Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 64: Pixel Detectors III

T 64.4: Talk

Wednesday, March 17, 2021, 16:45–17:00, Tn

Pixel front-end masking and its impact on tracking — Marcello Bindi, Jörn Große-Knetter, •Andreas Kirchhoff, and Arnulf Quadt — II. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany

During Run 2 of the LHC, the ATLAS tracking software masked non-working pixel modules for offline reconstruction. The masking itself is applied if a module does not receive hits (because it is inactive). To improve track reconstruction the number of holes should be reduced. Holes are defined as intersections of reconstructed tracks with sensitive detector elements that did not result in a hit. They are estimated by comparing the hits-on-track with the intersected modules. Inactive modules for example are excluded from the hole definition. As a consequence, a masked module is treated in the track reconstruction as if it received always a hit.

The aim of the ATLAS tracking group for Run 3 is to increase the granularity of the masking (moving from module to single front-ends) in order to reduce the number of pixel holes and increase the tracking efficiency. Hit maps collected at the end of each run were chosen as input of the new front-end masking mechanism. A new data base (DB) scheme was developed in order to integrate the module and the front-end masking information. This scheme will be presented in this talk together with the first studies that quantify the effect of the new masking on the track reconstruction efficiency.