Javier, What you describe in your email is basically correct. You can see the slides from the three talks via the website:
http://neu2012.kek.jp/ Choose the Indico link at the very bottom of the page. Then, you need to login with a username and password, but they are both given to you in the same box that asks for them. Please let me know if you have problems accessing the slides. I have learned a lot about timing since the OPERA result was first announced. However, it is quite clear than special relativity is intact, although I expect that several experiments will now continue to push the systematic errors down to the ~1 ns level. Best regards, Marvin On Jun 8, 2012, at 2:49 AM, Javier Serrano wrote: > On Fri, Jun 8, 2012 at 1:51 AM, Marvin Marshak <[email protected]> wrote: >> Good morning from Japan, >> >> The Neutrino 2012 Conference is being held in Kyoto, Japan, this week. This >> morning's session is scheduled for 3 talks on neutrino velocity--one from >> the OPERA Experiment that initially reported the anomalous effect, one >> discussing other experiments at the Italian Gran Sasso Lab and a third talk >> from the MINOS Experiment (Fermilab to Soudan MN). The session will begin at >> 0915 Japan time. >> > > Hi Marvin, > > Someone told me the LNGS experiments reported just preliminary results > (some more fine-tuning of calibrations needed) with central values of > Dt ranging from 2 to 6 ns with statistical errors around 1 ns and > systematics ranging from 3 to 6 ns (positive Dt means nu slower than > light). Apparently MINOS presented only a reanalysis of the data > accumulated from 2005 with Dt around -11 ns and a systematic error of > the order of 15 ns. The analysis of more recent data collected after > installation of the new timing system will probably be available > after the Summer. Is this correct? > > BTW, we installed White Rabbit links redundantly to the existing LNGS > and CERN timing systems for the two weeks of special beam > (100ns-spaced 2ns-wide bunches). It was quite a rush so it is not > fully documented. All the data we gathered can be seen at > https://project-lngstt.web.cern.ch/project-lngstt/ (although it is > quite useless without explanations of what the data actually mean). > The important bit is that WR agreed with the legacy systems at least > at CERN, OPERA and Icarus. Borexino and LVD have not checked yet > against WR, but should do so in the near future. > > So in terms of redundancy we have: > - Four different experiments in LNGS basically agreeing on the value > of the neutrino speed, compatible with c. > - Two different timing technologies (for internal lab distribution) > agreeing at CERN and two different timing technologies agreeing in > LNGS. > - Two different GPS time transfer systems using two different software > analysis tools agreeing with each other. > > The only bit of redundancy I see missing is in certain parts of CERN, > like the length of the cable from the Beam Current Transformer to the > digitizer, which is common mode to everybody. The MINOS data, when it > becomes available should provide more reassurance on those last bits. > > 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. Marvin L. Marshak College of Science and Engineering Professor Morse-Alumni Professor University of Minnesota 116 Church Street SE Minneapolis MN 55455 612-624-1312 612-624-4578 (fax) _______________________________________________ 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.
