Onderkwark

Onderkwark
Die onderkwark se plek in die Standaardmodel (onder kwarke).
Die onderkwark se plek in die Standaardmodel (onder kwarke).
Samestelling Elementêre deeltjie
Statistiek Fermionies
Groep Kwarke
Generasie Derde
Wisselwerking Sterk, swak, elektromagneties, swaartekrag
Simbool b
Antideeltjie Onder-antikwark
Geteoretiseer Makoto Kobayashi en Toshihide Maskawa (1973)[1]
Ontdek Leon M. Lederman et al. (1977)[2]
Massa 4,18+0,03−0,03 GeV/c2 (MS-skema)[3]

4,65+0,03−0,03 GeV/c2 (1S-skema)[3]

Verval in Sjarme- of opkwark
Elektriese lading -1/3 e
Kleurlading Ja
Spin 1/2
Swak isospin LH: -1/2, RH: 0
Swak hiperlading LH: +1/3, RH: -2/3

Die onderkwark of b-kwark (simbool: b, van die Engelse bottom quark) is ’n soort elementêre deeltjie. Dit is ’n derdegenerasie-kwark, het ’n elektriese lading van −1⁄3 e en ’n groot massa van 4 200 MeV/c2, ’n bietjie meer as vier keer dié van ’n proton.

Die onderkwark is die produk van die verval byna alle bokwarke. Hulle kan self verval in óf ’n op- of ’n sjarmekwark via die swak krag. Hul antideeltjie is die onder-antikwark of anti-onder), waarvan sekere eienskappe dieselfde magnitude maar teenoorgestelde teken het.

Hierdie artikel is vertaal uit die Engelse Wikipedia

  1. ↑ M. Kobayashi; T. Maskawa (1973). "CP-Violation in the Renormalizable Theory of Weak Interaction". Progress of Theoretical Physics. 49 (2): 652–657. Bibcode:1973PThPh..49..652K. doi:10.1143/PTP.49.652. Geargiveer vanaf die oorspronklike op 24 Desember 2008. Besoek op 22 Desember 2018.
  2. ↑ Fermilab (7 Augustus 1977). "Discoveries at Fermilab – Discovery of the Bottom Quark". Persberig. http://www.fnal.gov/pub/inquiring/physics/discoveries/bottom_quark_pr.html. Besoek op 2009-07-24. 
  3. ↑ 3,0 3,1 J. Beringer et al. (Particle Data Group) (2012). "PDGLive Particle Summary 'Quarks (u, d, s, c, b, t, b′, t′, Free)'" (PDF). Particle Data Group. Besoek op 18 Desember 2012.

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