Assertion: neutrino | /r/HasAspect | mass
Facets:
value: by trying to observe neutrino oscillations
type: MANNER
Source sentences:
text: Studies of neutrinos produced in the interactions of cosmic rays in Earth’s atmosphere also indicate that neutrinos have mass, but further experiments are needed to understand the exact masses involved.
text: Nevertheless, as neutrinos have mass, their helicity is frame-dependent, so it is the related frame-independent property of chirality that is relevant here.
text: According to the theory of special relativity, the question of neutrino velocity is closely related to their mass: If neutrinos are massless, they must travel at the speed of light, and if they have mass they cannot reach the speed of light.
text: The Nobel prize in Physics 2015 was awarded to both Takaaki Kajita and Arthur B. McDonald for their experimental discovery of neutrino oscillations, which demonstrates that neutrinos have mass.
text: While this shows that neutrinos have mass, the absolute neutrino mass scale is still not known.
text: Certain neutrino-less decay modes are kinematically allowed but are, for all practical purposes, forbidden in the Standard Model, even given that neutrinos have mass and oscillate.
text: Recent analysis of neutrinos emanated by the Sun has suggested that each type of neutrino can spontaneously turn into one of the others in a process of neutrino oscillation, and for theoretical reasons this in turn would require that neutrinos have mass.
text: There is no direct evidence that neutrinos have mass.
text: However, it may be possible to infer that neutrinos have mass through the observation of neutrino oscillations, a quantum mechanical effect that can be observed only if each neutrino species has a different mass.
text: The quantum mechanical effect called neutrino oscillations provides one method—if neutrinos have mass.
text: If so, it could explain the solar neutrino problem and would show that the neutrinos have mass.
text: Recent analysis of neutrinos emanated by the Sun has suggested that each type of neutrino can spontaneously turn into one of the others in a process of neutrino oscillation, and for theoretical reasons this in turn would require that neutrinos have mass.
text: Scientists are eager to learn whether neutrinos have mass, a result that would put a crack in the Standard Model, leading to major changes in our picture of the evolution of the universe.
text: If neutrinos have mass, even if only a little, then because there are so many of them they would weigh more than all the stars in the Universe.
text: The MINOS experiment will use the NuMI neutrino beam at Fermilab to search for this phenomenon as a way to answer the question whether neutrinos have mass.
text: Fermilab's MINOS (Main Injector Neutrino Oscillation Search) experiment will attempt to discover if neutrinos have mass by trying to observe neutrino oscillations, or changes in "flavors," among the three types of neutrino.
text: As early as the late 1950s, physicists suggested that neutrinos could have mass, and, if they do, would be able to transform from one flavor to another.
text: However if neutrinos have mass and can change flavor, for example, if muon neutrinos can change into electron neutrinos and vice versa, then only L is conserved .
text: The discovery of neutrino oscillation implies that neutrinos have mass, so the photon is the only known massless particle.
text: Of course, more recent experiments have detected neutrino oscillation, which tells us that neutrinos don't move at the speed of light and do have masses.