Speaker
Description
The ATLAS detector at the Large Hadron Collider (LHC) has had an extremely successful
data collecting period during 2017, recording over 45 fb-1 of proton-proton collision data at
sqrt(s) = 13 TeV. This was achieved, in part, by running the LHC at a high instantaneous lumi-
nosity level of over 1.5 x 10+34 cm-2s-1, which corresponds to over 57 inelastic proton-proton
collisions per beam crossing. This talk will highlight the tracking and vertexing performance
of the tracking detector within ATLAS (Inner Detector) throughout this successful year of
data taking.
In order to increase its potential for discoveries, the High Luminosity Large Hadron Collider
(HL-LHC) aims to increase the LHC data-set by an order of magnitude by collecting 3,000
fb-1 of recorded data. Starting, from mid-2026, the HL-LHC is expected to reach the peak
instantaneous luminosity of 7.5 x 10+34 cm-2s-1, which corresponds to about 200 inelastic
proton-proton collisions per beam crossing. To cope with the large radiation doses and high
pileup, the current ATLAS Inner Detector will be replaced with a new all-silicon Inner Tracker.
The expected tracking and vertexing performance with the HL-LHC tracker is also presented in
this talk, highlighting the challenges encountered in data taking in a high pileup environment.
