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One peculiarity of massless particles is that they have to travel at the speed of light.
ECONOMIST: Cosmology
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Dr Koshiba's second detector showed that neutrinos, previously believed to be massless, actually have a small mass.
ECONOMIST: The 2002 Nobel prizes: Windows on the world | The
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If neutrinos were truly massless, the standard model would predict that their flavours would be fixed for ever.
ECONOMIST: Neutrinos
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If all particles in the universe were massless, then, the universe would look to them to be infinitely small.
ECONOMIST: Cosmology
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But that would be possible only if they had mass and the standard model says that, like photons (the particles of which light is composed), they should be massless.
ECONOMIST: The news that neutrinos have mass is both good and bad
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Without it, or something like it, some of the Standard Model's particles that actually do have mass (particularly the W and Z bosons) would be predicted to be massless.
ECONOMIST: The Higgs boson: Fantasy turned reality | The
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The consensus among physicists is that particles began massless and got their mass subsequently from something known as the Higgs field the search for which was one reason for building the Large Hadron Collider, a huge and powerful particle accelerator located near Geneva.
ECONOMIST: Cosmology