Sökning: "BESIII"

Visar resultat 1 - 5 av 7 uppsatser innehållade ordet BESIII.

  1. 1. Studies of the J/Ψ → anti-Σ0Σ0 Reaction with BESIII : Event Selection Development

    Master-uppsats, Uppsala universitet/Kärnfysik

    Författare :Benjamin Verbeek; [2023]
    Nyckelord :hyperon; CP; symmetry; event selection; tracks; BES; BESIII; USTC;

    Sammanfattning : The apparent symmetry between matter and antimatter raises the question of why the universe consists of mostly matter. Via an academic exchange to USTC Hefei, a reaction was studied that aims to give insight into this question. LÄS MER

  3. 2. Rare Weak Decays of the Omega Baryon

    Master-uppsats, Uppsala universitet/Kärnfysik

    Författare :Cornelis Johannes Gerardus Mommers; [2022]
    Nyckelord :hadron; physics; nuclear; particle;

    Sammanfattning : We study rare decays of the Omega baryon using SU(3) chiral perturbation theory, a successfuleffective field theory of quantum chromodynamics at low energies. At leading-order, we calculatethe branching fractions of the decay Ω− → Ξππ for all possible combinations of pions. LÄS MER

  4. 3. Maximum Likelihood Estimation of Hyperon Parameters in Python : Facilitating Novel Studies of Fundamental Symmetries with Modern Software Tools

    Kandidat-uppsats, Uppsala universitet/Institutionen för materialvetenskap

    Författare :Benjamin Verbeek; [2021]
    Nyckelord :CP-symmetry; maximum log-likelihood; python; estimation; BESIII; PANDA; hyperon; numba;

    Sammanfattning : In this project, an algorithm has been implemented in Python to estimate the parameters describing the production and decay of a spin 1/2 baryon - antibaryon pair. This decay can give clues about a fundamental asymmetry between matter and antimatter. LÄS MER

  5. 4. Dalitz Plot Analysis of η'→ηπ+π-

    Master-uppsats, Uppsala universitet/Kärnfysik

    Författare :Simon Taylor; [2020]
    Nyckelord :Dalitz Plot Analysis; BESIII; meson physics; maximum likelihood method; chi2 method;

    Sammanfattning : Chiral Perturbation Theory (ChPT) is a tool for studying the strong interaction at low energies. The Perturbation theory is developed around the limit where the light quarks, u,d,s are approximated to be massless. In this approximation the isospin symmetry, one of the main features of the strong interaction, is fulfilled automatically. LÄS MER

  7. 5. Studies of Light Hyperon Decay Parameters

    Kandidat-uppsats, Uppsala universitet/Kärnfysik

    Författare :Annele Heikkilä; [2019]
    Nyckelord :Hadron Physics; Hyperon; CP symmetry; Monte Carlo simulations; BESIII;

    Sammanfattning : A basic assumption in fundamental physics is that equal amounts of matter and antimatter were created after the Big Bang. When particles and antiparticles collide, they annihilate, i.e. disappear and produce photons. LÄS MER