Difference between revisions of "Bachelor student Projects"

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Many theories that try to solve shortcomings of the Standard Model propose that the top quark, the most massive particle in the Standard Model, may have a partner. Supersymmetry, for example, predicts a spin-0 partner of the top quark, but does not predict its mass. The ATLAS experiment at the LHC is well equipped to search for heavy new particles that may be produced in high-energy proton-proton collisions. In this bachelor project we will try to improve the criteria that ATLAS uses to search for supersymmetric top quarks, focusing in particular on very massive particles with masses around 1 TeV.In order to select supersymmetric top quark candidates (the signal) in the ATLAS data we must apply selection criteria that cut away events that are not produced by supersymmetric top quarks (the background, or the noise). These selection criteria must be designed to be very effective for noise-reduction, while retaining as much of the signal as possible.
 
Many theories that try to solve shortcomings of the Standard Model propose that the top quark, the most massive particle in the Standard Model, may have a partner. Supersymmetry, for example, predicts a spin-0 partner of the top quark, but does not predict its mass. The ATLAS experiment at the LHC is well equipped to search for heavy new particles that may be produced in high-energy proton-proton collisions. In this bachelor project we will try to improve the criteria that ATLAS uses to search for supersymmetric top quarks, focusing in particular on very massive particles with masses around 1 TeV.In order to select supersymmetric top quark candidates (the signal) in the ATLAS data we must apply selection criteria that cut away events that are not produced by supersymmetric top quarks (the background, or the noise). These selection criteria must be designed to be very effective for noise-reduction, while retaining as much of the signal as possible.
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! style="background:#339999;" | <font color=#ffffff> 5) Higgs spin </font>
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''' Supervisors:'''  Peter Kluit (staf) and Koen Oussoren (PhD student)
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''' Research description: '''
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Het Standaard Model voorspelt dat het Higgs deeltje geen intrinsieke spin heeft. Het Higgs deeltje zou daarmee het eerste elementaire scalaire deeltje zijn. Maar is dit ook zo? Je kunt ook modellen opstellen waar het Higgs deeltje een spin 1 of spin 2 heeft.
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In dit project gaan we kijken hoe je deze verschillende modellen kunt onderscheiden voor het geval dat een Higgs deeltje uiteenvalt in twee W-bosonen. Daarna kijken we hoe de hoek verdelingen van de W-bosonen van de spin van de Higgs afhangen. Deze informatie kunnen we dan vergelijken met de data die door het ATLAS experiment is genomen.
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Bij dit project is plaats voor twee studenten. De ene student kan zich toeleggen op modulering van de hoekverdelingen van de W-bosonen. De andere student legt de nadruk op vergelijking met de experimentele gegevens.

Revision as of 09:50, 6 February 2014