Title: Luminosity measurements of the LHC experiments
Abstract: The determination of the luminosity is a key element in the measurement of cross sections at the LHC. The uncertainty in this determination has a major impact on the accuracy of measured physics quantities. The definition of luminosity and the main strategy of its estimation by ALICE, ATLAS, CMS and LHCb experiments are presented. The van der Meer technique and associated corrections are discussed. Finally, a summary of the current results is presented.