T meson

T mesons are hypothetical mesons composed of a top quark and one additional subatomic particle. The second subatomic particle can be either an up antiquark (
T⁰
), down antiquark (
T⁺
), strange antiquark (
T⁺
_s), charm antiquark (
T⁰
_c) or bottom antiquark (
T⁺
_b).^[1] Because of the top quark's short lifetime, T mesons are not expected to be found in nature.^[2]

T meson

Composition	T0 : t u T+ : t d T+ s: t s T0 c: t c T+ b: t b
Statistics	bosonic
Family	meson
Interactions	strong, weak, gravitational, electromagnetic
Status	hypothetical
Symbol	T0 , T+ , T+ s, T0 c, T+ b
Antiparticle	T0 : T0 T+ : T− T+ s: T− s T0 c: T0 c T− b: T+ b
Electric charge	T0 , T0 c: 0 e T+ , T+ s, T+ b: +1 e
Topness	+1
Isospin	0

The combination of a top quark and top antiquark is not an open T meson, but rather a closed top-quark meson called toponium. Each T meson has an antiparticle that is composed of a top antiquark and an up (
T⁰
), down (
T⁻
), strange (
T⁻
_s), charm quark (
T⁰
_c) or bottom quark (
T⁻
_b) respectively.

References

1. C. Amsler; et al. (2008). "Review of Particle Physics: Naming Scheme for Hadrons" (PDF). Physics Letters B. 667 (1). Particle Data Group: 1. Bibcode:2008PhLB..667....1A. doi:10.1016/j.physletb.2008.07.018. hdl:1854/LU-685594. S2CID 227119789.
2. Fabiano, N. (1998). "Top mesons". European Physical Journal C. 2 (2): 345–350. arXiv:hep-ph/9704261. Bibcode:1998EPJC....2..345F. doi:10.1007/s100520050144. S2CID 17321939.

External links

• W.-M. Yao et al. (Particle Data Group), J. Phys. G 33, 1 (2006) and 2007 partial update for edition 2008 (URL: http://pdg.lbl.gov)