}})
|theorized = Mid 1970s
|discovered = DONUT collaboration (2000)
|symbol = {{math|{{SubatomicParticle|Tauon neutrino}} }}
|mass = Nonzero(See Neutrino mass)
|decay_time =
|decay_particle =
|electric_charge = 0 e
|color_charge = No
|spin = {{sfrac|1|2}}
|num_spin_states =
|weak_isospin = {{sfrac|1|2}}
|weak_hypercharge = âˆ’1
|chirality = left-handed (for right-handed neutrinos, see sterile neutrino)

}}The tau neutrino or tauon neutrino is an elementary particle which has the symbol {{math|{{SubatomicParticle|Tauon neutrino}}}} and zero electric charge. Together with the tau ({{math|Ï„}}), it forms the third generation of leptons, hence the name tau neutrino. Its existence was immediately implied after the tau particle was detected in a series of experiments between 1974 and 1977 by Martin Lewis Perl with his colleagues at the SLACâ€“LBL group.JOURNAL

, M.L., Perl
, etal
, 1975
, Evidence for anomalous lepton production in {{SubatomicParticle, Positron, {{SubatomicParticle|Electron}} annihilation
|journal=Physical Review Letters
|volume=35 |issue=22 |page=1489
|doi=10.1103/PhysRevLett.35.1489 |bibcode=1975PhRvL..35.1489P

}} The discovery of the tau neutrino was announced in July 2000 by the DONUT collaboration (Direct Observation of the Nu Tau).PRESS RELEASE

, Judy, Jackson
, etal
, 20 July 2000
, Physicists find first direct evidence for tau neutrino at Fermilab
, Fermilab
, Batavia, IL
,weblink

, JOURNAL

, K., Kodama
, DONUT, DONUT collaboration
, etal
, 2001
, Observation of tau neutrino interactions
, Physics Letters B
, 504, 3, 218â€“224
, 10.1016/S0370-2693(01)00307-0
, hep-ex/0012035, 2001PhLB..504..218D, 119335798
, In 2024, the IceCube Neutrino Observatory published findings of seven astrophysical tau neutrino candidates.{{Citation | vauthors=((Lea, Robert)) | date=March 14, 2024 | title=Scientists may have just caught 7 exotic "ghost particles" as they pierced through Earth | url=https://www.space.com/icecube-neutrinos-south-pole-cosmic-messengers | website=Space.com | access-date=16 March 2024}}{{Citation | vauthors=((Pennsylvania State University)) | title=IceCube identifies seven astrophysical tau neutrino candidates | website=phys.org | date=March 13, 2024 | url=https://phys.org/news/2024-03-icecube-astrophysical-tau-neutrino-candidates.html | access-date=16 March 2024}}

Discovery

The DONUT experiment from Fermilab was built during the 1990s to specifically detect the tau neutrino. These efforts came to fruition in July 2000, when the DONUT collaboration reported its detection. The tau neutrino is last of the leptons, and is the second most recent discovered particle of the Standard Model (i.e., it was observed 12 years before the discovery of the Higgs boson in 2012).

References

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Discovery

See also

References