| Preprint | |
| Report number | arXiv:2412.04686 |
| Title | Measuring the ATLAS ITk Pixel Detector Material via Multiple Scattering of Positrons at the CERN PS |
| Author(s) | Koch, Simon Florian (Oxford U.) ; Moser, Brian (Oxford U. ; CERN) ; Lindner, Antonín (CERN) ; Dao, Valerio (CERN ; SUNY, Stony Brook) ; Asensi, Ignacio (CERN) ; Bortoletto, Daniela (Oxford U.) ; Brekkum, Marianne (CERN) ; Dachs, Florian (CERN) ; Joos, Hans Ludwig (CERN ; Gottingen U., II. Phys. Inst.) ; van Rijnbach, Milou (CERN ; Oslo U.) ; Sharma, Abhishek (CERN) ; Siral, Ismet (CERN) ; Solans, Carlos (CERN) ; Wei, Yingjie (Oxford U.) |
| Document contact | Contact: arXiv |
| Imprint | 2024-12-05 |
| Number of pages | 12 |
| Note | 12 pages, 12 figures |
| Subject category | hep-ex ; Particle Physics - Experiment ; physics.ins-det ; Detectors and Experimental Techniques |
| Accelerator/Facility, Experiment | CERN PS CERN LHC ; ATLAS |
| 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 $1.2\,\text{GeV}$. 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 $x/X_0$. The average $x/X_0$ across the module was measured as $[0.89 \pm 0.01 \text{ (resolution)} \pm 0.01 \text{ (subtraction)} \pm 0.08 \text{ (beam momentum band)}]\%$, which agrees within uncertainties with an estimate of $0.88\%$ derived from material component expectations. |
| Other source | Inspire |
| Copyright/License | preprint: (License: CC BY 4.0) |
Record created 2024-12-10, last modified 2024-12-11
