Proton reconstruction with the TOTEM Roman pot detectors for high-β* LHC data
(2025) Journal of Instrumentation — Vol. 20 (2025)
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- The TOTEM Roman pot detectors are used to reconstruct thetransverse momentum of scattered protons and to estimate thetransverse location of the primary interaction. This paper presentsnew methods of track reconstruction, measurements of strip-leveldetection efficiencies, cross-checks of the LHC beam optics, anddetector alignment techniques, along with their application in theselection of signal collision events. The track reconstruction isperformed by exploiting hit cluster information through a novelmethod using a common polygonal area in the intercept-slopeplane. The technique is applied in the relative alignment ofdetector layers with μm precision. A tag-and-probe method isused to extract strip-level detection efficiencies. The alignment ofthe Roman pot system is performed through time-dependentadjustments, resulting in a position accuracy of 3 μm in thehorizontal and 60 μm in the vertical directions. The goal isto provide an optimal reconstruction tool for central exclusivephysics analyses based on the high-β* data-taking period at√(s) = 13 TeV in 2018.
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Benecke, A., Bethani, A., Bruno, G., Caputo, C., de Favereau de Jeneret, J., Delaere, C., Donertas, I. S., Giammanco, A., Guzel, A. O., Jain, S., Jain, S., Lemaitre, V., Lidrych, J., Mastrapasqua, P., Tran, T. T., CMS, TOTEM, & et al. (2025). Proton reconstruction with the TOTEM Roman pot detectors for high-β* LHC data. Journal of Instrumentation, 20. https://doi.org/10.1088/1748-0221/20/04/P04012 (Original work published 2025)