Measurement of the forward-backward Asymmetry with e+e- pairs: Winter 2004


Authors: Gregory Veramendi, Gilles De Lentecker, Adam Gibson, and Young-kee Kim
e-mail authors


Here is my talk (powerpoint, pdf)  from PHENO, which includes all the plots and tables from the analysis.
This may be useful for copying and pasting numbers and tables into powerpoint. It may be useful for
better understanding the analysis.

All the plots can be found in this tarball. You will find eps, gif, and root files for each plot for your convenience. Below
are brief explanations of the plots contained in the tarball.


Results


These are the results assuming SM couplings (We usually show this one):
Afb_Results_SM_040422.eps
Afb_Results_SM_zoom_040422.eps

This is the contour plot of the u/d-Z quark couplings
contourquarks_with_syst_3sig.eps


These are the results without any SM constraints (larger uncertainties near the Z-peak):
Afb_Fit_smooth_040422.eps
Afb_Fit_smooth_zoom_040422.eps

This is a backup plot to show the different calculations that contribute to the theory band.
Theory_band_source_040425.eps

This shows the invariant mass distribution of the candidate events.
Mass_data_040425.eps

These two plots show the invariant mass and cos(theta) comparing data with MC and background expectations.
Mass_tot_040425.eps

CosTheta_040425.eps


Checks of the simulation:



This show a comparison of the Z-peak showing agreement of Energy scale and resolution
Mass_Scale_Res_040425.eps
This shows how the sign mis-identification depends on Invariant Mass. Mis-ID rate is half of SS event rate
MisId_SS_Mee.eps
This shows a comparison of eta between Simulation and Data, we check the difference as a systematic, and it is negligible
eta_040425.eps


Acceptance

This shows the acceptance  versus cos(Theta) for kinematic and geometric cuts only.
Acceptance_costheta_040425.eps
This shows the acceptance/correction factor vs invariant mass for 4 different effects with no simulation
    starting top left and going counter-clockwise: geometric, kinematic, resolution, internal radiation
gen_kinematic_sum.eps
This shows the total acceptance/correction factor including all effects in the simulation
Acceptance_Mee_040425.eps
This shows how events migrate from one bin to another. The rows are normalized to one. To see where events originate before detector effects, choose one row and read off the percentages. For example bin 15 is mostly coming from bin 15 at the
physics level. Bin 5 has a larger percentage of events coming from bin 7 (the Z-pole) than from the original bin 5.
Event_Migration_Matrix.eps



Background


Invariant mass distribution of the dijet background
Mass_Dijet_040425.eps

Cross-check of dijet background calculation in CC topology:
Mass_SSvOS_040425.eps

Asymmetry of Dijet background (plot shows that it is nearly zero):
Afb_QCD.eps



Last updated Fri, 09 Jun 2004 by  Gregory Veramendi