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MCFM Studies

MCFM Studies. Neil Delwadia. Last Meeting…. Varied QCD and QCD_fac scales in order to evaluate systematic errors Learned that there was greater error in cross section calculation when scales were stretched in opposite directions. Past Week. Varied measure of energy of decay products

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MCFM Studies

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  1. MCFM Studies Neil Delwadia

  2. Last Meeting… • Varied QCD and QCD_fac scales in order to evaluate systematic errors • Learned that there was greater error in cross section calculation when scales were stretched in opposite directions.

  3. Past Week • Varied measure of energy of decay products • From (p3 + p4 + p5) • To sqrt(M^2 + pt5^2) • where M = mass of particle 3+4 My program: SigmaAvg: 6608.65 Error: +/- 19.7897 (0.299%) Al's program: FiducialZ+g inclusive CS = 1362.37 fb (change: -0.239%) FiducialZ+g exclusive CS = 1141.51 fb (change: -0.761%)

  4. My program: SigmaAvg: 6590.32 Error: +/- 18.1118 (0.275%) Al's program: FiducialZ+g inclusive cross section = 1360.00 fb(change: -0.413%) FiducialZ+g exclusive cross section = 1132.31 fb (change: -1.56%) • Set QCD and QCD_fac scales to mass of Z boson

  5. Altered structure of proton (PDF) • Changed input from CT10.00 to mstw8nl. My program: SigmaAvg: 6595.55 Error: +/- 18.4498 (0.280%) Al's program: FiducialZ+g inclusive cross section = 1376.28 fb (change: +0.779%) FiducialZ+g exclusive cross section = 1152.51 fb (change: +0.196%)

  6. epsilon_h = 0.01 • My program: • SigmaAvg: 6488.2 • Error: +/- 14.7741 (0.228%) • Al's program: • FiducialZ+g inclusive CS = 1354.69 fb • (change: -0.802%) • FiducialZ+g exclusive CS = 1138.73 fb • (change: -1.00%) • Varied isolation of photon • epsilon_h = 1.0 • My program: • SigmaAvg: 6510.99 • Error: +/- 12.9983 (0.200%) • Al's program: • FiducialZ+g inclusive CS = 1346.09 fb • (change: -1.43%) • FiducialZ+g exclusive CS = 1132.95 fb • (change: -1.50%)

  7. Alter photon fragmentation set from BFGsetII to… • BFGset_I My program: SigmaAvg: 6551.89 Error: +/- 18.4258 (0.281%) Al's program: FiducialZ+g inclusive CS = 1354.94 fb (change: -0.784%) FiducialZ+g exclusive CS = 1140.05 fb (change: -0.888%) • GdRG__LO • My program: • SigmaAvg: 6604.58 • Error: +/- 14.4603 (0.219%) • Al's program: • FiducialZ+g inclusive CS = 1361.53 fb • (change: -0.301% • FiducialZ+g exclusive CS = 1147.61 fb • (change: -0.230%)

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