4 research outputs found
Charmonia in moving frames
Lattice simulation of charmonium resonances with non-zero momentum provides
additional information on the two-meson scattering matrices. However, the
reduced rotational symmetry in a moving frame renders a number of states with
different in the same lattice irreducible representation. The
identification of for these states is particularly important, since
quarkonium spectra contain a number of states with different in a
relatively narrow energy region. Preliminary results concerning
spin-identification are presented in relation to our study of charmonium
resonances in flight on the Nf=2+1 CLS ensembles.Comment: 6 pages, presented at the 35th International Symposium on Lattice
Field Theory, 18-24 June 2017, Granada, Spai
Charmonium resonances on the lattice
The nature of resonances and excited states near decay thresholds is encoded
in scattering amplitudes, which can be extracted from single-particle and
multiparticle correlators in finite volumes. Lattice calculations have only
recently reached the precision required for a reliable study of such
correlators. The distillation method represents a significant improvement
insofar as it simplifies quark contractions and allows one to easily extend the
operator basis used to construct interpolators. We present preliminary results
on charmonium bound states and resonances on the Nf=2+1 CLS ensembles. The long
term goal of our investigation is to understand the properties of the X
resonances that do not fit into conventional models of quark-antiquark mesons.
We tune various parameters of the distillation method and the charm quark mass.
As a first result, we present the masses of the ground and excited states in
the 0++ and 1-- channels.Comment: 10 pages, 5 figures, talk and poster presented at the 35th
International Symposium on Lattice Field Theory, 18-24 June 2017, Granada,
Spai
Charmonia in moving frames
Lattice simulation of charmonium resonances with non-zero momentum provides additional information on the two-meson scattering matrices. However, the reduced rotational symmetry in a moving frame renders a number of states with different JP in the same lattice irreducible representation. The identification of JP for these states is particularly important, since quarkonium spectra contain a number of states with different JP in a relatively narrow energy region. Preliminary results concerning spin-identification are presented in relation to our study of charmonium resonances in flight on the Nf = 2 + 1 CLS ensembles