CERN OPERA’s FTL neutrinos are rejected by CERN ICARUS scientists

OPERA is one set of experiments at CERN’s Italian partner labs at Gran Sasso and ICARUS is another.

In September Opera reported the FTL neutrinos to widespread scepticism, wonder and some delight. Last Friday the OPERA scientists reported that new experiments supported the September results.

But on Saturday the ICARUS scientists reported – also on the same website-  that they had analysed the September results and that they do not stand up!!!

A search for the analogue to Cherenkov radiation by high energy neutrinos at superluminal speeds in ICARUS

Reuters reports:

An international team of scientists in Italy studying the same neutrino particles colleagues say appear to have travelled faster than light rejected the startling finding this weekend, saying their tests had shown it must be wrong.

The first team, members of the OPERA experiment at the Gran Sasso laboratory south of Rome, said they recorded neutrinos beamed to them from the CERN research centre in Switzerland as arriving 60 nanoseconds before light would have done.

But ICARUS, another experiment at Gran Sasso — which is deep under mountains and run by Italy’s National Institute of National Physics — now argues that their measurements of the neutrinos energy on arrival contradict that reading.

In a paper posted on Saturday on the same website as the OPERA results,, the ICARUS team says their findings “refute a superluminal (faster than light) interpretation of the OPERA result.”

They argue, on the basis of recently published studies by two top U.S. physicists, that the neutrinos pumped down from CERN, near Geneva, should have lost most of their energy if they had travelled at even a tiny fraction faster than light.

But in fact, the ICARUS scientists say, the neutrino beam as tested in their equipment registered an energy spectrum fully corresponding with what it should be for particles travelling at the speed of light and no more.

Physicist Tomasso Dorigo, who works at CERN, the European Organisation for Nuclear Research, and the U.S. Fermilab near Chicago, said in a post on the website Scientific Blogging that the ICARUS paper was “very simple and definitive.” ….. 

There was widespread scepticism when the OPERA findings were first revealed, and even the leaders of the experiment insisted that they were not announcing a discovery but simply recording measurements they had made and carefully checked. However, last Friday they said a new experiment with shorter neutrino beams from CERN and much larger gaps between them had produced the same result. Independent scientists said however this was not conclusive.

Other experiments are being prepared — at Fermilab and at the KEK laboratory in Japan — to try to replicate OPERA’s findings. Only confirmation from one of these would open the way for a full scientific discovery to be declared.

Good healthy scientific discourse it might seem — or is it possibly the age old tactic for securing funds. Announce an amazing discovery, then deny it (maybe) , then ask for more funds to study the matter.

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2 Responses to “CERN OPERA’s FTL neutrinos are rejected by CERN ICARUS scientists”

  1. Vivek .E. Says:

    what is the use of this experiment, if opera readings are confirmed?

  2. roberto Says:

    hi VIVEK
    A experiment ,with good practice,CAN´T leave to TWO readings and results opposites.
    best regards

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