2014/01/30 by Susana Coito, Coito, Susana · 1 citation
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.1401.7856
PhD Thesis, approved on 19th December 2013, 107 pages, 22 figures, 22 tables, book latex style
arxiv created 2014/01/30 · openalex publication_date 2014/01/30 · arxiv updated 2014/01/31 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Quantum chromodynamics (QCD), the quantum field theory of strong interactions, is highly nonpertubative in the low-energy sector, where confinement dominates and resonance phenomena are observed. Therefore, phenomenological unquenched models based on the old ideas of the S-matrix theory give a fundamental contribution to understand the complex pattern of masses, widths and shapes of experimentally observed meson resonances. In the present thesis we employ the Resonance-Spectrum-Expansion coupled-channel model to study two enigmatic meson states, the isoscalar vector ϕ(2170) and the charmonium-like axial-vector X(3872). The same model is applied to describe the peculiar pattern of masses and widths of the open-charm axial-vectors - pseudovectors D1(2420) and D1(2430), and Ds1(2460) and Ds1(2536). Furthermore, a simplified Schrödinger model is used to study the dominant wave-function components of X(3872) near its resonance mass. Both models successfully describe the whole variety of special features observed in experiment, which are not so easily explained in QCD-inspired quenched models.