Conveners
Meson Spectrum in Meson-Scattering Processes
- Astrid Hiller Blin (Johannes Gutenberg Universität Mainz)
Description
co-host: Susan Shadmand
For the first time using lattice QCD we determine an exotic $1^{-+}$ hybrid meson appearing as a resonance in coupled-channel scattering. The calculation, performed with an exact SU(3) flavor symmetry, suggests that the hybrid has a large coupling to at least one axial-vector—pseudoscalar channel. A simple extrapolation to the physical light quark mass suggests a broad $\pi_1$ decaying...
I will discuss some recent first-principles lattice QCD calculations of $DK$ and $D\bar{K}$ scattering, relevant for the enigmatic $D_{s0}(2317)$, with light-quark masses corresponding to $m_\pi = 239$ MeV and $m_\pi = 391$ MeV. The S-waves contain interesting features including a near-threshold $J^P = 0^+$ bound state in isospin-0 $DK$, corresponding to the $D_{s0}(2317)$, with an effect that...
For the first time, we find a complex $D_0^\star$ resonance pole in elastic Isospin-1/2 $D\pi$ scattering, using Lattice QCD with a pion mass $m_\pi\approx239$ MeV and the Lüscher finite-volume quantisation condition. The resonance, which is lighter than the $D_{s0}^\star$ found on the same lattice, is strongly coupled to the $S$-wave $D\pi$ channel. We find that both $q\bar{q}$-like and...
The situation regarding the lightest strange resonance, the $\kappa/K_0^*(700)$ has been long debated for the last few decades, and although its existence is nowadays widely accepted, the data driven determination of its parameters is not so well known. In this talk we present a precise and model-independent determination of its pole parameters, therefore proving its existence. We use both...
The feasibility of describing the LHCb J/psi-N pentaquark and DK states in terms of triangle production and final state interactions is assessed. We find that reasonable descriptions of both sets of states is possible, but that there is substantial model ambiguity, making it difficult to assign definitive interpretations to these signals, absent additional information.
