User talk:Anders Feder/OPERA neutrino anomaly

This article is a draft split of the Neutrino time-of-flight anomaly section from the OPERA experiment article. It needs some work.--Anders Feder (talk) 00:27, 8 October 2011 (UTC)

Details specific to the speed measurement should go into the 'Detection' section. Other details about the experiment should go into OPERA experiment.--Anders Feder (talk) 23:42, 7 October 2011 (UTC)

I think nobody responded to Contaldi's objection because it was based on not knowing the details of the experiment. The OPERA team doesn't use synchronized cesium clocks - they synchronize by looking at GPS signals from satellites visible from both locations. The rate of ticking of the cesium clock isn't Contaldi's objection - it is that at calibration the clocks must have drifted far apart because of GR effects. But the OPERA time transfer is not based on a calibration of synchronized (or almost-synchronized) clocks. Note that Contaldi published his paper at a time when the full details of the experiment were not public. Which leaves us with no sources to explicitly refute the Contaldi objection. 171.64.66.201 (talk) 01:34, 8 October 2011 (UTC)

Nature News: http://www.nature.com/news/2011/111005/full/news.2011.575.html Contaldi admits that his original analysis posted at arXiv wrongly assumed that OPERA's timings relied on a clock being moved from one end of the beam to the other. But even synchronizing the clocks using GPS does not remove the difference in the time dilation effect, which Contaldi says could amount to tens of nanoseconds. So the Contaldi paper is invalid. His new objection is not posted anywhere public I know of. Ajoykt (talk) 03:33, 8 October 2011 (UTC)