Abstract
Stable, precise spatial alignment and PID calibration are necessary to achieve optimal detector performance. During Run2, LHCb will have a new real-time detector alignment and calibration to allow equivalent performance in the online and offline reconstruction to be reached. This offers the opportunity to optimise the event selection by applying stronger constraints, and to use hadronic particle identification at the trigger level. The computing time constraints are met through the use of a new dedicated framework using the multi-core farm infrastructure for the trigger. The motivation for a real-time alignment and calibration of the LHCb detector is discussed from the operative and physics performance point of view. Specific challenges of this configuration are discussed, as well as the designed framework and its performance.
Highlights
Importance of alignment and calibrationThe spatial alignment of the detector and the accurate calibration of its subcomponents are essential elements to achieve the best physics performance, e.g. mass and impact paramenter resolution
Minimize the difference between online and offline performance
Dedicated data sample to perform alignment or calibration collected with a specific trigger selection line for each task
Summary
The spatial alignment of the detector and the accurate calibration of its subcomponents are essential elements to achieve the best physics performance, e.g. mass and impact paramenter resolution. The complete calibration of RICH detectors allows an exclusive selection using particle identification criteria
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