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[{"key": "dc.contributor.advisor", "value": "Eskola, Kari J.", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "L\u00f6yt\u00e4inen, Topi", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2017-10-17T14:24:09Z", "language": "", "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2017-10-17T14:24:09Z", "language": "", "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2017", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1726496", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/55650", "language": "", "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Alimman kertaluvun h\u00e4iri\u00f6teoreettisia kvanttikentt\u00e4teorialaskuja sidottujen tilojen\r\nhajoamisleveyksille. \r\nTy\u00f6ss\u00e4 lasketaan sidottujen tilojen hajoamisleveydet prosesseille $J/ \\psi \\rightarrow l^+ l^-$, $\\eta_c \\rightarrow gg$, $\\text{O-Ps}\\rightarrow \\gamma\\gamma\\gamma$, $J/ \\psi \\rightarrow ggg$ ja $J/ \\psi \\rightarrow \\gamma gg$. Prosessit lasketaan perturbatiivisen QED:n ja QCD:n alimmassa kertaluvussa. Laskuissa k\u00e4yd\u00e4\u00e4n l\u00e4pi kolme erilaista tekniikkaa invariantin amplitudin k\u00e4sittelemiseksi. Johdetut hajoamisleveystulokset k\u00e4yv\u00e4t yksiin kirjallisuudesta l\u00f6ytyvien tulosten kanssa. Lis\u00e4ksi tarkastellaan kokeellisesti varmistettavissa olevia hajoamisleveyssuhteita. Teoreettiset ennusteet ovat $R^{J/\\psi}_{1\\text{th}} = \\Gamma(J/\\psi\\rightarrow\\gamma gg)/\\Gamma(J/\\psi \\rightarrow ggg) \\approx 0.104$ sek\u00e4 $R^{J/\\psi}_{2\\text{th}} = \\Gamma (J/ \\psi \\rightarrow l^+ l^-) / \\Gamma (J/ \\psi \\rightarrow ggg) \\approx 0.060$, jotka ovat melko l\u00e4hell\u00e4 kokeellisia arvoja. Lopuksi argumentoidaan, ett\u00e4 tulokset voidaan yleist\u00e4\u00e4 koskemaan muita raskaita mesoneita joilla on samat kvanttiluvut.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "The bound state decay widths of the processes $J/ \\psi \\rightarrow l^+ l^-$, $\\eta_c \\rightarrow gg$, $\\text{O-Ps}\\rightarrow \\gamma\\gamma\\gamma$, $J/ \\psi \\rightarrow ggg$ and $J/ \\psi \\rightarrow \\gamma gg$ are derived in the lowest order perturbative theory of QED and QCD. In these calculations, three different methods for processing the invariant amplitude are presented. The derived decay width results agree with the established ones in the literature. Moreover, experimentally verifiable ratios between calculated decay widths are presented. The theoretical predictions are $R^{J/\\psi}_{1\\text{th}} = \\Gamma(J/\\psi\\rightarrow\\gamma gg)/\\Gamma(J/\\psi \\rightarrow ggg) \\approx 0.104$ and $R^{J/\\psi}_{2\\text{th}} = \\Gamma (J/ \\psi \\rightarrow l^+ l^-) / \\Gamma (J/ \\psi \\rightarrow ggg) \\approx 0.060$, which agree relatively well with experimental results. Finally it is argued that the development can be generalized for other heavy mesons with the same quantum numbers.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Topi L\u00f6yt\u00e4inen (tomaollo) on 2017-10-17 14:24:08.273254. Form: Pro gradu -lomake (https://kirjasto.jyu.fi/julkaisut/julkaisulomakkeet/pro-gradu-lomake). JyX data: [jyx_publishing-allowed (fi) =True]", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by jyx lomake-julkaisija (jyx-julkaisija.group@korppi.jyu.fi) on 2017-10-17T14:24:09Z\r\nNo. of bitstreams: 2\r\nURN:NBN:fi:jyu-201710174018.pdf: 2865652 bytes, checksum: 7995b0ebc30430adebbfbd079bd75f98 (MD5)\r\nlicense.html: 4850 bytes, checksum: f654391069e03e76c4e9e30c00d351f6 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2017-10-17T14:24:09Z (GMT). No. of bitstreams: 2\r\nURN:NBN:fi:jyu-201710174018.pdf: 2865652 bytes, checksum: 7995b0ebc30430adebbfbd079bd75f98 (MD5)\r\nlicense.html: 4850 bytes, checksum: f654391069e03e76c4e9e30c00d351f6 (MD5)\r\n Previous issue date: 2017", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (68 sivua)", "language": null, "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "eng", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "sidottu tila", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "perturbatiivinen QFT", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "mesonit", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "bound state", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "particle decays", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "perturbative QFT", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "meson", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Lowest order perturbative quantum field theory calculations of bound state decay widths", "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-201710174018", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "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": 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