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dc.contributor.authorALICE Collaboration
dc.date.accessioned2022-08-18T05:55:01Z
dc.date.available2022-08-18T05:55:01Z
dc.date.issued2022
dc.identifier.citationALICE Collaboration. (2022). Direct observation of the dead-cone effect in quantum chromodynamics. <i>Nature</i>, <i>605</i>(7910), 440-446. <a href="https://doi.org/10.1038/s41586-022-04572-w" target="_blank">https://doi.org/10.1038/s41586-022-04572-w</a>
dc.identifier.otherCONVID_148960402
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/82673
dc.description.abstractIn particle collider experiments, elementary particle interactions with large momentum transfer produce quarks and gluons (known as partons) whose evolution is governed by the strong force, as described by the theory of quantum chromodynamics (QCD)1. These partons subsequently emit further partons in a process that can be described as a parton shower2, which culminates in the formation of detectable hadrons. Studying the pattern of the parton shower is one of the key experimental tools for testing QCD. This pattern is expected to depend on the mass of the initiating parton, through a phenomenon known as the dead-cone effect, which predicts a suppression of the gluon spectrum emitted by a heavy quark of mass mQ and energy E, within a cone of angular size mQ/E around the emitter3. Previously, a direct observation of the dead-cone effect in QCD had not been possible, owing to the challenge of reconstructing the cascading quarks and gluons from the experimentally accessible hadrons. We report the direct observation of the QCD dead cone by using new iterative declustering techniques4,5 to reconstruct the parton shower of charm quarks. This result confirms a fundamental feature of QCD. Furthermore, the measurement of a dead-cone angle constitutes a direct experimental observation of the non-zero mass of the charm quark, which is a fundamental constant in the standard model of particle physics.en
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherNature Publishing Group
dc.relation.ispartofseriesNature
dc.rightsCC BY 4.0
dc.titleDirect observation of the dead-cone effect in quantum chromodynamics
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-202208184214
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.type.coarhttp://purl.org/coar/resource_type/c_2df8fbb1
dc.description.reviewstatuspeerReviewed
dc.format.pagerange440-446
dc.relation.issn0028-0836
dc.relation.numberinseries7910
dc.relation.volume605
dc.type.versionpublishedVersion
dc.rights.copyright© The Author(s) 2022
dc.rights.accesslevelopenAccessfi
dc.subject.ysohiukkasfysiikka
dc.subject.ysokvanttiväridynamiikka
dc.subject.ysokvarkit
dc.format.contentfulltext
jyx.subject.urihttp://www.yso.fi/onto/yso/p15576
jyx.subject.urihttp://www.yso.fi/onto/yso/p39318
jyx.subject.urihttp://www.yso.fi/onto/yso/p19627
dc.rights.urlhttps://creativecommons.org/licenses/by/4.0/
dc.relation.doi10.1038/s41586-022-04572-w
dc.type.okmA1


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