Edinburgh Research Explorer

Isospin splittings of meson and baryon masses from three-flavor lattice QCD + QED

Research output: Contribution to journalArticlepeer-review

  • R. Horsley
  • Y. Nakamura
  • H. Perlt
  • D. Pleiter
  • P. E. L. Rakow
  • G. Schierholz
  • A. Schiller
  • R. Stokes
  • H. Stüben
  • R. D. Young
  • J. M. Zanotti

Related Edinburgh Organisations

Open Access permissions


Original languageEnglish
JournalJournal of Physics G - Nuclear and Particle Physics
Issue number10
Publication statusPublished - 12 Sep 2016


Lattice QCD simulations are now reaching a precision where isospin breaking effects become important. Previously, we have developed a program to systematically investigate the pattern of flavor symmetry beaking within QCD and successfully applied it to meson and baryon masses involving up, down and strange quarks. In this Letter we extend the calculations to QCD + QED and present our first results on isospin splittings in the pseudoscalar meson and baryon octets. In particular, we obtain the nucleon mass difference of $M_n-M_p=1.35(18)(8)\,\mbox{MeV}$ and the electromagnetic contribution to the pion splitting $M_{\pi^+}-M_{\pi^0}=4.60(20)\,\mbox{MeV}$. Further we report first determination of the separation between strong and electromagnetic contributions in the $\bar{MS}$ scheme.

    Research areas

  • hep-lat, hep-ph, nucl-th

ID: 31831323