Strategy for high-precision luminosity measurement with the CMS detector at the HL-LHC

Abstract

The High-Luminosity Large Hadron Collider (HL-LHC) upgrade of the LHC is foreseen to reach an instantaneous luminosity at a factor of five to seven times the nominal LHC design value (1034cm−2 s−1). The resulting, unprecedented requirements for background monitoring and luminosity measurement create the need for new high-precision instrumentation at the Compact Muon Solenoid (CMS) experiment, using radiation-hard detectors. This contribution presents the strategy for bunch-by-bunch online luminosity measurement based on various detector technologies. The potential of the exploitation of the tracker endcap pixel detector, the outer tracker, the barrel muon detectors and the 40 MHz muon scouting system is discussed together with the concept of a standalone luminosity and beam-induced background monitor using Si-pad sensors.