| Autor: |
Gayer, Luke, Lang, Nicolas, Ryan, Sinéad M., Tims, David, Thomas, Christopher E., Wilson, David J. |
| Předmět: |
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| Zdroj: |
Journal of High Energy Physics; Jul2021, Vol. 2021 Issue 7, p1-40, 40p |
| Abstrakt: |
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 mπ ≈ 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 ∗ 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 ∗ , and D 0 ∗ 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 ∗ is consistently found well below that of the D s 0 ∗ , in contrast to the currently reported experimental result. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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