Maxwell's equations:
Name | Differential form | Integral form |
---|---|---|
Gauss's law: | ||
Gauss' law for magnetism (absence of magnetic monopoles): | ||
Faraday's law of induction: | ||
Ampère's law (with Maxwell's extension): |
Fermions have half-integer spin; for all known elementary fermions this is ½. Each fermion has its own distinct antiparticle. Fermions are the basic building blocks of all matter. They are classified according to whether they interact via the colour force or not. According to the Standard Model, there are 12 flavors of elementary fermions: six quarks and six leptons.
Generation | Name/Flavor | Electric charge (e) | Mass (MeV) | Antiquark | ||
1 | Up | (u) | +2/3 | 1.5 to 4 | antiup quark | |
Down | (d) | −1/3 | 4 to 8 | antidown quark | ||
2 | Strange | (s) | −1/3 | 80 to 130 | antistrange quark | |
Charm | (c) | +2/3 | 1,150 to 1,350 | anticharm quark | ||
3 | Bottom | (b) | −1/3 | 4,100 to 4,400 | antibottom quark | |
Top | (t) | +2/3 | 171,400 ± 2,100 | antitop quark |
Charged lepton / antiparticle | Neutrino / antineutrino | |||||||
Name | Symbol | Electric charge (e) | Mass (MeV) | Name | Symbol | Electric charge (e) | Mass (MeV) | |
---|---|---|---|---|---|---|---|---|
Electron / Positron | −1 / +1 | 0.511 | Electron neutrino / Electron antineutrino | 0 | < 0.0000022 [1] | |||
Muon | −1 / +1 | 105.7 | Muon neutrino / Muon antineutrino | 0 | < 0.17 [1] | |||
Tau lepton | −1 / +1 | 1,777 | Tau neutrino / Tau antineutrino | 0 | < 15.5 [1] |
Note that the neutrino masses are known to be non-zero because of neutrino oscillation, but their masses are sufficiently light that they have not been measured directly as of 2006.
Bosons have whole number spins. The fundamental forces of nature are mediated by gauge bosons, and mass is hypothesized to be created by the Higgs boson. According to the Standard Model the elementary bosons are:
Name | Charge (e) | Spin | Mass (GeV) | Force mediated |
Photon | 0 | 1 | 0 | Electromagnetism |
W± | ±1 | 1 | 80.4 | Weak nuclear |
Z0 | 0 | 1 | 91.2 | Weak nuclear |
Gluon | 0 | 1 | 0 | Strong nuclear |
Higgs | 0 | 0 | >112 | See below |
The Higgs boson (spin-0) is predicted by electroweak theory, and is the only Standard Model particle not yet observed. In the Higgs mechanism of the Standard Model, the massive Higgs boson is created by spontaneous symmetry breaking of the Higgs field. The intrinsic masses of the elementary particles (particularly the massive W± and Z0 bosons) would be explained by their interactions with this field. Many physicists expect the Higgs to be discovered at the Large Hadron Collider (LHC) particle accelerator now under construction at CERN.
(See rationalwiki for details.)
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