Raskaiden kvarkkiparien tuotto protoni–protoni- ja protoni–antiprotoni-törmäyksissä kvanttiväridynamiikan häiriöteorian alimmassa kertaluvussa
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2021Copyright
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Tässä opinnäytetyössä on tutkittu kvanttiväridynamiikan häiriöteorian alimman kertaluvun c-, b- ja t-kvarkkiparien tuottoa protoni–protoni- ja protoni–antiprotoni-törmäyksissä. Useita alimman kertaluvun kokonais-, differentioituja ja kinemaattisesti leikattuja vaikutusaloja on laskettu käsitellen lopputilan kvarkkeja massiivisina. Vaikutusalojen herkkyyttä raskaan kvarkin massan, renormalisaatio- ja faktorisaatioskaalojen arvojen vaihteluille on tarkasteltu. Teoreettisten ja vastaavien kokeellisten vaikutusalojen eroavaisuudet on kvantifioitu K-kertoimien avulla. Tuloksista selviää, että K-kertoimet ovat samat alimman kertaluvun vaikutusaloille, joiden tarkasteltu törmäysprosessi, renormalisaatio- ja faktorisaatioskaalat ovat samat. In this master's thesis the theoretical yields of c, b and t quark pairs in proton-proton and proton-antiproton collisions have been studied via the lowest order perturbation theory of quantum chromodynamics. Several lowest order total, differential and kinematically cut cross sections have been calculated while treating the final state quarks massive. Sensitivity of the cross sections to variations of heavy quark mass, renormalization and factorization scales are examined. Differences between the theoretical and corresponding experimental cross sections have been quantified with K factors. The results indicate that K factors of two different lowest order cross sections correspond to each other if the cross sections examine the same collision process and have the same renormalization and factorization scales.
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- Pro gradu -tutkielmat [29624]
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