Precision luminosity measurement at LHC using two-photon production of μ+μ− pairs

The application of the two-photon process pp→pp+μ+μ− for the luminosity measurements at LHC with the ATLAS detector is considered. The expected accuracy of the absolute offline luminosity determination is 1–2% for the luminosity range of 1033–1034 cm−2 s−1. The preliminary cross-section estimates done for LHCb promise the same level of the luminosity measurement accuracy at L=2×1032 cm−2 s−1.