Speaker
C. B. Lang
(Univ. Graz)
Description
We study the three D_s quantum channels J^P = 0^+, 1^+ and 2^+ where experiments have identified the charm-strange states D*_s0 (2317), D_s1(2460), D_s1(2536) near the DK and D*K thresholds, and D*_s2(2573). We consider correlation functions for sets of qbar q operators and, for J^P = 0^+, 1^+, also the DK and D*K meson-meson interpolators and determine for these cases values of the elastic scattering amplitude. Constructing the full set of correlators requires propagators which connect any pair of lattice sites. For one ensemble of gauge configurations (32^3 x 64, m_pi= 156 MeV) a stochastic distillation variant is employed and for another ensemble (16^3 x 32, m_pi= 266 MeV) we use the full distillation method. Both, D*_s0(2317) and D_s1(2460), are found as bound states below threshold, whereas D_s1(2536), and D*_s2(2573) are identified as narrow resonances close to the experimental masses.
Primary author
C. B. Lang
(Univ. Graz)
Co-authors
Dr
Daniel Mohler
(Fermilab)
Mr
Luka Leskovec
(Institute Jozef Stefan)
Prof.
Sasa Prelovsek
(University of Ljubljana)
Prof.
Woloshyn R. M.
(TRIUMF)
