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[{"key": "dc.contributor.advisor", "value": "Paukkunen, Hannu", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Helenius, Ilkka", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Alanko, Ville", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2025-04-16T05:02:39Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2025-04-16T05:02:39Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2025", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/101449", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "T\u00e4ss\u00e4 opinn\u00e4ytety\u00f6ss\u00e4 tutkitaan protoni-protoni-t\u00f6rm\u00e4yksiss\u00e4 tapahtuvaa W + ctuottoa massakeskipiste-t\u00f6rm\u00e4ysenergialla \u221a s = 13 TeV. T\u00e4m\u00e4 prosessi voisi auttaa parantamaan ymm\u00e4rryst\u00e4mme outo-kvarkin jakaumasta protonien sis\u00e4ll\u00e4. W\u2213 + D(\u2217)\u00b1-tuottoa, jossa lumo-mesonin D(\u2217)\u00b1 alkuper\u00e4 on lumo-kvarkki, tutkitaan k\u00e4ytt\u00e4m\u00e4ll\u00e4 MCFM:st\u00e4 saatuja johtavan ja toisen kertaluvun differentiaalisia vaikutusaloja, jotka konvoluoidaan fragmentaatiofunktioiden kanssa. Tuloksia verrataan kokeellisiin mittaustuloksiin ATLAS-ilmaisimelta LHC:ss\u00e4 CERNiss\u00e4. Matriisielementtilasku prosessille suoritetaan h\u00e4iri\u00f6teorian johtavassa kertaluvussa, ottaen huomioon nollasta poikkeava lumo-kvarkin massa ja tarkastellen W:n leptonista hajoamiskanavaa. Johtavan kertaluvun tuloksien avulla numeerisesti selvitetyt differentiaaliset vaikutusalat todetaan vastaavan MCFM-ohjelmistolla saatuja tuloksia. Toisen kertaluvun tulokset integroidulle vaikutusalalle W\u2213 + D(\u2217)\u00b1-tuotossa todetaan olevan suurempia kuin mitatut arvot, D\u00b1 mesonien tapauksessa \u223c 6% ja D\u2217\u00b1 mesonien tapauksessa \u223c 15%. D\u00b1 mesonien tapauksessa skaalavariaatiosta ja statistisesta virheest\u00e4 johtuva ep\u00e4varmuus on yhteensopiva mitattujen arvojen ep\u00e4varmuusalueiden kanssa. Kirjallisuudesta l\u00f6ytyv\u00e4t teoriaennusteet ovat l\u00e4hemp\u00e4n\u00e4 kokeellista dataa. Eroa n\u00e4iden ennusteiden ja t\u00e4ss\u00e4 ty\u00f6ss\u00e4 saatujen tulosten v\u00e4lill\u00e4 pohditaan, ja mahdollisiksi syiksi luetellaan erot fragmentaation mallinnuksessa sek\u00e4 eri\u00e4v\u00e4t parametrivalinnat. Lis\u00e4ksi selvitet\u00e4\u00e4n tuottosuhde lumo-antikvarkeille suhteessa lumo-kvarkkeihin, jolle saadaan arvo R\u00b1 c = 0.97\u00b10.03. T\u00e4m\u00e4 vastaa hyvin tarkasti ATLAS-ilmaisimella m\u00e4\u00e4ritetty\u00e4 arvoa R\u00b1 c = 0.971 \u00b1 0.006(stat.)\u00b10.011(syst.)", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "In this thesis, the production of W + c in proton-proton collisions is studied with center-of-mass collision energy \u221a s = 13 TeV. This process could help improve our understanding of the strange quark distribution inside protons. The production of W\u2213 + D(\u2217)\u00b1, where the charmed meson D(\u2217)\u00b1 originates from the charm quark, is studied using leading- and next-to-leading-order differential cross sections from MCFM for the production of W + c, convoluted with fragmentation functions. The results are compared with experimental data from the ATLAS detector at the LHC at CERN. The calculation of the matrix element is performed at leading order in perturbation theory, taking into account the finite charm mass and considering a leptonic decay for the W boson. Differential cross sections derived numerically from the leading order calculation are found to agree with the program MCFM. The next-to-leading order results for the integrated cross section in W\u2213 + D(\u2217)\u00b1 production are found to be higher than the measured values, by \u223c 6% for D\u00b1 and \u223c 15% for D\u2217\u00b1. In the case of D\u00b1, the estimated uncertainty from scale variation and statistical error overlaps with the measurement. However, theoretical predictions found from literature agree more closely with the data. The observed tension between these predictions and our results is discussed, with possible explanations including differences in fragmentation modeling and parameter choices. Furthermore, the production ratio of charm antiquarks to charm quarks is predicted as R\u00b1 c = 0.97 \u00b1 0.03, consistent with the ATLAS measurement of R\u00b1 c = 0.971 \u00b1 0.006(stat.)\u00b10.011(syst.).", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Miia Hakanen (mihakane@jyu.fi) on 2025-04-16T05:02:39Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2025-04-16T05:02:39Z (GMT). No. of bitstreams: 0\n Previous issue date: 2025", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "63", "language": null, "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.language.iso", "value": "eng", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": null, "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "strange quark distribution", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "parton distribution functions", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "charmed meson production", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "vector boson production", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "fragmentation functions", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Simultaneous production of a W boson and a charm in high-energy proton-proton collisions", "language": null, "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-202504163274", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Fysiikan laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Physics", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": null, "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": null, "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Teoreettinen fysiikka", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Theoretical Physics", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.copyright", "value": "\u00a9 The Author(s)", "language": "fi", "element": "rights", "qualifier": "copyright", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.yso", "value": "hiukkasfysiikka", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "alkeishiukkaset", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kvarkit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "bosonit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "hiukkasfysiikan standardimalli", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.description.accessibilityfeature", "value": "unknown accessibility", "language": "en", "element": "description", "qualifier": "accessibilityfeature", "schema": "dc"}, {"key": "dc.description.accessibilityfeature", "value": "ei tietoa saavutettavuudesta", "language": "fi", "element": "description", "qualifier": "accessibilityfeature", "schema": "dc"}]
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