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Posts Tagged ‘neutrino

A new neutrino oscillation

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Starting in the late 1960s, neutrino detectors began to see signs that neutrinos, now known to come in the flavors electron (νe), muon (νμ), and tau (ντ), could transform from one flavor to another. The findings implied that neutrinos must have mass, since massless particles travel at the speed of light and their clocks, so to speak, don’t tick, thus they cannot change…..

Read more: http://physics.aps.org/articles/v4/57

Written by physicsgg

July 19, 2011 at 9:28 am

Posted in High Energy Physics

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The antineutrino vanishes differently

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CPT symmetry, the combination of charge conjugation, parity inversion, and time reversal, is a fundamental symmetry of particle and nuclear physics and is considered sacred. It is conserved in field theories that explain the strong, weak, and electromagnetic interactions. In the lepton sector, CPT symmetry requires that muon neutrino disappearance oscillations be identical to muon antineutrino disappearance oscillations in vacuum. A test of CPT symmetry was recently performed by the MINOS experiment at Fermilab, which, due to its magnetic field, is the first experiment to distinguish μ- and μ+ tracks and separately measure the disappearance of muon neutrinos and muon antineutrinos [1]. (Previous experiments have measured a mixture of neutrino and antineutrino oscillations.) Remarkably, as reported in Physical Review Letters, MINOS appears to observe a difference between muon neutrino and muon antineutrino disappearance…..
Read more: http://physics.aps.org/articles/v4/54

Written by physicsgg

July 6, 2011 at 9:30 am