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Neutrinos travel faster than light
A neutrino ( pron.: / nj uː ˈ t r iː n oʊ / ; Italian pronunciation: [neuˈtriːno] ) is an electrically neutral, weakly interacting elementary subatomic particle [ 1 ] with half-integer spin . The neutrino (meaning "small neutral one" in Italian) is denoted by the Greek letter ν ( nu ). All evidence suggests that neutrinos have mass but that their mass is tiny even by the standards of subatomic particles. Their mass has never been measured accurately. Neutrinos do not carry electric charge , which means that they are not affected by the electromagnetic forces that act on charged particles such as electrons and protons. Neutrinos are affected only by the weak sub-atomic force , of much shorter range than electromagnetism, and gravity , which is relatively weak on the subatomic scale.
Read more: " Neutrinos: Complete guide to the ghostly particle " "…We don't allow faster-than-light neutrinos in here," says the barman. A neutrino walks into a bar…" As reports spread of subatomic particles moving faster than light and potentially travelling through time, such gags were born. But apparently super-hasty motion is not the only strange thing about neutrinos. What exactly are they?
Neutrino oscillation is a quantum mechanical phenomenon predicted by Bruno Pontecorvo [ 1 ] whereby a neutrino created with a specific lepton flavor ( electron , muon or tau ) can later be measured to have a different flavor. The probability of measuring a particular flavor for a neutrino varies periodically as it propagates. Neutrino oscillation is of theoretical and experimental interest since observation of the phenomenon implies that the neutrino has a non-zero mass, which is not part of the original Standard Model of particle physics . [ edit ] Observations A great deal of evidence for neutrino oscillation has been collected from many sources, over a wide range of neutrino energies and with many different detector technologies. [ 2 ] [ edit ] Solar neutrino oscillation
In May an international group of physicists studying the elusive particles known as neutrinos announced that they had spotted one spontaneously transforming from one type to another . Such an ability indicates that neutrinos, long thought to be weightless, have mass, a finding with profound theoretical and cosmological implications. Neutrinos come in three varieties: muon, tau, and electron.