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Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 94: Detektorsysteme VII

T 94.7: Talk

Thursday, March 28, 2019, 17:30–17:45, H10

Simulation of a High-Granularity Timing Detector for the ATLAS Phase-II Upgrade — •Alexander Basan1, Lucia Masetti1, Dirk Zerwas2, Eftychia Tzovara1, and Peter Berta11Johannes Gutenberg University Mainz — 2Universite de Paris-Sud

The high-luminosity Large Hadron Collider (HL-LHC), scheduled to start in 2026, will deliver an instantaneous luminosity of up to 7.5 × 1034 cm−2s−1, which is approximately 5 times larger than the typical luminosities of Run 2. The corresponding increase in the average number of simultaneous pp interactions per bunch crossing (pileup) poses a challenge for the tracking detectors to efficiently assign the charged particles to the production vertices. The performance in terms of heavy-flavor tagging, lepton isolation and the identification of pileup jets will deteriorate especially in the forward region where the spatial resolution is much larger than the inverse of the average pileup density.

The High-Granularity Timing Detector (HGTD) enables the use of high-precision timing information in the forward region to distinguish between collisions occurring very close in space but well-separated in time. With an expected time resolution for minimum-ionising particles of approximately 30 ps and a spread of collision times over a bunch crossing of 175 ps, the amount of pileup can be reduced by a factor of 175/30 ≈ 6.

This talk presents the simulation software for the HGTD and studies on the performance for muons.

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