Results - PTRel Reco jet, MC  -B tagging status

  7. Results - PTRel Reco jet, Reco  -B tagging status

  8. Results - P MC -B tagging status

  9. Results - P Reco -B tagging status

  10. Conclusion • Jet direction not always a good measurement for heavy quark direction • Muon gets poorly reconstructed in some cases • Need to debug reconstruction code • Currently hard to get discriminants with reconstructed values -B tagging status

  11. Outlook • Improve reconstruction • Investigate performance of discriminators • From March 1st: debug real data • From ~July 2001: • Analyze real data • Calculate cross section -B tagging status

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