Sökning: "elementarpartiklar"

Visar resultat 1 - 5 av 15 uppsatser innehållade ordet elementarpartiklar.

1. 1. Searching for signatures of compositeness of the Higgs boson

   Master-uppsats, Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation; Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

   Författare :Mårten Bertenstam; [2021]
   Nyckelord :two-Higgs-doublet model; composite Higgs model; composite two-Higgs-doublet model; phase transition; cosmological phase transition; electroweak phase transition; gravitational waves; gravitational wave background; Physics and Astronomy;

   Sammanfattning : In this master thesis we consider some phenomenological aspects of two-Higgs-doublet models, both elementary and composite ones. The emphasis is on calculating and understanding first order phase transitions in such models, constrained to be in agreement with existing collider data on the Higgs sector. LÄS MER

3. 2. Exploring the Gauge Sector of a Composite Two-Higgs Doublet Model

   Kandidat-uppsats, Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

   Författare :Adam Warnerbring; [2021]
   Nyckelord :two-Higgs doublet model; composite Higgs model; composite two-Higgs doublet model; Physics and Astronomy;

   Sammanfattning : In this bachelor thesis we investigate the gauge sector of a specific composite two-Higgs doublet model, allowing more freedom for the gauge couplings and compositeness scales. From the underlying parameters we generate model realisations with the correct top mass, Higgs mass and electroweak vacuum expectation value, that satisfy theoretical constraints such as unitarity and perturbativity. LÄS MER

4. 3. Hur utvecklas förståelsen? : Materiens partikelnatur och progressionen i grundskolan.

   Uppsats för yrkesexamina på grundnivå, Jönköping University/Högskolan för lärande och kommunikation

   Författare :Malin Lidén; Josefin Sahlberg; [2021]
   Nyckelord :Materiens partikelnatur; partikelmodellen; atomer; molekyler; partiklar; elementarpartiklar; progression; förståelse; grundskola; basic particle theory.;

   Sammanfattning : I arbetet undersöks hur elevers progression mot en förståelse för materiens partikelnatur beskrivs i aktuella forskningsstudier. En systematisk litteratursökning leder fram till 10 vetenskapliga arbeten som alla behandlar elevers progression i ämnet. LÄS MER

5. 4. Using Graph Neural Networks for Track Classification and Time Determination of Primary Vertices in the ATLAS Experiment

   Master-uppsats, KTH/Matematisk statistik

   Författare :Mattias Gullstrand; Stefan Maraš; [2020]
   Nyckelord :Time determination; graph neural network; graph attentional network; HGTD; vertex; node classification; particle physics; machine learning; Tidsbestämning; neurala grafnätverk; uppvaktande grafnätverk; HGTD; vertex; nodklassificering; partikelfysik; statistisk inlärning;

   Sammanfattning : Starting in 2027, the high-luminosity Large Hadron Collider (HL-LHC) will begin operation and allow higher-precision measurements and searches for new physics processes between elementary particles. One central problem that arises in the ATLAS detector when reconstructing event information is to separate the rare and interesting hard scatter (HS) interactions from uninteresting pileup (PU) interactions in a spatially compact environment. LÄS MER

7. 5. The Chirality-Flow Method for Massive and Electroweak Amplitudes

   Master-uppsats, Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

   Författare :Joakim Alnefjord; [2020]
   Nyckelord :chirality-flow; chirality; flow; spinor-helicity; tree-level; diagram; amplitude; Physics and Astronomy;

   Sammanfattning : In this thesis I extend the chirality-flow method to the full standard model at tree-level by including massive particles and electroweak interactions. The chirality-flow method is a new diagrammatic method for calculating Feynman diagrams that is based on the spinor-helicity formalism, that before this thesis was written had been worked out for massless QED and QCD at tree-level. LÄS MER