Sökning: "chiral"

Visar resultat 16 - 20 av 51 uppsatser innehållade ordet chiral.

  1. 16. 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

  3. 17. Formulation of Model Problem for Chirality Induced Spin Selectivity Effect

    Kandidat-uppsats, Uppsala universitet/Materialteori

    Författare :Henrik Bruce; [2020]
    Nyckelord :Chirality; Spin selectivity; CISS;

    Sammanfattning : Spin dependent electron transport in chiral molecules, the so-called chirality induced spin selectivity (CISS) effect, have attracted much attention over the past few years. Experimentally the spin polarization has been detected, and there is a theoretical consensus on the necessity of both spin-orbit coupling and geometrical helicity in order to get a non-vanishing spin polarization. LÄS MER

  4. 18. Helicity amplitudes for the transition from the spin-3/2 Sigma to the Lambda hyperon

    Master-uppsats, Uppsala universitet/Kärnfysik

    Författare :Olov Junker; [2020]
    Nyckelord :hyperons; helicity amplitudes; dispersion theory; chiral perturbation theory;

    Sammanfattning : The helicity amplitudes of the scattering reaction Sigma* bar Lambda -> pi+ pi- at energies below 1 GeV are calculated. They are part of a project of determining the low energy Sigma* to Lambda transition form factors using dispersion theory. The helicity amplitudes require the Feynman amplitudes of Sigma* bar Lambda -> pi+ pi- as input. LÄS MER

  5. 19. Photoredox catalysis with 10-phenyl-10H- phenothiazine and synthesis of a photocatalytic chiral proline-based organocatalyst

    Master-uppsats, KTH/Organisk kemi

    Författare :Panagiotis Lamprianidis; [2020]
    Nyckelord :organic chemistry; photocatalysis; organocatalysis; organocatalyst; organic synthesis; organisk kemi; fotokatalys; organokatalys; organokatalysator; organisk syntes;

    Sammanfattning : Photoredox catalysis applications for the purpose of new synthetic routes in organic and sustainable chemistry are hot topics in organic synthesis today. In the present study, the synthesis of a chiral proline-based organocatalyst functionalized with 10-phenyl-10H phenothiazine (PTH) photocatalytic moietiesis investigated and attempted for the first time. LÄS MER

  7. 20. Fitting the three loop pion mass and decay constant to lattice data

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

    Författare :Alexandra Wernersson; [2019]
    Nyckelord :Chiral Perturbation Theory; Lattice QCD; pion mass; decay constant; three loop fit.; Physics and Astronomy;

    Sammanfattning : We perform a fit to three loop order (NNNLO) in Chiral perturbation theory of the pion mass and decay constant. In particular we investigate if the NNNLO fit is an improvement of the fit to two loop order (NNLO) to lattice QCD data, which was done in a lattice gauge group collaboration. LÄS MER