It Ain’t Over Till The Fat Lady Neutrina Sings Again
Posted by pwl on September 23, 2011
It ain’t over till the fat lady Neutrina sings again in a number of encore performances around the world, aka “extraordinary claims require extraordinary evidence” (to borrow a principle from Carl Sagan).
A quick summary of the alleged discovery of slightly faster than light neutrinos:
CERN’s Antonio Ereditato does a brief BBC Inteview.
“[The following] is the live Webcast from CERN on Friday September 23, 2011. Given the potential far-reaching consequences of the OPERA experiment — which observes a neutrino beam from CERN 730 km away at Italy’s INFN Gran Sasso Laboratory, indicating that the neutrinos travel at a velocity 20 parts per million above the speed of light — independent measurements are needed before the effect can either be refuted or firmly established, according to a CERN statement just issued. The OPERA collaboration has therefore decided to open the result to broader scrutiny.”
The full paper is available here:
“The OPERA neutrino experiment at the underground Gran Sasso Laboratory has measured the velocity of neutrinos from the CERN CNGS beam over a baseline of about 730 km with much higher accuracy than previous studies conducted with accelerator neutrinos. The measurement is based on high-statistics data taken by OPERA in the years 2009, 2010 and 2011. Dedicated upgrades of the CNGS timing system and of the OPERA detector, as well as a high precision geodesy campaign for the measurement of the neutrino baseline, allowed reaching comparable systematic and statistical accuracies. An early arrival time of CNGS muon neutrinos with respect to the one computed assuming the speed of light in vacuum of (60.7 \pm 6.9 (stat.) \pm 7.4 (sys.)) ns was measured. This anomaly corresponds to a relative difference of the muon neutrino velocity with respect to the speed of light (v-c)/c = (2.48 \pm 0.28 (stat.) \pm 0.30 (sys.)) \times 10-5. ”
Measurement of the neutrino velocity with the OPERA detector in the CNGS beam.
Some thoughts from physicists.