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Neutrinos sent from CERN to Gran Sasso respect the cosmic speed limit, experiments confirm

Date:
June 8, 2012
Source:
CERN, the European Organization for Nuclear Research
Summary:
The latest results on the time of flight of neutrinos from CERN to the INFN Gran Sasso Laboratory have just been presented. Four experiments -- Borexino, ICARUS, LVD and OPERA -- all measure a neutrino time of flight consistent with the speed of light. This is at odds with a measurement that the OPERA collaboration put up for scrutiny last September, indicating that the original OPERA measurement can be attributed to a faulty element of the experiment's fibre optic timing system.
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At the 25th International Conference on Neutrino Physics and Astrophysics in Kyoto today (June 8, 2012), CERN Research Director Sergio Bertolucci presented results on the time of flight of neutrinos from CERN to the INFN Gran Sasso Laboratory on behalf of four experiments situated at Gran Sasso. The four, Borexino, ICARUS, LVD and OPERA all measure a neutrino time of flight consistent with the speed of light.

This is at odds with a measurement that the OPERA collaboration put up for scrutiny last September, indicating that the original OPERA measurement can be attributed to a faulty element of the experiment’s fibre optic timing system.

“Although this result isn’t as exciting as some would have liked,” said Bertolucci, “it is what we all expected deep down. The story captured the public imagination, and has given people the opportunity to see the scientific method in action – an unexpected result was put up for scrutiny, thoroughly investigated and resolved in part thanks to collaboration between normally competing experiments. That’s how science moves forward.”

In another development reported in Kyoto, the OPERA experiment showed evidence for the appearance of a second tau-neutrino in the CERN muon-neutrino beam, this is an important step towards understanding the science of neutrino oscillations.

 


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The above post is reprinted from materials provided by CERN, the European Organization for Nuclear Research. Note: Materials may be edited for content and length.


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CERN, the European Organization for Nuclear Research. "Neutrinos sent from CERN to Gran Sasso respect the cosmic speed limit, experiments confirm." ScienceDaily. ScienceDaily, 8 June 2012. <www.sciencedaily.com/releases/2012/06/120608152339.htm>.
CERN, the European Organization for Nuclear Research. (2012, June 8). Neutrinos sent from CERN to Gran Sasso respect the cosmic speed limit, experiments confirm. ScienceDaily. Retrieved June 30, 2015 from www.sciencedaily.com/releases/2012/06/120608152339.htm
CERN, the European Organization for Nuclear Research. "Neutrinos sent from CERN to Gran Sasso respect the cosmic speed limit, experiments confirm." ScienceDaily. www.sciencedaily.com/releases/2012/06/120608152339.htm (accessed June 30, 2015).

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