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Dijet Analyses for ICD Resolution and Response

Dijet Analyses for ICD Resolution and Response. Barry Spurlock The University of Texas at Arlington April 8, 2004. OUTLINE. Motivation DPCC and How We Used It Data Analyses & Results Conclusions. Motivation. Dijet study of QCD background (P13) ICD-MG Task Force (ICD weighting factor)

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Dijet Analyses for ICD Resolution and Response

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  1. Dijet Analyses for ICD Resolution and Response Barry Spurlock The University of Texas at Arlington April 8, 2004

  2. OUTLINE • Motivation • DPCC and How We Used It • Data • Analyses & Results • Conclusions Barry Spurlock

  3. Motivation • Dijet study of QCD background (P13) • ICD-MG Task Force (ICD weighting factor) • Initial analyses performed • 150k JT95TT events • More data • fixed & corrected • Needed more processing power • DPCC Barry Spurlock

  4. DPCCDistributed & Parallel Computing Cluster • Joint effort including UTA CSE dept., UTA HEP dept., and UT Southwest Medical Center (Dallas) • 97 machines/193 processors • Pentium 4 Xeons at 2.4-2.6 GHz • Over 72 terabytes disk space • The DPCC is supported, in part, by the NSF grant EIA-0216500 Barry Spurlock

  5. General Proceedure • “Submit_to_PBS” • Assign job names • Submits “run_in_batch” • “run_in_batch” • Copy data files, root macro, & tarfile • File list & root macro are chosen using the job name • Tarfile includes C++ program, header, MakeClasses • Runs the root macro as a ROOT batch job • Root macro makes classes, chains the data files, assigns values to global variables, & runs code • Compilation problems Barry Spurlock

  6. Data & Data Processing • Started with thumbnails from QCD group skim of P13 jet data • 200GB, 1281 files, 9.7M events • tmbfixer & d0correct • Used d0tools to run • Took time to find right version of tmbfixer • d0correct compiled locally • Skimmed out JT45TT, JT65TT & JT95TT • Skimmed out events with exactly two ‘good’ JCCB jets, back-to-back (±10°) • 0.5<emf<.95, chf<0.4, hot<10.0, n90>1.0 • Events: 170k JT45TT, 160k JT65TT, 37k JT95TT Barry Spurlock

  7. Analyses • ICD resolution versus ICD weighting factor • Dijet asymmetry and response by eta for various ICD weighting factors • Least squares best fit Barry Spurlock

  8. ICD Resolution • CC-ICD and CC-MG events used • Cut on narrow ET band of CC jet • Sigma/E½ used as the resolution of probe • Resolution plotted against ICD factor for 6 ET bins (60, 75, 85, 100, 120, 150) Barry Spurlock

  9. Dijet Asymmetry & Response • CC “control” jet in narrow ET range • Other jet used as probe • Plotted asymmetry and response by eta bin • Plots made for 6 ET bands (60, 75, 85, 100, 120, 150) and various values of ICD weighting factor • 1.0, 1.5, 2.0, 2.4, 2.8, 3.0, 3.2, 3.4, 3.6, 3.8, 4.0, 4.2, 4.4, & 5.0 Barry Spurlock

  10. JT65TT/100 GeV/Factor 1.0 Barry Spurlock

  11. JT65TT/100 GeV/Factor 1.5 Barry Spurlock

  12. JT65TT/100 GeV/Factor 2.0 Barry Spurlock

  13. JT65TT/100 GeV/Factor 2.4 Barry Spurlock

  14. JT65TT/100 GeV/Factor 2.8 Barry Spurlock

  15. JT65TT/100 GeV/Factor 3.0 Barry Spurlock

  16. JT65TT/100 GeV/Factor 3.2 Barry Spurlock

  17. JT65TT/100 GeV/Factor 3.4 Barry Spurlock

  18. JT65TT/100 GeV/Factor 3.6 Barry Spurlock

  19. JT65TT/100 GeV/Factor 3.8 Barry Spurlock

  20. JT65TT/100 GeV/Factor 4.0 Barry Spurlock

  21. JT65TT/100 GeV/Factor 4.2 Barry Spurlock

  22. JT65TT/100 GeV/Factor 4.4 Barry Spurlock

  23. JT65TT/100 GeV/Factor 5.0 Barry Spurlock

  24. Best Fit (Least Squares) • ET from probe jet is broken into parts ETicd = icdf *ET ETccmg = ccmg*ET ETch = chf*ET ETecmg = ecmg*ET ETrem = ET – ETicd - ETccmg - ETecmg – Etch • A linear combination of these is set equal to the ET of the control jet. • A least squares fit is used to calculate the values of the factors for each part • This was performed over a variety of eta ranges and ET bands. • This was also performed where some of the coefficients were fixed to 1 Barry Spurlock

  25. Example of Least Squares Fit Barry Spurlock

  26. Results/Conclusions • Submitting 133 jobs at 3 hours each and having it done the next day is very nice! • …But getting all the results in such a short time is a bit overwhelming. • The results will be discussed at the ICD-MG task force meeting tomorrow • At a quick glance, 3.8 seems about right. Barry Spurlock

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