Smooth running at CERN’s LEP electronpositron collider, now at 189 GeV collision energy (94.5 GeV per beam), is reflected in a fast climbing, integrated luminosity curve. Integrated luminosity is a measure of the number of electronpositron collisions provided for physics, and the 1998 score is already well past that of previous years. LEP runs until early November. Recent performance has yielded luminosities of more than 9×1031 per cm2 per s and an integrated luminosity of 3 inverse picobarns in a 24-hour period.
