# XIIIth Quark Confinement and the Hadron Spectrum

31 July 2018 to 6 August 2018
Maynooth University
Europe/Dublin timezone

## Charmonium resonances from 2+1 flavor CLS lattices

2 Aug 2018, 17:00
20m
Hall H (Arts Bldg.)

### Hall H

#### Arts Bldg.

Talk C: Heavy quarks

### Speaker

Daniel Mohler (Helmholtz-Institut Mainz)

### Description

Properties of resonances and excited states near decay thresholds are encoded
in hadronic scattering amplitudes, which can be extracted from the finite volume
spectrum using (extensions of) Lueschers method. We discuss how to reliably
extract the finite volume spectrum above strong-interaction decay thresholds
from lattice QCD simulations. Preliminary results for such spectra in
various frames and lattice irreducible representations on some of the coarser
CLS gauge field ensembles with a pion mass of roughly 280 MeV are presented. The current
results focus on two particular sets of charmonium quantum numbers $J^{PC}$:
For $J^{PC}=1^{--}$ the $\Psi(3770)$ resonance is considered as a benchmark
for our methods, while we attempt to predict the more interesting resonance spectrum with
$J^{PC}=0^{++}$. For $J^{PC}=0^{++}$ Belle sees a candidate for the
$\chi_{c0}^\prime$ and the $X(3915)$ seen in the $J/psi\omega$ channel has
previously been argued to have these quantum numbers. The future aim of our
investigation is to further extend the scope of these calculations with the long-term goal
of understanding the properties of the X(Y,Z) states that do not fit into the conventional models of quark-antiquark mesons.

### Primary authors

Daniel Mohler (Helmholtz-Institut Mainz) Sara Collins (University of Regensburg) Padmanath Madanagopalan (Universitaet Regensburg) Stefano Piemonte (Universitaet Regensburg) Gunnar Bali (Universität Regensburg) Simon Weishaeupl (Universitaet Regensburg)