期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 7, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP07(2021)123
关键词
Lattice QCD; Lattice Quantum Field Theory
资金
- Royal Society University Research Fellowship
- Irish Research Council Government of Ireland Postgraduate Scholarship
- U.K. Science and Technology Facilities Council (STFC) [ST/T000694/1]
- STFC
- Rolls Royce
- Mitsubishi Heavy Industries
- ALCC award
- Oak Ridge National Laboratory - Office of Science of the U.S. Department of Energy [DE-AC05-00OR22725]
- National Science Foundation [OCI-0725070, ACI-1238993]
- state of Illinois
- Office of Science of the U.S. Department of Energy [DEAC02-05CH11231]
- U.S. Department of Energy INCITE program at Oak Ridge National Lab, NERSC
- NSF Teragrid at the Texas Advanced Computer Center
- Pittsburgh Supercomputer Center
- Jefferson Lab
The scattering amplitudes of isospin-1/2 D pi are computed using lattice QCD, revealing a D-0* resonance pole strongly coupled to the S-wave D pi channel. This resonant state has a mass of approximately 2200 MeV and a width of around 400 MeV, consistently found below the mass of the D-s0*.
Isospin-1/2 D pi 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(pi) approximate to 239 MeV. The spectrum of the elastic D pi energy region is computed yielding 20 energy levels. Using the Luscher 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 D pi scattering. By analytically continuing a range of scattering amplitudes, a D-0* resonance pole is consistently found strongly coupled to the S-wave D pi channel, with a mass m approximate to 2200 MeV and a width Gamma approximate to 400 MeV. Combined with earlier work investigating the D-s0*, 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-s0*, in contrast to the currently reported experimental result.
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