Timeline for Could a tetraquark $q \bar{q} q \bar{q}$ be colorless?
Current License: CC BY-SA 3.0
13 events
| when toggle format | what | by | license | comment | |
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| Apr 10, 2014 at 17:44 | answer | added | stanley dodds | timeline score: -1 | |
| Apr 10, 2014 at 8:10 | vote | accept | PML | ||
| Apr 9, 2014 at 16:12 | history | edited | PML | CC BY-SA 3.0 |
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| Apr 9, 2014 at 15:50 | comment | added | Jordan | $rgb$ isn't the only colorless combination. $r\bar{r} g \bar{g}$ and other such 4-quark states are colorless as well. | |
| Apr 9, 2014 at 15:28 | answer | added | innisfree | timeline score: 11 | |
| Apr 9, 2014 at 15:27 | comment | added | dmckee --- ex-moderator kitten | Tetraquarks fit just fine in the standard model and have been sought for a long time. They are neither baryon nor meson, but they are still hadrons. (I suppose the definition of "meson" might be extended to cover this case, but pentaquarks---if found for real---would call for a re-think.) | |
| Apr 9, 2014 at 14:20 | comment | added | PML | @innisfree That was my doubt, yes. But you answered it in you first comment. | |
| Apr 9, 2014 at 14:17 | comment | added | innisfree | ah hang on, I think this question is if $rgb$ is "white/colorless", a regular hadron of 3 quarks could be colourless, but how can four quarks give $rgb$ and end up being "colourless"? | |
| Apr 9, 2014 at 14:15 | comment | added | innisfree | Why can't $c \bar c d \bar u$ be color neutral? Doesn't $3\times\bar3\times3\times\bar3$ contain a singlet? | |
| Apr 9, 2014 at 14:07 | comment | added | PML | But then it can't be color neutral if it's composed by $c \bar{c}d \bar{u}$. I thought all hadrons had to be neutral. | |
| Apr 9, 2014 at 13:58 | comment | added | John Rennie | The Z(4430) is believed to be made up of quarks, or at least no-one is suggesting differently. It's just that it appears to be made up of four quarks not three. | |
| Apr 9, 2014 at 13:58 | comment | added | George G | The particle they found is a Tetraquark. The traditional quark model only had particles with 3 quarks or a quark-antiquark pair. | |
| Apr 9, 2014 at 13:50 | history | asked | PML | CC BY-SA 3.0 |