An accurate optical lattice clock with 87Sr atoms
  We report a frequency measurement of the 1S0-3P0 transition of 87Sr atoms in an optical lattice clock. The frequency is determined to be 429 228 004 229 879 (5) Hz with a fractional uncertainty that is comparable to state-of-the-art optical clocks with neutral atoms in free fall. Two previous measurements of this transition were found to disagree by about 2x10^{-13}, i.e. almost four times the combined error bar, instilling doubt on the potential of optical lattice clocks to perform at a high accuracy level. In perfect agreement with one of these two values, our measurement essentially dissipates this doubt. 
Rodolphe Le Targat (SYRTE), Xavier Baillard (SYRTE), Mathilde Fouch\'e   (SYRTE), Anders Brusch (SYRTE), Olivier Tcherbakoff...