Talk:Baryon
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My references say that baryons are elementary particles, they consist of quarks and cannot be broken down. Mesons also fit this description.
Two web sources for you to examine -[1] and[2]
Also my dictionary says:Hadron Pronunciation: (had'ron), [key] —n. Physics.
any elementary particle that is subject to the strong interaction. Hadrons are subdivided into baryons and mesons. Cf. quark.
All the sources I've seen don't call baryons as elementary particles, because they are composites, even if they can't be physically ripped apart. I would guess the usage varies, and so suggest that theynot be called elementary.
Give some citations - I'm sure we can sort it out. I've given three, but I acknowledge that they are all quoting generalist literature. By the way, the link toboson simply redirects to particle physics... surely they deserve their own article. -MMGB
Well I guess this is a case where infoplease got it wrong - some other sources I have checked confirm this position. If/When we have an article on elementary particles this confusion should be addressed directly.
Someone mentioned that mesons may be a superposition of quark-antiquark pairs, but I think it would be less confusing and more accurate to describe them as a pair where each of the quark and antiquarks may be in a superposition of states (colors and generations). Does this sound fair?
Does anyone know the mass of a baryon? Is it just the mass of a proton? or neutron? --PY— Precedingunsigned comment added byPoor Yorick (talk •contribs)06:10, 14 April 2003 (UTC)[reply]
PY, I believe that you are assuming that the baryon is a particle when it is actually a classification of particles. There are dozens of different baryons, each with its own mass.— Precedingunsigned comment added by4.226.252.15 (talk)09:38, 10 April 2004 (UTC)[reply]
Keep in mind that there was not a general consensus that hadrons were made of quarks until the mid-1970s. Older references could well describe them as elementary particles simply because their constituents were undiscovered or not generally accepted; even today they are sometimes called elementary particles because of a kind of language inertia. But we probably shouldn't call them that. --Matt McIrvin 00:29, 1 Oct 2004 (UTC)
This article lacks a table summarising the properties of the mentioned baryons. Obviously a comprehensive table of known baryons would be a bit too large for the article. :) But something like this might be nice:http://hyperphysics.phy-astr.gsu.edu/hbase/particles/baryon.html
A mention of the quantum numbers associated with baryons would be nice as well. (Baryon number, strangeness etc.)— Precedingunsigned comment added by128.163.161.40 (talk)06:12, 10 February 2005 (UTC)[reply]
Here's a first attempt, perhaps someone can check that there are no errors in it? (Either of fact or of format :) ). It includes all of the baryons mentioned in the article, in the order mentioned.
| Particle | Symbol | Makeup | Rest mass MeV/c2 | B | S | C | Mean lifetime s |
|---|---|---|---|---|---|---|---|
| Proton | p | uud | 938.3 | +1 | 0 | 0 | Stable1 |
| Neutron | n | ddu | 939.6 | +1 | 0 | 0 | 920 |
| Delta | Δ++ | uuu | 1232 | +1 | 0 | 0 | .6×10-23 |
| Delta | Δ+ | uud | 1232 | +1 | 0 | 0 | .6×10-23 |
| Delta | Δ0 | udd | 1232 | +1 | 0 | 0 | .6×10-23 |
| Delta | Δ- | ddd | 1232 | +1 | 0 | 0 | .6×10-23 |
| Lambda | Λ0 | uds | 1115.7 | +1 | -1 | 0 | 2.60×10-10 |
| Lambda | Λ+c | udc | 2285 | +1 | 0 | 1 | 2.0×10-13 |
| Sigma | Σ+ | uus | 1189.4 | +1 | -1 | 0 | 0.8×10-10 |
| Sigma | Σ0 | uds | 1192.5 | +1 | -1 | 0 | 6×10-20 |
| Sigma | Σ- | dds | 1197.4 | +1 | -1 | 0 | 1.5×10-10 |
| Xi | Ξ0 | uss | 1315 | +1 | -2 | 0 | 2.9×10-10 |
| Xi | Ξ- | dss | 1321 | +1 | -2 | 0 | 1.6×10-10 |
| Omega | Ω- | sss | 1672 | +1 | -3 | 0 | 0.82×10-10 |
— Precedingunsigned comment added byStarwed (talk •contribs)02:55, 11 February 2005 (UTC)[reply]
1at least 1030— Precedingunsigned comment added byXerxes314 (talk •contribs)18:17, 11 February 2005 (UTC)[reply]
It looks fine to me, except that some numbers aren't being written in proper scientific notation. Instead of 0.6×10-23, for example, it should be 6x10-24. I would edit it myself, but I haven't quite had the time to thoroughly look through the editing system.— Precedingunsigned comment added by172.130.4.182 (talk)05:56, 10 March 2005 (UTC)[reply]
After reading your post, I edited the scientific notation of the Deltas.— Precedingunsigned comment added by172.143.39.65 (talk)22:47, 10 March 2005 (UTC)[reply]
Are you sure that the neutron has a half-life of nine hundred and twentyseconds? That seems awfully short. Didn't someone have to build a really, really big detector to try to determine the half-life, because it was extremely long? [...] Okay, I looked it up, and neutrons do decay that quickly, but only when not bound inside nuclei. Should this be mentioned? I was led to the impression that we should all be big masses of Hydrogen-1 by now.grendel|khan 23:23, 2005 Mar 11 (UTC)
Thank you to the author of this article. You did a great job explaining in detail the topic; yet not too esoteric that someone without a strong background in physics won't understand the information (such as I). --jorgekluney— Precedingunsigned comment added by159.53.78.141 (talk)15:06, 1 June 2006 (UTC)[reply]
As of 2011, more than 40% of the total baryonic budget had not been discovered yet in "representative samples of the universe, found in large galaxy clusters".(Afshordi, Niayesh (March 1, 2012)."Where will Einstein fail? Leasing for Gravity and cosmology".Bullettin of Astronomical Society of India.40 (1).Astronomical Society of India, NASAAstrophysics Data System: 4.arXiv:1203.3827.OCLC 810438317. RetrievedJune 15, 2021. which also cites A.Simionescu (2011),Baryons in the outskirts of the X-ray brightest galaxy clusters, inProceedings, Exploring the X-Ray Universe: Suzaku and Beyond (SUZAKU 2011(: Palo Alto, USA, July 20-22, 2011, 5-12).
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