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25:
367:
discovered in 2015 is also expected to be massless, but these are not actual particles. At one time neutrinos were thought to perhaps be Weyl fermions, but when they were discovered to have mass, that left no fundamental particles of the Weyl type.
355:, so the Standard Model neither predicts any such particle nor requires it, and no gravitational quantum particle has been indicated by experiment. Whether or not a graviton would be massless if it existed is likewise an open question.
381:, which are also quasiparticles. No real particle that is a Weyl fermion has been found to exist, and there is no compelling theoretical reason that requires them to exist.
377:– composite motions found in the structure of molecular latices that have particle-like behavior, but are not themselves real particles. Weyl fermions in matter are like
599:
395:
as they travel, at least two of the types of neutrinos must have mass (and cannot be Weyl fermions). The discovery of this phenomenon, known as
1714:
312:, which are known from experiment to be extremely massive. Of these, only the photon has been experimentally confirmed to be massless.
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563:"After 85 year search, massless particle with promise for next-generation electronics found"
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35:
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408:
82:
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420:
327:, and hence their presumed lack of rest mass cannot be confirmed by any feasible experiment.
613:
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465:
396:
694:
Day, Charles (2015-10-07). "Takaaki Kajita and Arthur McDonald share 2015 Physics Nobel".
584:
Su-Yang Xu; Ilya
Belopolski; Nasser Alidoust; Madhab Neupane; et al. (16 July 2015).
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Valencia, G. (1992). "Anomalous gauge-boson couplings at hadron supercolliders".
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Debrescu, B.A. (2005). "Massless gauge bosons other than the photon".
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586:"Discovery of a Weyl fermion semimetal and topological Fermi arcs"
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are massless, they can never be observed as free particles due to
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Although there are compelling theoretical reasons to believe that
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is zero. At present the only confirmed massless particle is the
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that are both believed to be massless; the other is the
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were originally thought to be massless – and possibly
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49:. Unsourced material may be challenged and removed.
308:). The only other confirmed gauge bosons are the
1807:
371:The Weyl fermions discovered in 2015 are merely
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248:Confirmed to exist; masslessness unconfirmed
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109:Learn how and when to remove this message
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16:Particle whose invariant mass is zero
661:Garisto, Robert (1 September 1998).
391:. However, because neutrinos change
47:adding citations to reliable sources
18:
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277:Purely hypothetical / unconfirmed
145:Other particles and quasiparticles
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23:
34:needs additional citations for
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343:proposed to be the carrier of
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533:10.1103/PhysRevLett.94.151802
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1698:History of subatomic physics
399:, led to Canadian scientist
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349:quantum theories of gravity
284:Standard Model gauge bosons
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1377:Double-charm tetraquark
671:Physical Review Letters
626:10.1126/science.aaa9297
502:Physical Review Letters
403:and Japanese scientist
409:Nobel prize in physics
296:) is one of two known
1774:Wave–particle duality
1764:Relativistic particle
901:Electron antineutrino
663:"Neutrinos have mass"
421:Relativistic particle
331:Hypothetical graviton
1004:Faddeev–Popov ghosts
754:Particles in physics
571:Princeton University
397:neutrino oscillation
171:Interaction mediated
43:improve this article
1779:Particle chauvinism
1722:Subatomic particles
618:2015Sci...349..613X
525:2005PhRvL..94o1802D
470:1992AIPC..272.1572V
426:Gravitational waves
345:gravitational force
203:Confirmed massless
131:elementary particle
58:"Massless particle"
1816:Special relativity
401:Arthur B. McDonald
339:is a hypothetical
244:Strong interaction
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407:sharing the 2015
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1161:Majorana fermion
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60: –
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54:Find sources:
48:
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38:
37:
32:This article
30:
26:
21:
20:
1794:
1758:
1465:Hypothetical
1413:Exotic atoms
1282:Omega baryon
1272:Sigma baryon
1262:Delta baryon
1014:Hypothetical
996:Ghost fields
982:Higgs boson
916:Tau neutrino
808:Charm (quark
695:
689:
678:. Retrieved
666:
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645:. Retrieved
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365:Weyl fermion
362:
341:tensor boson
334:
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306:strong force
298:gauge bosons
292:(carrier of
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158:Antiparticle
126:
120:
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96:
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41:Please help
36:verification
33:
1747:Quark model
1515:Theta meson
1418:Positronium
1330:Omega meson
1325:J/psi meson
1255:Antineutron
1166:Dark photon
1131:Graviphoton
1090:Stop squark
798:Down (quark
602:: 613–617.
273:Gravitation
1810:Categories
1489:Heptaquark
1450:Superatoms
1383:Pentaquark
1373:Tetraquark
1355:Quarkonium
1245:Antiproton
1146:Leptoquark
1081:Neutralino
843:antiquark)
833:antiquark)
828:Top (quark
823:antiquark)
813:antiquark)
803:antiquark)
793:antiquark)
762:Elementary
680:2023-11-14
647:2023-11-14
609:1502.03807
432:References
174:Existence
99:April 2022
69:newspapers
1727:Particles
1672:Particles
1631:Polariton
1621:Plasmaron
1591:Dropleton
1484:Hexaquark
1455:Molecules
1443:Protonium
1320:Phi meson
1305:Rho meson
1277:Xi baryon
1209:Composite
1045:Gravitino
788:Up (quark
714:0031-9228
665:. Focus.
642:206636457
385:Neutrinos
1703:timeline
1555:R-hadron
1510:Glueball
1494:Skyrmion
1428:Tauonium
1141:Inflaton
1136:Graviton
1116:Curvaton
1086:Sfermion
1076:Higgsino
1071:Chargino
1032:Gauginos
891:Neutrino
876:Antimuon
866:Positron
861:Electron
771:Fermions
634:26184916
598:(6248).
567:phys.org
541:15904133
486:18917295
415:See also
347:in some
337:graviton
254:Graviton
161:Charge (
1691:Related
1662:Baryons
1636:Polaron
1626:Plasmon
1601:Fracton
1596:Exciton
1550:Diquark
1545:Pomeron
1520:T meson
1477:Baryons
1438:Pionium
1423:Muonium
1350:D meson
1345:B meson
1250:Neutron
1235:Nucleon
1227:Baryons
1218:Hadrons
1181:Tachyon
1156:Majoron
1121:Dilaton
1050:Photino
886:Antitau
853:Leptons
667:aps.org
614:Bibcode
591:Science
549:7123874
521:Bibcode
466:Bibcode
393:flavour
379:phonons
325:hadrons
323:within
83:scholar
1667:Mesons
1616:Phonon
1611:Magnon
1533:Others
1503:Mesons
1396:Others
1292:Mesons
1240:Proton
1104:Others
1059:Others
1040:Gluino
974:Scalar
954:Photon
937:Bosons
780:Quarks
712:
640:
632:
547:
539:
484:
317:gluons
290:photon
180:Photon
155:Symbol
139:photon
133:whose
129:is an
85:
78:
71:
64:
56:
1655:Lists
1646:Trion
1641:Roton
1581:Anyon
1408:Atoms
1171:Preon
1111:Axion
1066:Axino
959:Gluon
946:Gauge
638:S2CID
604:arXiv
545:S2CID
511:arXiv
482:S2CID
456:arXiv
302:gluon
209:Gluon
90:JSTOR
76:books
1606:Hole
1433:Onia
1340:Kaon
1300:Pion
871:Muon
710:ISSN
630:PMID
600:AAAS
537:PMID
363:The
335:The
288:The
263:Self
234:Self
189:Self
168:Spin
152:Name
125:, a
62:news
881:Tau
702:doi
622:doi
596:349
529:doi
474:doi
452:272
121:In
45:by
1812::
708:.
700:.
673:.
669:.
636:.
628:.
620:.
612:.
594:.
588:.
569:.
565:.
543:.
535:.
527:.
519:.
507:94
505:.
480:.
472:.
464:.
450:.
411:.
141:.
1379:)
1375:(
1092:)
1088:(
746:e
739:t
732:v
716:.
704::
683:.
650:.
624::
616::
606::
551:.
531::
523::
513::
488:.
476::
468::
458::
269:2
266:0
259:G
240:1
237:0
222:g
195:1
192:0
185:Îł
165:)
163:e
112:)
106:(
101:)
97:(
87:·
80:·
73:·
66:·
39:.
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