Colin Macilwain replies

The opening paragraph of my story erred in stating that SLAC was “poised to win” its race with KEK to obtain significant measurements of charge-parity violation, but I stand by the rest of it, which accurately reflects the views of several scientists I interviewed at SLAC. The SLAC researchers believe themselves to be ahead at this early stage.

The director of KEK declined to be interviewed on this matter when I met him at SLAC on 21 January, but my colleague Robert Triendl obtained a response from Japan that confirmed my story's perspective, and was included in it.

Both of the quotes that I attributed to Dr Quinn in my story were accurate: her charges of distortion are not supported by the facts.