| Autor: |
Gayer, Luke, Lang, Nicolas, Ryan, Sinéad, Tims, David, Thomas, Christopher, Wilson, David |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Zdroj: |
Journal of High Energy Physics |
| Popis: |
Isospin-1/2 Dπ scattering amplitudes are computed using lattice QCD, working in a single volume of approximately (3.6 fm)3 and with a light quark mass corresponding to m π ≈ 239 MeV. The spectrum of the elastic Dπ energy region is computed yielding 20 energy levels. Using the Lüscher finite-volume quantisation condition, these energies are translated into constraints on the infinite-volume scattering amplitudes and hence enable us to map out the energy dependence of elastic Dπ scattering. By analytically continuing a range of scattering amplitudes, a D 0 ∗ $$ {D}_0^{\ast } $$ resonance pole is consistently found strongly coupled to the S-wave Dπ channel, with a mass m ≈ 2200 MeV and a width Γ ≈ 400 MeV. Combined with earlier work investigating the D s 0 ∗ $$ {D}_{s0}^{\ast } $$ , and D 0 ∗ $$ {D}_0^{\ast } $$ with heavier light quarks, similar couplings between each of these scalar states and their relevant meson-meson scattering channels are determined. The mass of the D 0 ∗ $$ {D}_0^{\ast } $$ is consistently found well below that of the D s 0 ∗ $$ {D}_{s0}^{\ast } $$ , in contrast to the currently reported experimental result. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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