# The 38th International Symposium on Lattice Field Theory

Jul 26 – 30, 2021
US/Eastern timezone

## An update on QCD+QED simulations with C* boundary conditions

Jul 29, 2021, 6:45 AM
15m
Oral presentation Hadron Spectroscopy and Interactions

### Speaker

Jens Luecke (HU Berlin)

### Description

This talk is an update on the ongoing effort of the RC$^\star$ collaboration to generate fully dynamical QCD+QED configurations. We present the results of several ensembles with C$^\star$ boundary conditions that were generated using the openQ$^\star$D code. The simulations were tuned to the U-symmetric point ($m_d=m_s$) with pions at $m_{\pi^{\pm}} \approx 400$ MeV and a splitting of $m_{K^0}-m_{K^{\pm}} \approx 20$ MeV. In order to amplify the isospin breaking effects an artificially large value for the renormalized electromagnetic coupling $\alpha_R \approx 0.04$ was chosen. A novelty in the analysis is the inclusion of the sign of the Pfaffian and a reweighting in the mass. Also, the stability of the algorithm, diagnostic observables and neutral and charged meson masses will be discussed. Furthermore, the line of constant physics and the chosen tuning strategy will be shortly presented.

### Primary authors

Jens Luecke (HU Berlin) Isabel Campos Plasencia (Consejo Superior de Investigaciones Cientificas (CSIC) (ES)) Prof. Marina Krstic Marinkovic (ETH Zurich) Agostino Patella (Humboldt-Universität zu Berlin) Prof. Nazario Tantalo (University of Rome "Tor Vergata")

### Presentation materials

 An update on QCD+QED simulations with C* boundary conditions LATTICE2021_JensLuecke.pdf