Abstract
The LHCb detector is a forward spectrometer at the Large Hadron Collider (LHC) at CERN. The experiment is designed for precision measurements of CP violation and rare decays of beauty and charm hadrons. In this paper the performance of the various LHCb sub-detectors and the trigger system are described, using data taken from 2010 to 2012. It is shown that the design criteria of the experiment have been met. The excellent performance of the detector has allowed the LHCb collaboration to publish a wide range of physics results, demonstrating LHCb's unique role, both as a heavy flavour experiment and as a general purpose detector in the forward region.
Highlights
Its main goal is to search for indirect evidence of new physics in CP violation and rare decays of beauty and charm hadrons, by looking for the effects of new particles in processes that are precisely predicted in the Standard Model (SM) and by utilising the distinctive flavour structure of the SM with no tree-level flavour-changing neutral currents
Utilising the track samples obtained from these exclusive control decay modes, Fig. 39 demonstrates the kaon efficiency and pion misidentification fraction achieved in LHCb data, as a function of momentum
Despite the fact that these are significantly more challenging than the conditions originally foreseen for the experiment, it has been demonstrated that the performance of each sub-system and the global performance of the detector are in good agreement with the original expectations presented in the LHCb detector paper.[25]
Summary
LHCb is a dedicated heavy flavour physics experiment at the LHC. Its main goal is to search for indirect evidence of new physics in CP violation and rare decays of beauty and charm hadrons, by looking for the effects of new particles in processes that are precisely predicted in the Standard Model (SM) and by utilising the distinctive flavour structure of the SM with no tree-level flavour-changing neutral currents. Less attractive characteristics of the LHC environment are the generally increased background levels encountered, inherent to hadronic collisions, which result in a number of experimental compromises, such as reduced b flavour tagging efficiency and the difficulty in reconstructing final states with missing or neutral particles Despite these challenges, the results[6] obtained from data taken between 2010 and 2013 (LHC Run I) have clearly established LHCb as the generation flavour physics experiment. Thanks to efficient charged particle tracking and dedicated triggers for lepton, hadron and photon signatures, LHCb has the world’s largest sample of exclusively reconstructed charm and beauty decays With these samples, LHCb has already made many key results, such as the first evidence for the rare decay Bs0 → μ+μ−
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