A | B | C | D | E | F | G | H | CH | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
Composition | |
---|---|
Statistics | Bosonic |
Family | Mesons |
Interactions | Strong, weak, electromagnetic, gravity |
Symbol | ω |
Antiparticle | Self |
Theorized | Yoichiro Nambu[1] (1957) |
Discovered | Lawrence Berkeley National Laboratory (1961)[2][3] |
Types | 1 |
Mass | 782.66±0.13 MeV/c2 |
Mean lifetime | (7.58±0.11)×10−23 s |
Decays into | π+ + π0 + π− or π0 + γ |
Electric charge | 0 e |
Spin | 1 |
Isospin | 0 |
Hypercharge | 0 |
Parity | −1 |
C parity | −1 |
The omega meson (
ω
) is a flavourless meson formed from a superposition of an up quark–antiquark and a down quark–antiquark pair. It is part of the vector meson nonet[4][5] and mediates the nuclear force along with pions and rho mesons.
Properties
The most common decay mode for the ω meson is
π+
π0
π−
at 89.2±0.7%, followed by
π0
γ
at 8.34±0.26%.[6]
Particle name | Particle symbol |
Antiparticle symbol |
Quark content |
Rest mass (MeV/c2) | IG | JPC | S | C | B' | Mean lifetime (s) | Commonly decays to (>5% of decays) |
---|---|---|---|---|---|---|---|---|---|---|---|
Omega meson[6] | ω (782) |
Self | 782.66 ± 0.13 | 0− | 1−− | 0 | 0 | 0 | (7.58±0.11)×10−23 s | π+ + π0 + π− or π0 + γ |
The quark composition of the
ω
meson can be thought of as a mix between
u
u
,
d
d
and
s
s
states, but it is very nearly a pure symmetric
u
u
-
d
d
state. This can be shown by deconstructing the wave function of the
ω
into its component parts. We see that the
ω
and
ϕ
mesons are mixtures of the SU(3) wave functions as follows.[7]
- ,
- ,
where
- is the nonet mixing angle,
- and
- .
The mixing angle at which the components decouple completely can be calculated to be , which almost corresponds to the actual value calculated from the masses of 35°. Therefore, the
ω
meson is nearly a pure symmetric
u
u
-
d
d
state.
See also
References
- ^ Nambu, Yoichiro (April 25, 1957). "Possible Existence of a Heavy Neutral Meson". Physical Review. 106 (6): 1366–1367. Bibcode:1957PhRv..106.1366N. doi:10.1103/PhysRev.106.1366.
- ^ Maglić, B. C.; Alvarez, L. W.; Rosenfeld, A. H.; Stevenson, M. L. (August 14, 1961). "Evidence for a T=0 three-pion resonance". Physical Review Letters. 7 (5): 178–182. Bibcode:1961PhRvL...7..178M. doi:10.1103/physrevlett.7.178. S2CID 121570977.
- ^ Maglich, B. (1976). "Discovery of omega meson-first neutral vector meson: one researcher's personal account - Discovery story". Advanced Experimental Physics. 5: 79–105.
- ^ Gell-Mann, M. (March 15, 1961). "The Eightfold Way: A Theory of Strong Interaction Symmetry" (TID-12608). Pasadena, CA: California Inst. of Tech., Synchrotron Laboratory: 24. doi:10.2172/4008239.
{{cite journal}}
: Cite journal requires|journal=
(help) - ^ Ne'eman, Y. (August 1961). "Derivation of Strong Interactions from a Gauge Invariance". Nuclear Physics. 26 (2). Amsterdam: North-Ho lland Publishing Co.: 222–229. Bibcode:1961NucPh..26..222N. doi:10.1016/0029-5582(61)90134-1.
- ^ a b Zyla, P. A. (2021) . "Particle listing - ω(782)" (PDF). Particle Data Group. Retrieved June 9, 2021.
- ^ Amsler, C.; DeGrand, T.; Krusche, B. (August 2019). "15. Quark Model" (PDF). Particle Data Group. Retrieved 9 June 2021.
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