Abstract
The Pixel Luminosity Telescope (PLT) is a new complement to the CMS detector for the LHC Run II data taking period. It consists of eight 3-layer telescopes based on silicon pixel detectors that are placed around the beam pipe on each end of CMS viewing the interaction point at small angle. A fast 3-fold coincidence of the pixel planes in each telescope will provide a bunch-by-bunch measurement of the luminosity. Particle tracking allows collision products to be distinguished from beam background, provides a self-alignment of the detectors, and a continuous in-time monitoring of the efficiency of each telescope plane. The PLT is an independent luminometer, essential to enhance the robustness on the measurement of the delivered luminosity and to reduce its systematic uncertainties. This will allow to determine production cross-sections, and hence couplings, with high precision and to set more stringent limits on new particle production.
Highlights
Before the end of Long Shutdown 1 (LS1), the first major maintenance and upgrade period for the LHC and its experiments, the Pixel Luminosity Telescope (PLT) was installed in the CMS experiment
It consists of eight 3-layer telescopes based on silicon pixel detectors that are placed around the beam pipe on each end of CMS viewing the interaction point at small angle
Positioned close to the beam pipe, directly behind the Forward Pixel detector its purpose is to measure the instantaneous luminosity at the highest energies and highest collision rates foreseen at the LHC
Summary
Before the end of Long Shutdown 1 (LS1), the first major maintenance and upgrade period for the LHC and its experiments, the Pixel Luminosity Telescope (PLT) was installed in the CMS experiment. Positioned close to the beam pipe, directly behind the Forward Pixel detector its purpose is to measure the instantaneous luminosity at the highest energies and highest collision rates foreseen at the LHC. The PLT is the only sub-detector in CMS, whose sole function it is to measure the delivered instantaneous luminosity. It must do this with a high precision and in real-time. The high precision is essential since the luminosity is a key quantity for many physics measurements at the LHC where data collected under different beam conditions has to be combined. The luminosity measurement needs to be directly available to the LHC operators in order to optimise the beam conditions for the experiment
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Published Version
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