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Measuring quark polarizations at ATLAS and CMS

Being able to measure the polarization of quarks produced in various processesat the LHC would be of fundamental significance. Measuring the polarizations ofquarks produced in new physics processes, once discovered, can provide crucialinformation about the new physics Lagrangian. In a series of rece...

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Autor principal: Kats, Yevgeny
Lenguaje:eng
Publicado: 2018
Materias:
Acceso en línea:http://cds.cern.ch/record/2319840
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author Kats, Yevgeny
author_facet Kats, Yevgeny
author_sort Kats, Yevgeny
collection CERN
description Being able to measure the polarization of quarks produced in various processesat the LHC would be of fundamental significance. Measuring the polarizations ofquarks produced in new physics processes, once discovered, can provide crucialinformation about the new physics Lagrangian. In a series of recent papers, wehave investigated how quark polarization measurements can be done in practice.The polarizations of heavy quarks (b and c) are expected to be largely preservedin the lightest baryons they hadronize into, the Λ b and Λ c , respectively.Furthermore, it is known experimentally that s-quark polarization is preservedas well, in Λ baryons. We study how ATLAS and CMS can measure polarizations ofb, c and s quarks using certain decays of these baryons. We propose to use theStandard Model t ¯ t and W c samples to calibrate these measurements. Weestimate that the Run 2 dataset will suffice for measuring the quarkpolarizations in these Standard Model samples with precisions of order 10%. Wealso propose various additional measurements for the near and far future thatwould help characterize the polarization transfer from the quarks to thebaryons.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2018
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spelling cern-23198402023-05-21T07:18:31Zhttp://cds.cern.ch/record/2319840engKats, YevgenyMeasuring quark polarizations at ATLAS and CMShep-exParticle Physics - Experimenthep-phParticle Physics - PhenomenologyBeing able to measure the polarization of quarks produced in various processesat the LHC would be of fundamental significance. Measuring the polarizations ofquarks produced in new physics processes, once discovered, can provide crucialinformation about the new physics Lagrangian. In a series of recent papers, wehave investigated how quark polarization measurements can be done in practice.The polarizations of heavy quarks (b and c) are expected to be largely preservedin the lightest baryons they hadronize into, the Λ b and Λ c , respectively.Furthermore, it is known experimentally that s-quark polarization is preservedas well, in Λ baryons. We study how ATLAS and CMS can measure polarizations ofb, c and s quarks using certain decays of these baryons. We propose to use theStandard Model t ¯ t and W c samples to calibrate these measurements. Weestimate that the Run 2 dataset will suffice for measuring the quarkpolarizations in these Standard Model samples with precisions of order 10%. Wealso propose various additional measurements for the near and far future thatwould help characterize the polarization transfer from the quarks to thebaryons.Being able to measure the polarization of quarks produced in various processes at the LHC would be of fundamental significance. Measuring the polarizations of quarks produced in new physics processes, once discovered, can provide crucial information about the new physics Lagrangian. In a series of recent papers, we have investigated how quark polarization measurements can be done in practice. The polarizations of heavy quarks (b and c) are expected to be largely preserved in the lightest baryons they hadronize into, the Lambda_b and Lambda_c, respectively. Furthermore, it is known experimentally that s-quark polarization is preserved as well, in Lambda baryons. We study how ATLAS and CMS can measure polarizations of b, c and s quarks using certain decays of these baryons. We propose to use the Standard Model ttbar and Wc samples to calibrate these measurements. We estimate that the Run 2 dataset will suffice for measuring the quark polarizations in these Standard Model samples with precisions of order 10%. We also propose various additional measurements for the near and far future that would help characterize the polarization transfer from the quarks to the baryons.arXiv:1805.02957oai:cds.cern.ch:23198402018-05-08
spellingShingle hep-ex
Particle Physics - Experiment
hep-ph
Particle Physics - Phenomenology
Kats, Yevgeny
Measuring quark polarizations at ATLAS and CMS
title Measuring quark polarizations at ATLAS and CMS
title_full Measuring quark polarizations at ATLAS and CMS
title_fullStr Measuring quark polarizations at ATLAS and CMS
title_full_unstemmed Measuring quark polarizations at ATLAS and CMS
title_short Measuring quark polarizations at ATLAS and CMS
title_sort measuring quark polarizations at atlas and cms
topic hep-ex
Particle Physics - Experiment
hep-ph
Particle Physics - Phenomenology
url http://cds.cern.ch/record/2319840
work_keys_str_mv AT katsyevgeny measuringquarkpolarizationsatatlasandcms