1. Investigation on Part of Work Done by Electroweak Group
Ye Li
Graduate Student
UW – Madison

2. 1. Measurement of Z Forward-backward Asymmetry
p p-bar → γ*/Z + X → e+ e- + X
Luminosity: 364/pb
The method of Matrix Inversion:
correct for the distortion in the measurement caused by the detector resolution and photon radiation in the final state. (unfold the detector effect)
Chosen for its simplicity and lack of bias

4. Vertex interaction of Z → l+ l- :
- i ( g / cos θw ) γμ (cvl – cAl γ5)
in which cvl and cAl are separately vector and axial-vector couplings
Discuss in the rest-frame of the lepton pair
Define
AFB =[ total forward c.s. (cos θ*> 0) – total backward c.s. (cos θ*< 0) ] / total c.s.

5. Response Matrix: connecting observed values and actual values

6. The distribution of electron scattering cosθ
The distribution of electron scattering cosθ* (below, around and above Z pole)

7. Unfolded AFB, Agreement with the LO SM calculation is χ2 / ndof = 10

8. Uncertainty

9. 2. First Measurement of the W Boson Mass with CDF in Run II
MW = ± 48 MeV/c2 (the world's most precise single measurement)
Candidates:
63,964 W→e ν
51,128 W→μν
Measurement Technique:
Extracted from a template fit to the transverse quantity distribution predicted by the MC simulation

10. Calibration: Uncertainty Momentum Scale Calibration
Energy Scale Calibration
Recoil Calibration (?)
Z recoil tuning
Z recoil validation
W recoil validation
Uncertainty

11. Momentum scale summary

12. * Tunning from E/P spectrum
Energy scale * Radiative material *

13. Z recoil tuning (2919 Z→ee and 4960 Z→μμ Events):
RMS of η balance vs ZpT RMS of ξ balance vs ZpT

14. Z recoil validation: Dilepton pT

15. Transverse Mass
Transverse Momentum
Transverse Missing Energy

16. Production and Decay Model:
20 CTEQ6 pairs (?)

17. Additional W Mass Fits

18. MW vs M-top Plots