meh, Tachyon have been faster than light for a while now...
Name:
Anonymous2011-09-24 0:34
relativity?
Name:
Anonymous2011-10-03 19:32
Tachyons are a theoretical solution to an equation, and we have neither seen them nor do we have any way of seeing them.
Neutrinos are a light (low mass) particle with neutral electric charge. They interact via the weak interaction, and are ejected when a neutron decays into a proton, electron and electron anti-neutrino (and similar interactions).
The fact that they only interact via the weak interaction (low mass, no charge means neither gravity nor electric field affect them much) means they do not interact much with matter. In the experiment at CERN, they fired the neutrinos into the rock of the Earth's crust, and detected it at another site 700km away using a large detector.
The biggest question mark is over the timing measurement. The pulse of neutrinos itself was actually microseconds long, so the time-of-flight value is quite sensitive to the fitting method of the initial beam packet shape to the final beam packet.
Neutrinos were measured to be slightly faster (20 ppm) than light. Not enough to tear up the textbooks, but still significant.