The influence of the experimental methodology on the QED theoretical uncertainties on the measurement ofMWat LEP | Zendy

M. Thomson | Zendy

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The influence of the experimental methodology on the QED theoretical uncertainties on the measurement ofM_Wat LEP

Author(s) -

M. Thomson

Publication year - 2003

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2003/08/009

Subject(s) - physics , monte carlo method , photon , sensitivity (control systems) , experimental data , kinematics , event (particle physics) , tandem , simple (philosophy) , fermion , nuclear physics , measurement uncertainty , statistical physics , computational physics , particle physics , statistics , quantum mechanics , mathematics , philosophy , materials science , epistemology , electronic engineering , engineering , composite material

Previous studies of the QED systematic uncertainties on the LEP measurementof the W-boson mass have used idealized event selections and fittingprocedures. In this paper, the Monte Carlo tandem of KoralW and YFSWW is usedto investigate how the full experimental mass extraction procedure affectsthese estimates. It is found that the kinematic fitting used in theexperimental determination of the W-boson mass enhances the sensitivity to QEDcorrections involving real photon production. It is concluded that the previousestimates of the QED theoretical uncertainty on the LEP2 W-mass measurement maybe too small. A simple procedure for approximating the effect of the kinematicfit at the level of the generated four fermions is proposed. This procedurewould allow previous theoretical studies to be repeated using a much closerapproximation of the real experimental mass extraction method. Finally, thepossibility of setting experimental limits on O(alpha) theoreticaluncertainties using identified e+e- -> W+W-gamma events is discussed.Comment: 9 pages, 2 postscript figure

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