Author/Authors :
Brock، نويسنده , , I.C. and Engler، نويسنده , , A. and Ferguson، نويسنده , , T. and Filthaut، نويسنده , , F. and Kraemer، نويسنده , , R.W. and Merk، نويسنده , , M. and Rippich، نويسنده , , C. and Shi، نويسنده , , X. and Shukla، نويسنده , , J. and Sutton، نويسنده , , R.B. and Tsipolitis، نويسنده , , G. and Vogel، نويسنده , , H. and You، نويسنده , , J. and Lecoq، نويسنده , , P. and Bobbink، نويسنده , , G.J. and Buskens، نويسنده , , J. and Cerjak، نويسنده ,
Abstract :
One of the limiting factors in the determination of the electroweak parameters from cross section measurements of e+e− annihilation close to the Z pole is the precision of the luminosity measurement. The luminosity monitor of the L3 detector at LEP and the analysis of its data are described. Using a combination of a BGO calorimeter and a 3-layer silicon tracker, the absolute luminosity has been measured with an experimental precision of 0.08% in 1993 and 0.05% in 1994. The measurement relies on a detailed understanding of small-angle elastic e+e− (Bhabha) scattering from the experimental and theoretical point of view, as well as an excellent knowledge of the detector geometry.
