Axial-Vector D1 Hadrons in D*π Scattering from QCD
Abstract
We present I =1 /2 D*π scattering amplitudes from lattice QCD and determine two low-lying JP=1+ axial-vector D1 states and a JP=2+ tensor D2*. Computing finite-volume spectra at a light-quark mass corresponding to mπ≈391 MeV , for the first time, we are able to constrain coupled JP=1+ D*π amplitudes with 2S + 1ℓJ = 3S1 and 3D1 as well as coupled JP=2+ D π (1D2) and D*π (3D2>) amplitudes via Lüscher's quantization condition. Analyzing the scattering amplitudes for poles we find a near-threshold bound state, producing a broad feature in D*π {3S1} . A narrow bump occurs in D*π {3D1} due to a D1 resonance. A single resonance is found in JP=2+ coupled to D π and D*π . A relatively low mass and large coupling are found for the lightest D1, suggestive of a state that will evolve into a broad resonance as the light-quark mass is reduced. An earlier calculation of the scalar D0* using the same light-quark mass enables comparisons to the heavy-quark limit.
- Publication:
-
Physical Review Letters
- Pub Date:
- December 2022
- DOI:
- 10.1103/PhysRevLett.129.252001
- arXiv:
- arXiv:2205.05026
- Bibcode:
- 2022PhRvL.129y2001L
- Keywords:
-
- High Energy Physics - Phenomenology;
- High Energy Physics - Lattice
- E-Print:
- 7+6 pages, 3+3 figures