Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 69: Strong Interaction / QCD
T 69.3: Vortrag
Donnerstag, 3. April 2025, 16:45–17:00, VG 0.110
Elastic scattering with the ATLAS-ALFA detector at the LHC — •Per-Oleg Puhl, Hasko Stenzel, and Marko Milovanovic — II. Physikalisches Institut, Justus-Liebig Universität Gießen, D-35392 Gießen
The Absolute Luminosity For ATLAS (ALFA) detector is designed to detect elastic scattering protons under very small scattering angles. Elastic scattering in the very forward direction can be used for the measurement of the total pp cross section and a calibration of the luminosity.
The ALFA detector participated in several special runs of the LHC at high β⋆. In this talk the ALFA detector will be presented and results from Run 1 and Run 2 will be discussed. Special emphasis in this talk will be placed on the special runs from 2018 with β⋆ =90 m at √s = 13 TeV, corresponding to an integrated luminosity of 500 nb−1. In these runs the focus is on elastic scattering at large momentum transfer t and in particular on the dip-bump structure of the differential cross section. The precision of the measurement depends crucially on the alignment of the Roman Pot detectors, for which the preliminary results will be presented.
Keywords: Elastic scattering; LHC; CERN; ATLAS