Back Onderkwark Afrikaans كوارك قعري Arabic Quark fondu AST B-кварк Byelorussian Дънен кварк Bulgarian Quark b Catalan Kvark b Czech Bottom-kvark Danish Bottom-Quark German Cuark fondo Spanish
| Composition | elementary particle |
|---|---|
| Statistics | fermionic |
| Family | quark |
| Generation | third |
| Interactions | strong, weak, electromagnetic, gravity |
| Symbol | b |
| Antiparticle | bottom antiquark ( b ) |
| Theorized | Makoto Kobayashi and Toshihide Maskawa (1973)[1] |
| Discovered | Leon M. Lederman et al. (1977)[2] |
| Mass | 4.18+0.04 −0.03 GeV/c2 (MS scheme)[3] 4.65+0.03 −0.03 GeV/c2 (1S scheme)[4] |
| Decays into | charm quark or up quark |
| Electric charge | −1/3 e |
| Color charge | yes |
| Spin | 1/2 ħ |
| Weak isospin | LH: −+1/2, RH: 0 |
| Weak hypercharge | LH: 1/3, RH: −+2/3 |
The bottom quark, beauty quark, or b quark, is an elementary particle of the third generation. It is a heavy quark with a charge of −1/3 e.
All quarks are described in a similar way by electroweak interaction and quantum chromodynamics, but the bottom quark has exceptionally low rates of transition to lower-mass quarks. The bottom quark is also notable because it is a product in almost all top quark decays, and is a frequent decay product of the Higgs boson.
- ^ Cite error: The named reference
KMwas invoked but never defined (see the help page). - ^ "Discoveries at Fermilab – Discovery of the Bottom Quark" (Press release). Fermilab. 7 August 1977. Retrieved 24 July 2009.
- ^ M. Tanabashi et al. (Particle Data Group) (2018). "Review of Particle Physics". Physical Review D. 98 (3): 030001. Bibcode:2018PhRvD..98c0001T. doi:10.1103/PhysRevD.98.030001. hdl:10044/1/68623.
- ^ J. Beringer (Particle Data Group); et al. (2012). "PDGLive Particle Summary 'Quarks (u, d, s, c, b, t, b', t', Free)'" (PDF). Particle Data Group. Archived from the original (PDF) on 12 May 2013. Retrieved 18 December 2012.