Charm quark
| Composition | Elementary particle |
|---|---|
| Statistics | Fermionic |
| Generation | Second |
| Interactions | Strong, Weak, Electromagnetic force, Gravity |
| Symbol | c |
| Antiparticle | Charm antiquark ( c ) |
| Theorized |
Sheldon Glashow, John Iliopoulos, Luciano Maiani (1970) |
| Discovered |
Burton Richter et al. (SLAC) (1974) Samuel Ting et al. (BNL) (1974) |
| Mass | 1.29+0.05 −0.11 GeV/c2 |
| Decays into | Strange quark (~95%), Down quark (~5%) |
| Electric charge | +2/3 e |
| Color charge | Yes |
| Spin | 1/2 |
| Weak isospin | LH: +1/2, RH: 0 |
| Weak hypercharge | LH: +1/3, RH: +4/3 |
The charm quark or c quark (from its symbol, c) is the third most massive of all quarks, a type of elementary particle. Charm quarks are found in hadrons, which are subatomic particles made of quarks. Example of hadrons containing charm quarks include the J/ψ meson (
J/ψ
), D mesons (
D
), charmed Sigma baryons (
Σ
c), and other charmed particles.
It, along with the strange quark is part of the second generation of matter, and has an electric charge of +2/3 e and a bare mass of 1.29+0.05
−0.11 GeV/c2. Like all quarks, the charm quark is an elementary fermion with spin 1/2, and experiences all four fundamental interactions: gravitation, electromagnetism, weak interactions, and strong interactions. The antiparticle of the charm quark is the charm antiquark (sometimes called anticharm quark or simply anticharm), which differs from it only in that some of its properties have equal magnitude but opposite sign.
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Wikipedia