|Title: ||The Influence of the experimental methodology on the QED theoretical uncertainties on the measurement of the M(W) at LEP.|
|Authors: ||Thomson, M A|
|Issue Date: ||Jul-2003|
|Publisher: ||HEP, Cavendish Laboratory, University of Cambridge|
|Series/Report no.: ||Cavendish-HEP-03-08|
|Abstract: ||Previous studies of the QED systematic uncertainties on the LEP measurement of the W-boson
mass, MW, have used idealized event selections and fitting procedures. In this paper, the Monte
Carlo tandem of KoralW and YFSWW is used to investigate how the full experimental MW
extraction procedure affects these estimates. It is found that the kinematic fitting used in
the experimental determination of MW enhances the sensitivity to QED corrections involving
real photon production. It is concluded that the previous estimates of the QED theoretical
uncertainty on the LEP2 MW measurement may be too small. A simple procedure for approx-
imating the effect of the kinematic fit at the level of the generated four fermions is proposed.
This procedure would allow previous theoretical studies to be repeated using a much closer
approximation of the real experimental mass extraction method. Finally, the possibility of
setting experimental limits on O(α) theoretical uncertainties using identified e+e− ! W+W−γ
events is discussed.|
|Appears in Collections:||Scholarly works - High Energy Physics|
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