Speaker
Arnd Meyer
(Rheinisch-Westfaelische Tech. Hoch. (DE))
Description
The luminosity is a key parameter as its uncertainty translates directly to the uncertainty of the measurement of cross sections and background rate predictions, essential to establish the Higgs and search for new particles. During the first three years of data taking at the LHC, CMS used the Hadron Forward calorimeters and the pixel tracking detector for the luminosity measurement. In dedicated Van der Meer scans the visible cross section of these devices were used to measure the luminosity at any beam intensity. Considerable progress is made in understanding and controlling systematic effects originating both from the detector and the accelerator. The precision achieved in proton-proton scattering at 8 TeV is unprecedented at a hadron collider. In this talk, the Van der Meer methodology for the determination of the visible cross section and the estimate of the systematic uncertainties will be discussed. Furthermore, the stability of the luminosity measurements is estimated using the rate of the standard candle process of vector boson production. The determination of the luminosity for the physics program of Run II will be discussed.
Author
Arnd Meyer
(Rheinisch-Westfaelische Tech. Hoch. (DE))
