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<dc:title xml:lang="en">Charmed-strange meson production in proton-proton collisions with the ALICE experiment at the LHC</dc:title>
<dcterms:alternative xml:lang="fr">Étude de la production des mésons charmés-étranges dans les collisions proton-proton avec l’expérience ALICE au LHC</dcterms:alternative>
<dc:subject xml:lang="fr">Plasma de quarks et de gluons</dc:subject>
<dc:subject xml:lang="fr">Interaction forte</dc:subject>
<dc:subject xml:lang="fr">Saveurs lourdes</dc:subject>
<dc:subject xml:lang="fr">Mésons D</dc:subject>
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<dc:subject xml:lang="fr">Collisions proton–proton</dc:subject>
<dc:subject xml:lang="fr">Section efficace de production</dc:subject>
<dc:subject xml:lang="fr">Taux de production en fonction de la multiplicité</dc:subject>
<dc:subject xml:lang="en">Quark-gluon plasma</dc:subject>
<dc:subject xml:lang="en">Strong interaction</dc:subject>
<dc:subject xml:lang="en">Heavy flavour</dc:subject>
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<dc:subject xml:lang="en">Proton–proton collisions</dc:subject>
<dc:subject xml:lang="en">Production cross-section</dc:subject>
<dc:subject xml:lang="en">Production yield as a function of multiplicity</dc:subject>
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<dcterms:abstract xml:lang="fr">La thèse a été effectuée dans le cadre de l’expérience ALICE dédiée à l’étude de la chromodynamique quantique et particulièrement du plasma de quarks et de gluons (PQG) auprès du collisioneur LHC du CERN. Elle porte sur l’étude de la production du méson charmé-étrange D+s , composé d'un quark charmé et d'un quark étrange, dans les collisions proton-proton à une énergie dans le centre de masse = 13TeV. La thèse présente la mesure de la section efficace différentielle de production des mésons à rapidité centrale ( &lt; 0.5) en fonction de l’impulsion transverse. Cette mesure est discutée et comparée aux mesures des mésons D non-étranges et aux prédictions de modèles théoriques. Une étude détaillée de la production des mésons en fonction de la multiplicité en particules chargées de la collision est présentée. Cette mesure contribue à la caractérisation des effets collectifs, de type PQG, dans les collisions proton-proton via le prisme de l'augmentation de l’étrangeté.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The thesis was performed within the ALICE experiment, which is dedicated to the study of strongly interacting matter physics and the quark-gluon plasma (QGP) in ultra-relativistic heavy-ion collisions at the LHC at CERN. The thesis aims at the study of the production of charmed-strange meson, composed of a charm and a strange quark, in proton-proton collisions at a center-of-mass energy of =13 TeV. The measurement of the differential production cross section of mesons at mid-rapidity ( &lt; 0.5) is presented and discussed in comparison with non-strange D meson measurements and with predictions from theory. A study of the meson production as a function of the charged-particle density is presented. The result of this study contribute to the characterisation of QGP-like effects in proton-proton collisions by probing strangeness enhancement with the production of heavy-flavour hadrons.</dcterms:abstract>
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