Speaker
Description
For LHC Run 4, CMS has planned substantial upgrades to enhance its forward-physics capabilities in proton–proton and heavy-ion collisions. To exploit the full potential of the HL-LHC datasets, a radiation-hard Zero-Degree Calorimeter and an upgraded Precision Proton Spectrometer, with new optics and improved high-pileup performance, have been designed. Following successful tests during Run 3 heavy-ion data taking, prospects for instrumenting the very-forward region with new forward scintillator counters covering $6<\eta<8$ are also being explored. In addition, the timing detector, by providing hadron PID down to low $p_T$ across a wide pseudorapidity range, will further enhance CMS’s capability to study photon-induced light and heavy-flavor probes with the highest experimental accuracy. This talk reviews the physics reach enabled by the upgrade program — from precision photonuclear and diffractive measurements in proton–proton, proton–ion, and ion–ion collisions to enhanced sensitivity for targeted BSM searches — and summarizes the detector specifications and implementation plans. We will also describe how these upgrades, together with enhanced L1 tracking triggers, extend the triggering and selection capabilities for UPC heavy-ion collisions.
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