Sep 12 – 17, 2021
University of Birmingham
Europe/London timezone

Tracker alignment of the CMS detector

Sep 15, 2021, 4:01 PM
Teaching and Learning Building (University of Birmingham)

Teaching and Learning Building

University of Birmingham

Edgbaston Campus University of Birmingham B15 2TT UK
poster Applications in Particle Physics Poster Session 3 (Applications in Particle Physics)


Nazar Bartosik (Universita e INFN Torino (IT))


The positions of the nearly twenty-thousand silicon sensors of the CMS central tracking system must be determined with a precision better than their intrinsic resolution in order to provide an optimal reconstruction of charged particle trajectories. The procedure, referred to as alignment, includes also the adjustment of the orientations and the determination of the deviation from flatness of the sensor surfaces.

Data-driven methods used to carefully align the detector and validate the alignment will be presented with CMS Run-2 data, collected from 2016 to 2018. Systematic distortions such as weak modes are discussed, as well as the impact of the variation of the conditions during data taking over time, in particular effects related to the radiation damage.

Finally, we illustrate the impact on physics of the recent developments included in the legacy reprocessing, which was performed with the aim to greatly improve the physics potential for precision measurements, such as the reconstruction of the invariant mass spectrum of the dilepton systems.

Institute INFN Torino, Italy
Nationality Ukraine
Your name Nazar Bartosik

Primary author

Nazar Bartosik (Universita e INFN Torino (IT))

Presentation materials