Abstract
The LHCb experiment is a specialized experiment for B and D physics at the CERN LHC. The layout of the experiment and the various components are described, with an overview of their performance. Global running conditions and performance are also shown. The motivation for the foreseen detector upgrade is presented, together with the proposed new detectors, to be installed during Long Shutdown 2, in 2018. 1 General overview The LHCb detector is intended to study beauty and charm physics. At LHC, the production is mainly in the forward and backward directions. Both b particles are going in the same direction, thus a single arm spectrometer allows measuring the interesting b decay together with tracks from the other b decay, for flavour tagging. The overall detector layout is shown in figure 1. The vertex locator measures all tracks near the interaction point, a dipole magnet and tracking stations after are providing accurate momentum measurement, two RICH detectors, calorimeters and a muon system provide full particle identification.
Highlights
The LHCb experiment is a specialized experiment for B and D physics at the CERN LHC
At LHC, the production is mainly in the forward and backward directions. Both b particles are going in the same direction, a single arm spectrometer allows measuring the interesting b decay together with tracks from the other b decay, for flavour tagging
The particle ID performance can be summarized as 95% efficiency for 5% contamination for the kaons coming from B decays
Summary
At LHC, the production is mainly in the forward and backward directions. Both b particles are going in the same direction, a single arm spectrometer allows measuring the interesting b decay together with tracks from the other b decay, for flavour tagging. The overall detector layout is shown in figure 1. The closest radius is 8 mm, and for that reason the detector is opened during machine injection, and closed only during “stable beam” physics data taking conditions. The mechanical position is reproducible to about 5 micrometres, and the beam position is stable within a fill as shown in figure 2. The resolution is still slightly better on simulation, as shown in figure 3.
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