Evaluation of Timepix3 as a luminosity detector at LHC during 2018 pp collisions at s=13 TeV

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F25%3A00385391" target="_blank" >RIV/68407700:21340/25:00385391 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21670/25:00385391

Result on the web

<a href="https://doi.org/10.1140/epjc/s10052-025-14631-x" target="_blank" >https://doi.org/10.1140/epjc/s10052-025-14631-x</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1140/epjc/s10052-025-14631-x" target="_blank" >10.1140/epjc/s10052-025-14631-x</a>

Result language

angličtina

Original language name

Evaluation of Timepix3 as a luminosity detector at LHC during 2018 pp collisions at s=13 TeV

Original language description

Four Timepix3 detectors were installed in the ATLAS experiment at different positions to study their capabilities to measure luminosity during pp-collisions at sqrt(13) TeV in 2018. While the detectors were operated independently of the ATLAS triggering and acquisition scheme, continuous (dead-time free) measurement together with an orbit clock trigger allowed for synchronization with the LHC. The detectors benefit from a fine segmentation, a pixel pitch of 55 µm, and a per-pixel time resolution of 1.6 ns allowing for a high-quality track reconstruction and particle identification. One of the 500 µm thick silicon sensors was equipped with a 6LiF neutron converter, extending the particle identification capabilities. The installed system was used to study luminosity in different time frames: long term (run-by-run), short term (within a single run) and instantaneous (for each bunch crossing). For the long- and short-term luminosity, partly-independent algorithms: cluster and thermal neutron counting are proposed. A comprehensive analysis of the signal from induced radioactivity and its consecutive removal is presented together with a study demonstrating that the activation-corrected Timepix3 luminosity measurement provides good linearity with respect to the pile-up parameter. For measurement of the instantaneous luminosity, a cluster classification scheme was employed to decompose the measured response to the colliding bunch signal. Selecting a subset of the cluster categories, the signal-to-background ratio was improved and the impact of delayed particles from previous bunches could be reduced. Comparisons performed to the primary bunch-by-bunch luminosity measurement of the ATLAS experiment, provided by the LUCID-2 Cherenkov detector, show a good agreement.ac

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10303 - Particles and field physics

Project

<a href="/en/project/GM23-04869M" target="_blank" >GM23-04869M: Particle identification in high-energy physics experiments and space with advanced detection systems</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

European Physical Journal C

ISSN

1434-6044

e-ISSN

1434-6052

Volume of the periodical

85

Issue of the periodical within the volume

8

Country of publishing house

DE - GERMANY

Number of pages

15

Pages from-to

1-15

UT code for WoS article

001636511200003

EID of the result in the Scopus database

2-s2.0-105015498275