Strange quark
| Composition | Elementary particle |
|---|---|
| Statistics | Fermionic |
| Generation | Second |
| Interactions | Strong, Weak, Electromagnetic force, Gravity |
| Symbol | s |
| Antiparticle | Strange antiquark ( s ) |
| Theorized |
Murray Gell-Mann (1964) George Zweig (1964) |
| Discovered | 1968, SLAC |
| Mass | 95+5 −5 MeV/c2 |
| Decays into | Up quark |
| Electric charge | −1/3 e |
| Color charge | Yes |
| Spin | 1/2 |
| Weak isospin | LH: −1/2, RH: 0 |
| Weak hypercharge | LH: 1/3, RH: −2/3 |
The strange quark or s quark (from its symbol, s) is the third-lightest of all quarks, a type of elementary particle. Strange quarks are found in subatomic particles called hadrons. Example of hadrons containing strange quarks include kaons (
K
), strange D mesons (
D
s), Sigma baryons (
Σ
), and other strange particles.
According to the IUPAP the symbol s is the official name, while strange is to be considered only as a mnemonic. The name sideways has also been used because the s quark has a T3 value of 0 while the u (“up”) and d (“down”) quarks have values of +1/2 and −1/2 respectively.
Along with the charm quark, it is part of the second generation of matter, and has an electric charge of −1/3 e and a bare mass of 95+5
−5 MeV/c2. Like all quarks, the strange 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 strange quark is the strange antiquark (sometimes called antistrange quark or simply antistrange), which differs from it only in that some of its properties have equal magnitude but opposite sign.
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Wikipedia