Kaon bag parameter BK at the physical mass point

Budapest-Marseille-Wuppertal Collaboration

Research output: Contribution to journalConference articlepeer-review


A summary of the recent determination of the kaon bag parameter BK by the Budapest-Marseille-Wuppertal collaboration is given. We use a subset of our new 2+1 flavor ensembles with tree-level Symanzik glue and 2-step HEX-smeared clover fermions, featuring pion masses between 120 MeV and 380 MeV, a total of 4 lattice spacings (at 2 of which the physical mass point is reached) and large volumes (up to 6 fm). We use the RI/MOM scheme with trace subtraction to renormalize the data non-perturbatively. We find BRI K (3.5 GeV) = 0.5308(56)(23) at the physical mass point, in the continuum and in infinite volume, with all systematics accounted for. Finally, the details of the conversion to RGI and MS conventions are discussed.

Original languageEnglish (US)
JournalProceedings of Science
StatePublished - 2011
Event29th International Symposium on Lattice Field Theory, Lattice 2011 - Squaw Valley, Lake Tahoe, United States
Duration: Jul 10 2011Jul 16 2011

All Science Journal Classification (ASJC) codes

  • General


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