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Lattice determination of Sigma-Lambda mixing

Research output: Contribution to journalArticlepeer-review

  • R. Horsley
  • J. Najjar
  • Y. Nakamura
  • H. Perlt
  • D. Pleiter
  • P. E. L. Rakow
  • G. Schierholz
  • A. Schiller
  • H. Stueben
  • J. M. Zanotti
  • QCDSF-UKQCD Collaboration

Related Edinburgh Organisations

Original languageEnglish
Article number074512
Number of pages22
JournalPhysical Review D
Issue number7
Publication statusPublished - 14 Apr 2015


Isospin breaking effects in baryon octet (and decuplet) masses are due to a combination of up and down quark mass differences and electromagnetic effects and lead to small mass splittings. Between the Sigma and Lambda this mass splitting is much larger, this being mostly due to their different wave functions. However when isospin is broken, there is a mixing between these states. We describe the formalism necessary to determine the QCD mixing matrix and hence find the mixing angle and mass splitting between the Sigma and Lambda particles due to QCD effects.

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