The Measurement of M(W) from the W+W- Threshold Cross Section at LEP2

Details The Measurement of M(W) from the W+W- Threshold Cross Section at LEP2 The Measurement of M(W) from the W+W- Threshold Cross Section at LEP2

1995-03-14

arxiv.org/abs/hep-ph/9503320v1

Nucl.Phys. B456 (1995) 3-24

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, LATEX, 10 figures available as .uu file

Scientific paper

10.1016/0550-3213(95)00509-8

The rapid increase of the e+e- --> W+W- cross section in the threshold region provides a method for measuring M(W) at LEP2. The dependence of the theoretical cross section -- including the effects of the finite W width, Coulomb interactions and initial state radiation -- on the collider energy and on the mass and width of the W is investigated in order to deduce the optimal collider energy which maximizes the sensitivity to M(W). Statistical and systematic uncertainties are studied in detail. The background contribution from QCD four-jet production is estimated. It is shown that by running LEP2 at a collision energy of approximately 161 GeV and obtaining a luminosity of order 100 inverse picobarns per experiment, an uncertainty on the measured value of M(W) of +-70 MeV should be achievable.

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