Skip to comments.Finding puts brakes on faster-than-light neutrinos
Posted on 10/21/2011 10:47:39 AM PDT by neverdem
An independent experiment confirms that subatomic particles have wrong energy spectrum for superluminal travel.
The claim that neutrinos can travel faster than light has been given a knock by an independent experiment.
On 17 October, the Imaging Cosmic and Rare Underground Signals (ICARUS) collaboration submitted a paper1 to the preprint server arXiv.org, in which it offered a rebuttal of claims2 to have clocked subatomic particles called neutrinos travelling faster than the speed of light. The original results were published on 22 September by the Oscillation Project with Emulsion-Tracking Apparatus (OPERA) experiment.
Both experiments are based at Gran Sasso National Laboratory near L'Aquila, Italy, and detect neutrinos coming in a beam from CERN, Europe's high-energy particle physics laboratory near Geneva in Switzerland, about 730 kilometres away. Unlike OPERA, ICARUS does not measure the neutrinos' speed directly. Instead, it has shown that the energy spectrum of the neutrinos does not exhibit an effect predicted last month3 by Andrew Cohen and Sheldon Glashow, theoretical physicists at Boston University in Massachusetts.
If the CohenGlashow effect is a valid prediction, "neutrinos are not superluminal," says Sandro Centro, a physicist at the University of Padua in Italy, deputy spokesman for ICARUS and a co-author of the latest paper.
Cohen says that an energy spectrum provided by OPERA showed the same inconsistency, and that the spectrum from ICARUS has added to the problem. "There's always value to having things checked independently," says Cohen. "I think it's great ICARUS has done this so quickly."
Too much momentum
The CohenGlashow effect is an extension of another phenomenon, well known to physicists. The speed of light travelling through materials such as water is lower than that in a vacuum, and charged particles such as electrons are able to exceed this lower speed when travelling through the medium. When they do...
(Excerpt) Read more at nature.com ...
ICARUS crashed when the fat lady sang at the OPERA.
You should be PUNished for that comment.
A neutrino walks into a bar.
I’m confused. I thought the science was settled.
Aiieee! It’s “traveling,” not “travelling.” Can’t physicists spell?
Physicists don’t do spells, It only looks like magic.
An aggressive litigation agency with a software house attached based in Redmond, WA decide “it’s ‘traveling’, not ‘travelling”,” but not all of us bow to Microsoft’s spell checker as the ultimate arbiter of English orthography. Many of us still defend the older convention, that used to apply almost universally on both sides of the Atlantic, that terminal letters are doubled when -ing or -ed is added in cases where the addition of an e would lengthen the vowel before the single consonant.
There are adequate testimonies to the use of travelling as the correct spelling for the present participle of the verb to travel, both online and in printed literature, that your complaint is completely invalid.
Both “traveling” and “travelling” are correct spellings. I believe Nature is a British periodical, and the later is actually the preferred spelling there.
2. 'Travelling' agrees with the double-consonant rule before 'ing'.
3. 'travelling': 178 million hits, 'traveling': 280 million. Same order of magnitude.
IQ 'can change in teenage years' BBC's version
FReepmail me if you want on or off my health and science ping list.
So, this experiment disagrees with another theoretical analysis. Why do they claim it disagrees with another experiment, it’s confusing.
Shoot! I had the neutrinos in my Phantasy Physics League this week.
I only wanted ONE THING.
And I am denied.
Here we go again ... Dueling Hypotheses at High Noon !!!
One guy claims to measure the speed of neutrinos traveling about 100 kilometers with accuracy resembling .00000001% of C. He then speculates that the results suggest they exceeded C by a significant, perhaps even meaningful amount which seems to overturn Physics As We Know It. Oh, my ! Whatever will we DO ?
Another guy comes along and points out that, while he wasn’t actually trying to clock the neutrinos ( within the same experimental regime ) he DID somehow manage to characterize them accurately enough ( as they went zipping by ) to speculate that they failed to adhere to the speculations of some OTHER guys — who weren’t even there — but STILL think they know what a superluminal neutrino MUST look and act like.
1st guy: Man, look at that superluminal neutrino’s ET ! He got here before he even left the Line ! All RIGHT !!!
2d guy: Man, that ain’t no superluminal neutrino — if he DID try to go that fast, my buddy over there thinks his wheels would fall off, at least !!!
1st guy: But ... but ... I got him clocked on the scoreboard over there ! I got him goin’ over the line in my camera, Dude !!!
2d guy: Sorry, man. Must have been some other dude’s ride ‘cause your guy’s wheels must have fallen off before you even clocked him.
And so it goes ...
One Man’s Opinion
Well they did another “better” test and STILL found FTL Neutrinos.
Ping Pong anyone.
Here is a Special Relativity Simulation: