Sökning: "Scalar Dark Matter"

Visar resultat 1 - 5 av 7 uppsatser innehållade orden Scalar Dark Matter.

1. 1. The Higgs Width in Higgs production in association with a W+ boson

   Kandidat-uppsats, Lunds universitet/Fysiska institutionen; Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

   Författare :Wijeratne Mohandiramge Umashi Navisha Fernando; [2023]
   Nyckelord :Higgs boson; Higgs width; off-shell; on-shell; narrow-width approximation; MadGraph5_MC@NLO; W boson; supersymmetry; dark matter; Physics and Astronomy;

   Sammanfattning : The width of the Higgs boson is a quantity that cannot be measured directly from the on-shell Higgs peak; it would have to be measured indirectly. In 2013, Caola and Melnikov developed a method to determine the Higgs width by using off-shell and on-shell cross-sections and applying the narrow-width approximation. LÄS MER

3. 2. Primordial Gravitational Waves and ultra-light Dark Matter in a complex singlet extended Standard Model

   Kandidat-uppsats, Lunds universitet/Partikel- och kärnfysik; Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

   Författare :Sara Wildenor; [2021]
   Nyckelord :theoretical physics; gravitational waves; dark matter; complex singlet extended standard model; LISA; BBO; DECIGO; Physics and Astronomy;

   Sammanfattning : In this thesis, the consequences of extending the internal symmetries of the standard model with a complex singlet scalar field, are investigated in terms of dark matter phenomenology and the possibility of primordial gravitational wave detection utilizing space based laser interferometry. The scalar potential of the model is constructed with a Z2 symmetry, which allows for the retainment of a linear and a quadratic coupling parameter, as well as a stable dark matter candidate, and an additional non-zero vacuum expectation value for the real component of the scalar field. LÄS MER

4. 3. Can Feebly Interacting Massive Particles (FIMP) constitute Dark Matter?

   Master-uppsats, KTH/Fysik

   Författare :Grandharva Appagere; [2021]
   Nyckelord :Dark Matter; Higgs¬portal; Freeze¬-in mechanism; FIMP; C-W Mechanism; Mörk materia; Higgsportal; frys-in-mekanism; FIMP; C-W mekanism;

   Sammanfattning : In this study, we investigate the feasibility of Feebly Interacting Massive particles (FIMP) as possible candidates to constitute the observed Dark Matter abundance in the universe. FIMPs are particles that couple very feebly with known particles in the Standard Model (SM). LÄS MER

5. 4. Impact of loosening the requirement on missing transverse momentum in tt+DMsearches with the ATLAS experiment

   Kandidat-uppsats, Stockholms universitet/Fysikum

   Författare :Alice Knutas; [2021]
   Nyckelord :;

   Sammanfattning : Dark matter is required in the universe to explain certain phenomenona, like the dynamics of stars and temperature fluctuations of the cosmic microwave background. This thesis focuses on the production of dark matter in the ATLAS experiment at the Large Hadron Collider, where the dark matter is detected through momentum conservation. LÄS MER

7. 5. Looking for mono-Z signatures in Z-boson and scalar dark matter interactions

   Kandidat-uppsats, Uppsala universitet/Högenergifysik

   Författare :Magnus Bertilsson; [2021]
   Nyckelord :Scalar Dark Matter; Z boson; Mono-Z signatures;

   Sammanfattning : Even though there is a multitude of observational evidence from cosmology and astrophysics, the standard model does not include a suitable dark matter candidate and therefore physics beyond the standard model is necessary. There are hypotheses of what the particle candidate could be coming from theories such as supersymmetry or extra dimensions. LÄS MER