|
|
| From | Message | ||
|---|---|---|---|
|
 Quantum PhysicsThere are six flavors of quark, named top, bottom, truth, beauty, strangeness, and charm. Why are quarks called quarks? The name comes from James Joyce's Ullyses, "three quarks for muster Mark!" Two quarks, a quark and antiquark pair, form a meson. A baryon is three quarks. Since there are six quarks, that makes 56 different types of baryon. But the truth quark (truth and beauty were renamed top and bottom) forms no baryon. Apparently it does not last long enough to partner with other quarks. That eliminates 21 possibilities, leaving 56-21=35 baryons. UUU, UUD, UDD, and DDD are delta baryons. In non excited states, UUD and UDD are special, with very long half lives. The UUD baryon is known as the proton. The U quark charge is +2/3, and the D quark charge is -1/3. So by now you will have added these up for the net proton charge, and guessed the name for the UDD baryon. |
||
|
Baryons UUU, UUD, UDD, DDD UUB, UBB, DDB, DBB BBB, BBS, BSS, SSS SSS, SSC, SCC, CCC UDB, UDS, UDC, UUS, USS, USC, UBS, UBC, UCC DBS, DBC, DSS, DSC, DCC BSC, BCC SSC, SCC, CCC That is 35 different baryons. Pretty sure I made no repeats. Notice the top quark is not in any of them. |
