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Measuring c-quark polarization in W+c samples at ATLAS and CMS

The process $pp \to W^-c$ produces polarized charm quarks. The polarization is expected to be partly retained in $\Lambda_c$ baryons when those form in the $c$-quark hadronization. We argue that it will likely be possible for ATLAS and CMS to measure the $\Lambda_c$ polarization in the $W$+$c$ sampl...

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Autor principal: Kats, Yevgeny
Lenguaje:eng
Publicado: 2015
Materias:
Acceso en línea:https://dx.doi.org/10.1007/JHEP11(2016)011
http://cds.cern.ch/record/2110455
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author Kats, Yevgeny
author_facet Kats, Yevgeny
author_sort Kats, Yevgeny
collection CERN
description The process $pp \to W^-c$ produces polarized charm quarks. The polarization is expected to be partly retained in $\Lambda_c$ baryons when those form in the $c$-quark hadronization. We argue that it will likely be possible for ATLAS and CMS to measure the $\Lambda_c$ polarization in the $W$+$c$ samples in Run 2 of the LHC. This can become the first measurement ever of a longitudinal polarization of charm quarks. Its results will provide a unique input to the understanding of polarization transfer in fragmentation. They will also allow applying the same measurement technique to other (e.g., new physics) samples of charm quarks in which the polarization is a priori unknown. The proposed analysis is similar to the ATLAS and CMS measurements of the $W$+$c$ cross section in the 7 TeV run that used reconstructed $D$-meson decays for charm tagging.
id cern-2110455
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2015
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spelling cern-21104552022-08-10T12:51:45Zdoi:10.1007/JHEP11(2016)011http://cds.cern.ch/record/2110455engKats, YevgenyMeasuring c-quark polarization in W+c samples at ATLAS and CMSParticle Physics - PhenomenologyParticle Physics - ExperimentParticle Physics - PhenomenologyThe process $pp \to W^-c$ produces polarized charm quarks. The polarization is expected to be partly retained in $\Lambda_c$ baryons when those form in the $c$-quark hadronization. We argue that it will likely be possible for ATLAS and CMS to measure the $\Lambda_c$ polarization in the $W$+$c$ samples in Run 2 of the LHC. This can become the first measurement ever of a longitudinal polarization of charm quarks. Its results will provide a unique input to the understanding of polarization transfer in fragmentation. They will also allow applying the same measurement technique to other (e.g., new physics) samples of charm quarks in which the polarization is a priori unknown. The proposed analysis is similar to the ATLAS and CMS measurements of the $W$+$c$ cross section in the 7 TeV run that used reconstructed $D$-meson decays for charm tagging.The process pp → W$^{−}$ c produces polarized charm quarks. The polarization is expected to be partly retained in Λ$_{c}$ baryons when those form in the c-quark hadronization. We argue that it will likely be possible for ATLAS and CMS to measure the Λ$_{c}$ polarization in the W +c samples in Run 2 of the LHC. This can become the first measurement ever of a longitudinal polarization of charm quarks. Its results will provide a unique input to the understanding of polarization transfer in fragmentation. They will also allow applying the same measurement technique to other (e.g., new physics) samples of charm quarks in which the polarization is a priori unknown. The proposed analysis is similar to the ATLAS and CMS measurements of the W +c cross section in the 7 TeV run that used reconstructed D-meson decays for charm tagging.The process $pp \to W^-c$ produces polarized charm quarks. The polarization is expected to be partly retained in $\Lambda_c$ baryons when those form in the $c$-quark hadronization. We argue that it will likely be possible for ATLAS and CMS to measure the $\Lambda_c$ polarization in the $W$+$c$ samples in Run 2 of the LHC. This can become the first measurement ever of a longitudinal polarization of charm quarks. Its results will provide a unique input to the understanding of polarization transfer in fragmentation. They will also allow applying the same measurement technique to other (e.g., new physics) samples of charm quarks in which the polarization is a priori unknown. The proposed analysis is similar to the ATLAS and CMS measurements of the $W$+$c$ cross section in the 7 TeV run that used reconstructed $D$-meson decays for charm tagging.arXiv:1512.00438oai:cds.cern.ch:21104552015-12-01
spellingShingle Particle Physics - Phenomenology
Particle Physics - Experiment
Particle Physics - Phenomenology
Kats, Yevgeny
Measuring c-quark polarization in W+c samples at ATLAS and CMS
title Measuring c-quark polarization in W+c samples at ATLAS and CMS
title_full Measuring c-quark polarization in W+c samples at ATLAS and CMS
title_fullStr Measuring c-quark polarization in W+c samples at ATLAS and CMS
title_full_unstemmed Measuring c-quark polarization in W+c samples at ATLAS and CMS
title_short Measuring c-quark polarization in W+c samples at ATLAS and CMS
title_sort measuring c-quark polarization in w+c samples at atlas and cms
topic Particle Physics - Phenomenology
Particle Physics - Experiment
Particle Physics - Phenomenology
url https://dx.doi.org/10.1007/JHEP11(2016)011
http://cds.cern.ch/record/2110455
work_keys_str_mv AT katsyevgeny measuringcquarkpolarizationinwcsamplesatatlasandcms