magistrsko delo
David Susič (Author), Svjetlana Fajfer (Mentor)

Abstract

Osnovne delce in njihove medsebojne interakcije opisuje teorija, znana kot standardni model. Kljub njegovim izjemno dobrim ujemanjem z ogromno količino eksperimentalnih podatkov standardni model med drugim ne zna pojasniti mas nevtrinov, barionske asimetrije ter izvira temne snovi. Omenjene pomanjkljivosti standardnega modela je mogoče razložiti znotraj okvirjev teorij velikega poenotenja, ki so od standardnega modela bolj fundamentalne, hkrati pa upoštevajo številne njegove principe. Teorije velikega poenotenja kot kandidata delca temne snovi navajajo nevidni desnoročni fermion, ki ga interpretiramo kot desnoročni nevtrino, delec, ki ga standardni model ne dovoljuje. Interakcije tega delca s kvarki posreduje hipotetični barvni skalar, imenovan leptokvark, sklopitve s tem skalarjem pa so zaradi njegove visoke mase zadušene. V tem delu so obravnavani hipotetični razpadi protona in nevtrona, inducirani s strani barvnih skalarjev. Poseben poudarek je na iskanju takih razpadov nevtrona v delec temne snovi, ki obenem prepovedujejo destabilizacijo protona, ter na odkrivanju nevtronskega razpadnega kanala, ki pojasnjuje anomalijo nevtronskega življenjskega časa. Rezultati, pridobljeni v tej nalogi, služijo kot izhodišče za nadaljnje teoretiče in eksperimentale raziskave nukleonskih razpadov ter iskanje nevidnih delcev, ki tvorijo temno snov.

Keywords

fizika osnovnih delcev;protonski razpadi;nevtronski razpadi;desnoročni nevtrino;nevidna snov;temna snov;leptokvarki;anomalija nevtronskega življenjskega časa;teorije velikega poenotenja;standardni model;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FMF - Faculty of Mathematics and Physics
Publisher: [D. Susič]
UDC: 539.1
COBISS: 27961859 Link will open in a new window
Views: 440
Downloads: 94
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Other data

Secondary language: English
Secondary title: Dark matter nucleon decay
Secondary abstract: Elementary particles and their interactions are described by the theory, known as the Standard Model. Despite the fact that it successfully describes an enormous amount of experimental data, the Standard Model cannot describe neutrino masses, baryon asymmetry and does not provide a source for the dark matter. These aspects suggest that the Standard Model should be a part of a more fundamental theory, examples of which are the Grand Unified Theories. Grand Unified Theories propose the source of the dark matter to be an invisible right-handed fermion, which can be interpreted as the right-handed neutrino, a particle not included in the Standard Model. Interactions between this dark matter candidate and quarks are induced by a colored scalar particle, called leptoquark, the couplings of which are suppressed due to its extremely high mass. This work studies hypothetical proton and neutron decays, induced by the massive colored scalars. The emphasis is on the search of such neutron decays into dark matter particle, which simultaneously prevent destabilization of the proton, and on the search of neutron decay mode, explaining the neutron lifetime anomaly. The results of this work serve as a basis for future theoretical and experimental researches of nucleon decays as well as for future searches of dark particles.
Secondary keywords: physics of elementary particles;proton decay;neutron decay;right-handed neutrino;dark matter;leptoquarks;neutron lifetime anomaly;Grand Unified Theories;Standard Model;
Type (COBISS): Master's thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za matematiko in fiziko, Oddelek za fiziko
Pages: 74 str.
ID: 12033070