Coupled-channel Dπ, Dη and Ds(K)over-bar scattering from lattice QCD

被引：0
|
作者：
Moir, Graham [1 ]
Peardon, Michael [2 ]
Ryan, Sinead M. [2 ]
Thomas, Christopher E. [1 ]
Wilson, David J. [1 ]
机构：
[1] Univ Cambridge, Dept Appl Math & Theoret Phys, Ctr Math Sci, Wilberforce Rd, Cambridge CB3 0WA, England
[2] Trinity Coll Dublin, Sch Math, Dublin 2, Ireland
来源：
JOURNAL OF HIGH ENERGY PHYSICS | 2016年 / 10期
基金：
爱尔兰科学基金会; 英国科学技术设施理事会;
关键词：
Lattice field theory simulation; QCD Phenomenology; STATES; MESONS;
D O I：
10.1007/JHEP10(2016)011
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We present the first lattice QCD study of coupled-channel D pi, D eta and Ds (K) over bar scattering in isospin-1/2 in three partial waves. Using distillation, we compute matrices of correlation functions with bases of operators capable of resolving both meson and meson-meson contributions to the spectrum. These correlation matrices are analysed using a variational approach to extract the finite-volume energy eigenstates. Utilising Luscher's method and its extensions, we constrain scattering amplitudes in S, P and D-wave as a function of energy. By analytically continuing the scattering amplitudes to complex energies, we investigate the S-matrix singularities. Working at m(pi) approximate to 391 MeV, we find a pole corresponding to a J(P) = 0(+) near-threshold bound state with a large coupling to D pi. We also find a deeply bound J(P) = 1(-) state, and evidence for a J(P) = 2(+) narrow resonance coupled predominantly to D pi. Elastic D pi scattering in the isospin-3/2 channel is studied and we find a weakly repulsive interaction in S-wave.
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页数：37
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