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 10 33 ÷10 34 cm −2 s −1 . The preliminary cross section estimates done for LHCb promise the same level of the luminosity measurement accuracy at L = 2 · 10 32 cm −2 s −1 .