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A Monte Carlo simulation of neutral-current deep inelastic scattering in parton model

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Authors
Laulainen, Joni
Date
2022
Discipline
FysiikkaPhysics
Copyright
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Työn tavoitteena on simuloida syvästi epäelastista elektroni-protoni -sirontaa hyödyntäen Monte Carlo -menetelmiä. Prosessin differentiaalinen vaikutusala johdetaan häiriöteoreettisen kvanttiväridynamiikan ensimmäisessä kertaluvussa. Lorentz-invariantit suureet x ja Q^2 poimitaan vaikutusalasta käyttäen Monte Carlo -valintaa jakaumasta, ja sirontaprosessin kinematiikka rakennetaan. Lopputilan hiukkasia käyttämällä kerätään jakaumat invariantista massasta W, epäelastisuudesta y ja poikittaisliikemäärästä p_T. Tulokset vastaavat samanlaisen törmäysasetelman jakaumia PYTHIA-eventtigeneraattorista massattomien kvarkkien tapauksessa, mutta massojen lisääminen aiheuttaa eroavaisuuksia jakaumien välillä.
 
With the aim to simulate the neutral-current deep inelastic electron-proton scattering using Monte Carlo methods, the differential cross section is derived in the leading order of perturbative quantum chromodynamics. Making use of Monte Carlo sampling from a distribution, the Lorentz-invariant quantities x and Q^2 are drawn from the cross section, and the kinematics of the scattering process built. The final state particles are used to gather distributions of invariant mass W, inelasticity y and transverse momentum p_T. The results are compared to distributions from PYTHIA event generator for a similar collision event setup. Distributions with massless quarks agree, but adding masses to the quarks results in greater differences between the distributions.
 
Keywords
Monte Carlo -menetelmät hiukkasfysiikka simulointi sironta kvarkit leptonit Monte Carlo methods particle physics simulation scattering (physics) quarks leptons
URI

http://urn.fi/URN:NBN:fi:jyu-202206233620

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