On Fri, Mar 16, 2012 at 11:44 PM, Javier Herrero <[email protected]> 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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
