B-meson semileptonic form factors on (2+1+1)-flavor HISQ ensembles

Fermilab Lattice and MILC Collaborations

Research output: Contribution to journalConference articlepeer-review


We report updates to an ongoing lattice-QCD calculation of the form factors for the semileptonic decays B → π`ν, Bs → K`ν, B → π`+`, and B → K`+`. The tree-level decays B(s) → π(K)`ν enable precise determinations of the CKM matrix element |Vub|, while the flavor-changing neutral-current interactions B → π(K)`+` are sensitive to contributions from new physics. This work uses MILC's (2+1+1)-flavor HISQ ensembles at approximate lattice spacings between 0.057 and 0.15 fm, with physical sea-quark masses on four out of the seven ensembles. The valence sector is comprised of a clover b quark (in the Fermilab interpretation) and HISQ light and s quarks. We present preliminary results for the form factors f0, f+, and fT, including studies of systematic errors.

Original languageEnglish (US)
Article number236
JournalProceedings of Science
StatePublished - 2019
Event37th International Symposium on Lattice Field Theory, LATTICE 2019 - Wuhan, China
Duration: Jun 16 2019Jun 22 2019

ASJC Scopus subject areas

  • General


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