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Optimising top-quark threshold scan at CLIC using genetic algorithm

One of the important goals at the future e+e− colliders is to measure the top-quark mass and width in a scan of the pair production threshold. However, the shape of the pair-production cross section at the threshold depends also on other model parameters, as the top Yukawa coupling, and the measurem...

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Detalles Bibliográficos
Autores principales: Zarnecki, Aleksander, Nowak, K
Lenguaje:eng
Publicado: 2021
Materias:
Acceso en línea:http://cds.cern.ch/record/2759350
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author Zarnecki, Aleksander
Nowak, K
author_facet Zarnecki, Aleksander
Nowak, K
author_sort Zarnecki, Aleksander
collection CERN
description One of the important goals at the future e+e− colliders is to measure the top-quark mass and width in a scan of the pair production threshold. However, the shape of the pair-production cross section at the threshold depends also on other model parameters, as the top Yukawa coupling, and the measurement is a subject to many systematic uncertainties. Presented in this work is the study of the top-quark mass determination from the threshold scan at CLIC. The most general approach is used with all relevant model parameters and selected systematic uncertainties included in the fit procedure. Expected constraints from other measurements are also taken into account. It is demonstrated that the top-quark mass can be extracted with precision of the order of 30 to 40 MeV, including considered systematic un- certainties, already for 100 $\mathrm{fb}^{−1}$ of data collected at the threshold. Additional improvement is possible, if the running scenario is optimised. With the optimisation procedure based on the genetic algorithm the statistical uncertainty of the mass measurement can be reduced by about 20-30%. Influence of the collider luminosity spectra on the expected precision of the measurement is also studied.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2021
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spelling cern-27593502021-03-29T21:48:18Zhttp://cds.cern.ch/record/2759350engZarnecki, AleksanderNowak, KOptimising top-quark threshold scan at CLIC using genetic algorithmParticle Physics - ExperimentOne of the important goals at the future e+e− colliders is to measure the top-quark mass and width in a scan of the pair production threshold. However, the shape of the pair-production cross section at the threshold depends also on other model parameters, as the top Yukawa coupling, and the measurement is a subject to many systematic uncertainties. Presented in this work is the study of the top-quark mass determination from the threshold scan at CLIC. The most general approach is used with all relevant model parameters and selected systematic uncertainties included in the fit procedure. Expected constraints from other measurements are also taken into account. It is demonstrated that the top-quark mass can be extracted with precision of the order of 30 to 40 MeV, including considered systematic un- certainties, already for 100 $\mathrm{fb}^{−1}$ of data collected at the threshold. Additional improvement is possible, if the running scenario is optimised. With the optimisation procedure based on the genetic algorithm the statistical uncertainty of the mass measurement can be reduced by about 20-30%. Influence of the collider luminosity spectra on the expected precision of the measurement is also studied.CLICdp-Pub-2021-002oai:cds.cern.ch:27593502021
spellingShingle Particle Physics - Experiment
Zarnecki, Aleksander
Nowak, K
Optimising top-quark threshold scan at CLIC using genetic algorithm
title Optimising top-quark threshold scan at CLIC using genetic algorithm
title_full Optimising top-quark threshold scan at CLIC using genetic algorithm
title_fullStr Optimising top-quark threshold scan at CLIC using genetic algorithm
title_full_unstemmed Optimising top-quark threshold scan at CLIC using genetic algorithm
title_short Optimising top-quark threshold scan at CLIC using genetic algorithm
title_sort optimising top-quark threshold scan at clic using genetic algorithm
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2759350
work_keys_str_mv AT zarneckialeksander optimisingtopquarkthresholdscanatclicusinggeneticalgorithm
AT nowakk optimisingtopquarkthresholdscanatclicusinggeneticalgorithm