The kaon semileptonic form factor with near physical domain wall quarks

  • RBC/UKQCD collaboration
  • P. A. Boyle
  • J. M. Flynn
  • N. Garron
  • A. JüttnerEmail author
  • C. T. Sachrajda
  • K. Sivalingam
  • J. M. Zanotti


We present a new calculation of the K → π semileptonic form factor at zero momentum transfer in domain wall lattice QCD with N f = 2+1 dynamical quark flavours. By using partially twisted boundary conditions we simulate directly at the phenomenologically relevant point of zero momentum transfer. We perform a joint analysis for all available ensembles which include three different lattice spacings (a = 0.09 – 0.14 fm), large physical volumes (m π L > 3.9) and pion masses as low as 171 MeV. The comprehensive set of simulation points allows for a detailed study of systematic effects leading to the prediction \( f_{+}^{{K\pi }}(0)=0.9670\left( {20} \right)\left( {_{-46}^{+18 }} \right) \), where the first error is statistical and the second error systematic. The result allows us to extract the CKM-matrix element \( \left| {{V_{us }}} \right|=0.2237\left( {_{-8}^{+13 }} \right) \) and confirm first-row CKM-unitarity in the Standard Model at the sub per mille level.


Lattice QCD Quark Masses and SM Parameters Kaon Physics Standard Model 


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Copyright information

© SISSA, Trieste, Italy 2013

Authors and Affiliations

  • RBC/UKQCD collaboration
  • P. A. Boyle
    • 1
  • J. M. Flynn
    • 2
  • N. Garron
    • 3
  • A. Jüttner
    • 2
    Email author
  • C. T. Sachrajda
    • 2
  • K. Sivalingam
    • 1
  • J. M. Zanotti
    • 4
  1. 1.School of Physics & AstronomyUniversity of EdinburghEdinburghU.K.
  2. 2.School of Physics & AstronomyUniversity of SouthamptonSouthhamptonU.K.
  3. 3.School of MathematicsTrinity CollegeDublin 2Ireland
  4. 4.CSSM, School of Chemistry and PhysicsUniversity of AdelaideAdelaideAustralia

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