[time-nuts] Neutrinos not faster than light

Azelio Boriani azelio.boriani at screen.it
Sat Mar 17 14:21:49 UTC 2012


OK, thank you for the information.

On Sat, Mar 17, 2012 at 2:21 PM, Javier Serrano <
javier.serrano.pareja at gmail.com> wrote:

> On Fri, Mar 16, 2012 at 11:44 PM, Javier Herrero <jherrero at hvsistemas.es>
> wrote:
> > Hello,
> > Javier Serrano can confirm it for sure, but I think that the article with
> > the OPERA results is based on data from 2009 to 2011, not from data taken
> > the previous day :)
>
> Exactly.  OPERA first published a result based on several years of
> data taking prior to the summer 2011. These results were criticized on
> several fronts, most of which had to do with the 10us-wide proton
> distribution at the exit of CERN's Super Proton Synchrotron (SPS).
> Then it was decided to have a short run in December 2011 with
> 524ns-spaced proton bunches, so that neutrinos detected in Laboratori
> Nazionali del Gran Sasso (LNGS) could be unequivocally assigned to a
> single bunch. These bunches are around 1ns-wide. I think the four
> experiments in LNGS (OPERA, Icarus, Borexino and LVD) saw neutrino
> events during that run. For OPERA, these events confirmed their
> previous result, and they extended their original paper accordingly.
> This now is the publication of the Icarus results, based on 7 neutrino
> events. The time link between CERN's SPS and Icarus is different from
> the CERN-OPERA link only in the last stretch, where the dedicated
> OPERA and Icarus data-taking electronics reside. It's soon to conclude
> where the difference in results could come from. I personally don't
> know that last stretch well enough to comment. In any case, we will
> have another dedicated run with spaced bunches later in the Spring,
> and then all four experiments will be ready to publish a result quite
> quickly. In addition, our American friends in Fermilab and MINOS
> should be able to get a result as well some time in 2012. So we're
> entering now some very interesting months!
>
> Cheers,
>
> Javier
>
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