Abstract
The LHCb Outer Tracker is a gaseous detector covering an area of 5 × 6 m2 with 12 double layers of straw tubes. The performance of the detector is presented based on data of the LHC Run 2 running period from 2015 and 2016. Occupancies and operational experience for data collected in pp, pPb and PbPb collisions are described. An updated study of the ageing effects is presented showing no signs of gain deterioration or other radiation damage effects. In addition several improvements with respect to LHC Run 1 data taking are introduced. A novel real-time calibration of the time-alignment of the detector and the alignment of the single monolayers composing detector modules are presented, improving the drift-time and position resolution of the detector by 20%. Finally, a potential use of the improved resolution for the timing of charged tracks is described, showing the possibility to identify low-momentum hadrons with their time-of-flight.
Highlights
The LHCb experiment is dedicated to the study of CP violation and rare decays of hadrons with b and c quarks at the Large Hadron Collider
The tracking system of the detector is composed of a silicon-strip vertex detector, close to the proton-proton interaction region, and five tracking stations: two upstream and three downstream of a dipole magnet with bending power of around 4 Tm
The drift-time measurement capabilities of the Outer Tracker (OT) have been used to measure the time of flight of tracks, which can be exploited for particle identification and for primary interaction vertex assignment and distinction
Summary
Thanks to improvements on the LHC magnets during the Long Shutdown 1 (LS1) period in 2013 and 2014, the LHC provided collisions at a higher centre-of-mass energy of 13 TeV in Run 2 (versus 7 and 8 TeV in Run 1) and proton bunches with a time spacing of 25 ns instead of 50 ns While these conditions are closer to the design values, they are novel, challenging circumstances, motivating the documentation of the performance of the detector in this paper. The drift-time measurement capabilities of the OT have been used to measure the time of flight of tracks, which can be exploited for particle identification and for primary interaction vertex assignment and distinction This method was developed and used for the first time in Run 2, and is presented in section 8 together with its performance
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
