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Measurements of Higgs boson production via gluon-gluon fusion and vector-boson fusion using $H\rightarrow WW^\ast \rightarrow \ellν\ellν$ decays in $pp$ collisions with the ATLAS detector and their effective field theory interpretations

ArXiv 2504.07686 (2025)
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Measurement of high-mass $t\bar{t}\ell^{+}\ell^{-}$ production and lepton flavour universality-inspired effective field theory interpretations at $\sqrt{s}=13$ TeV with the ATLAS detector

ArXiv 2504.05919 (2025)
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Measurement of substructure-dependent suppression of large-radius jets with charged particles in Pb+Pb collisions with ATLAS

ArXiv 2504.04805 (2025)
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Characterization of nuclear breakup as a function of hard-scattering kinematics using dijets measured by ATLAS in $p$+Pb collisions

ArXiv 2504.02638 (2025)
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Measuring the ATLAS ITk pixel detector material via multiple scattering of positrons at the CERN PS

The European Physical Journal C SpringerOpen 85:4 (2025) 381

Authors:

Simon Florian Koch, Brian Moser, Antonín Lindner, Valerio Dao, Ignacio Asensi, Daniela Bortoletto, Marianne Brekkum, Florian Dachs, Hans Ludwig Joos, Milou van Rijnbach, Abhishek Sharma, Ismet Siral, Carlos Solans, Yingjie Wei

Abstract:

The ITk is a new silicon tracker for the ATLAS experiment designed to increase detector resolution, readout capacity, and radiation hardness, in preparation for the larger number of simultaneous proton–proton interactions at the High Luminosity LHC. This paper presents the first direct measurement of the material budget of an ATLAS ITk pixel module, performed at a testbeam at the CERN Proton Synchrotron via the multiple scattering of low energy positrons within the module volume. Using a four plane telescope of thin monolithic pixel detectors from the MALTA Collaboration, scattering datasets were recorded at a beam energy of 1.2GeV. Kink angle distributions were extracted from tracks derived with and without information from the ITk pixel module, and were fit to extract the RMS scattering angle, which was converted to a fractional radiation length x/X0. The average x/X0 across the module was measured as [0.89±0.01(resolution)±0.01(subtraction)±0.08(beam momentum band)]%, which agrees within uncertainties with an estimate of 0.88% derived from material component expectations.
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