Scalar and Tensor Charmonium Resonances in Coupled-Channel Scattering from Lattice QCD.
Phys Rev Lett
; 132(24): 241901, 2024 Jun 14.
Article
en En
| MEDLINE
| ID: mdl-38949338
ABSTRACT
We determine J^{PC}=0^{++} and 2^{++} hadron-hadron scattering amplitudes in the charmonium energy region up to 4100 MeV using lattice QCD, a first-principles approach to QCD. Working at m_{π}≈391 MeV, more than 200 finite-volume energy levels are computed and these are used in extensions of the Lüscher formalism to determine infinite-volume coupled-channel scattering amplitudes. We find that this energy region contains a single χ_{c0} and a single χ_{c2} resonance. Both are found as pole singularities on the closest unphysical Riemann sheet, just below 4000 MeV with widths around 70 MeV. The largest couplings are to kinematically closed D^{*}D[over ¯]^{*} channels in S-wave, and couplings to several decay channels consisting of pairs of open-charm mesons are found to be large and significant in both cases. Above the ground state χ_{c0}, no other scalar bound states or near-DD[over ¯] threshold resonances are found, in contrast to several theoretical and experimental studies.
Texto completo:
1
Banco de datos:
MEDLINE
Idioma:
En
Año:
2024
Tipo del documento:
Article