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PHYS 5326 – Lecture #8

PHYS 5326 – Lecture #8. Monday, Feb. 17, 2003 Dr. Jae Yu. Interpretation of Sin 2 q W results The link to Higgs. Move Wednesday’s class and the makeup class to Friday 9am-12pm in rm 200, this week only!!. Last Week’s Homework Assignments.

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PHYS 5326 – Lecture #8

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  1. PHYS 5326 – Lecture #8 Monday, Feb. 17, 2003 Dr. JaeYu • Interpretation of Sin2qW results • The link to Higgs Move Wednesday’s class and the makeup class to Friday 9am-12pm in rm 200, this week only!! PHYS 5326, Spring 2003 Jae Yu

  2. Last Week’s Homework Assignments • Process the transferred TMB data files and convert them into TMBtree for root analysis • You can work together on this one • One person can produce TMBtree for all • Due next Monday, Feb. 17 • Produce an electron ET spectrum of the highest ET electrons in your samples • Due next Wednesday, Feb. 19 PHYS 5326, Spring 2003 Jae Yu

  3. MC to Relate Rnexp to Rn and sin2qW • Parton Distribution Model • Correct for details of PDF model  Used CCFR data for PDF • Model cross over from short nm CC events PHYS 5326, Spring 2003 Jae Yu

  4. MC to Relate Rnexp to Rn and sin2qW • Neutrino Fluxes • nm,ne,`nm,`ne in the two running modes • ne CC events always look short • Shower length modeling • Correct for short events that look long • Detector response vs energy, position, and time • Continuous testbeam running minimizes systematics PHYS 5326, Spring 2003 Jae Yu

  5. sin2qW Fit to Rnexp and R`nexp • Thanks to the separate beam Measure Rn’s separately • Use MC to simultaneously fit and to sin2qW and mc, and sin2qW and r • Rn Sensitive to sin2qW while R`nisn’t • Rnis used to extract sin2qW and R`nto control systematics • Why??? PHYS 5326, Spring 2003 Jae Yu

  6. Syst. Error dominated since we cannot take advantage of sea quark cancellation sin2qW Fit to Rnexp and R`nexp • Single parameter fit, using SM values for EW parameters (r0=1) • Two parameter fit for sin2qW and r0yields PHYS 5326, Spring 2003 Jae Yu

  7. Dominant uncertainty Source of Uncertainty d sin2qW Statistical 0.00135 ne flux 0.00039 Event Length 0.00046 Energy Measurements 0.00018 Total Experimental Systematics 0.00063 CC Charm production, sea quarks 0.00047 Higher Twist 0.00014 Non-isoscalar target 0.00005 0.00022 RadiativeCorrection 0.00011 RL 0.00032 Mhiggs Term Mt Term Total Physics Model Systmatics 0.00064 Total Systematic Uncertainty 0.00162 DMW (GeV/c2) 0.08 NuTeV sin2qWUncertainties 1-Loop Electroweak Radiative Corrections based on Bardin, DokuchaevaJINR-E2-86-2 60 (1986) PHYS 5326, Spring 2003 Jae Yu

  8. NuTeV vs CCFR Uncertainty Comparisons }Beamline worked! }Technique worked! PHYS 5326, Spring 2003 Jae Yu

  9. 2.5 s deviation! Comparison of New sin2qW Comparable precision but value smaller than other measurements PHYS 5326, Spring 2003 Jae Yu

  10. SM Global Fits with New Results Without NuTeV c2/dof=20.5/14: P=11.4% With NuTeV c2/dof=29.7/15: P=1.3% Confidence level in upper Mhiggs limit weakens slightly. LEP EWWG: http://www.cern.ch/LEPEWWG PHYS 5326, Spring 2003 Jae Yu

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