massless particle

collocation in English

meaningsofparticle

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particle
noun
uk
/ˈpɑː.tɪ.kəl/us
/ˈpɑːr.t̬ə.kəl/
a word or a part of a word that has a grammatical purpose but often has little or ...
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(Definition ofparticlefrom theCambridge English Dictionary© Cambridge University Press)

Examplesofmassless particle

These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
With the discovery of neutrino oscillation, which implies that neutrinos have mass, the only observedmasslessparticleis the photon.
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For 0 one would get negative norm modes, as with everymasslessparticleof spin 1 or higher.
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Another way is to assign themasslessparticlea fictitious mass, and then take the limit as the fictitious mass vanishes.
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The spin of a particle may be used to define a handedness, or helicity, for that particle which, in the case of amasslessparticle, is the same as chirality.
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This is phenomenologically desirable because it leaves no massless particles, which are indeed not seen experimentally.
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The corresponding energy vanishes in the case of massless particles.
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All massless particles (particles whose invariant mass is zero) are elementary.
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By the very early sixties, people had begun to understand another source of massless particles: spontaneous symmetry breaking of a continuous symmetry.
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For massless particles the 3-point function can't be written as a polynomial series and (if it exists) may involve logarithms.
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As a classical field theory it has solutions which travel at the speed of light so that its quantum version should describe massless particles (gluons).
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In this view, light and other massless particles and fields are part of matter.
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Some correspond to massless particles like the photon; also in this group are a set of massless scalar particles.
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Photons are massless particles of definite energy, definite momentum, and definite spin.
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A second class of divergence, called an infrared divergence, is due to massless particles, like the photon.
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Since such mass is measured as part of ordinary "matter" in complex systems, the matter status of massless particles becomes unclear in such systems.
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It is the conversion of massless particles into one or more massive particles.
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Currently, the only known massless particles are gauge bosons: the photon (carrier of electromagnetism) and the gluon (carrier of the strong force).
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One consequence is that "c" is the speed at which all massless particles and waves, including light, must travel in vacuum.
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Parabolic transformations lead to the gauge symmetry of massless particles (like photons) with helicity 1.
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This approximation is not valid for massless particles since the expansion required the division of momentum by mass.
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These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
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