String breaking by light and strange quarks in QCD

Abstract

The energy spectrum of a system containing a static quark anti-quark pair is computed for a wide range of source separations using lattice QCD with $N_{\mathrm{f}}=2+1$ dynamical flavours. By employing a variational method with a basis including operators resembling both the gluon string and systems of two separated static mesons, the first three energy levels are determined up to and beyond the distance where it is energetically favourable for the vacuum to screen the static sources through light- or strange-quark pair creation, enabling both these screening phenomena to be observed. The separation dependence of the energy spectrum is reliably parameterised over this saturation region with a simple model which can be used as input for subsequent investigations of quarkonia above threshold and heavy-light and heavy-strange coupled-channel meson scattering.

12 pages, 3 figures; version accepted for publication in Physics Letters B

References in corpus (3)

• On the generalized eigenvalue method for energies and matrix elements in lattice field theory
• A novel quark-field creation operator construction for hadronic physics in lattice QCD
• Simulation of QCD with N_f=2+1 flavors of non-perturbatively improved Wilson fermions

Cited by in corpus (7)

• Bottomonium resonances with $I=0$ from lattice QCD correlation functions with static and light quarks
• Color Screening in Quantum Chromodynamics
• Diabatic description of bottomoniumlike mesons
• Diabatic description of charmoniumlike mesons II: mass corrections and strong decay widths
• The unreasonable effectiveness of effective string theory: the case of the 3d SU(2) Higgs model
• Is ${\chi }_{c1}(3872)$ generated from string breaking?
• Coupled-channel meson-meson scattering in the diabatic framework