Talk:Xi baryon

Hadron overhaul

Please give input at Talk:Hadron#Hadron overhaul. Thanks. Headbomb {^ταλκ_{κοντριβς} – WP Physics} 01:58, 24 January 2010 (UTC)[reply]

Xi-0 Lifetime

Should it be noted here that the Xi-0 Baryon has the longest mean lifetime of all non-Nucleon Baryons? If not, am I wrong about this? Thanks. —Preceding unsigned comment added by 98.169.1.50 (talk) 20:24, 2 July 2010 (UTC)[reply]

Xi_b^*0

I added a Xi sub b 0* (usb) to the baryon list, as it was discovered by CMS collab at CERN, and published results on 2012-04-27 (http://arxiv.org/pdf/1204.5955.pdf). List_of_baryons#jp_.3D_3.E2.81.842.2B_baryons. Could some one also add it here? --91.213.255.7 (talk) 01:49, 28 April 2012 (UTC)[reply]

Asterisks in J^P

There are numerous asterisks in the J^P column. What do they signify? Solo Owl 00:27, 18 November 2014 (UTC)

I had the same question about the asterisks on the isospin column. I don't see that the text explains this, but am guessing it has to do with varying isospin excitations. Wild guess. — Preceding unsigned comment added by 75.139.254.117 (talk) 20:45, 28 December 2016 (UTC)[reply]

Asterisks are also used in prose without explanation. -- Beland (talk) 18:59, 20 March 2021 (UTC)[reply]

Ah, notes have been added. -- Beland (talk) 19:07, 20 March 2021 (UTC)[reply]

@Headbomb: Thanks for this correction; I've added what I hope is a better note. Does that mean that the note in the "List of Xi baryons" section does not apply to the "Symbol" column? Also, what does the "′" in
Ξ′⁻
_b mean? -- Beland (talk) 20:26, 20 March 2021 (UTC)[reply]

The prime indicates that it's the non-Lamba-like octet member. Baryon nomenclature is silly and idiosyncratic. I did my entire master's thesis on this and on designing a better one. See the figures at the end of arXiv:1309.0517 for a list. Headbomb {t · c · p · b} 20:44, 20 March 2021 (UTC)[reply]

@Headbomb: Hmm, I'm not sure what you mean by "non-Lamba-like octet member". Based on the chart you referenced, it seems to have to do with more than just what quarks it is composed of. Is there a Wikipedia article we could link to that explains this? I also changed the note above the table; hopefully that's correct now? -- Beland (talk) 23:08, 24 March 2021 (UTC)[reply]

If you take the uds octet, there are two baryons made of uds quarks. The Σ⁰ and the Λ⁰, both made of uds quarks. If you pick instead udb, you can make analogous baryons. Nomenclature rules (established by the PDG in 1986) make their basename Xi, since they are both isospin doublets that aren't made of three u and d quarks, with a b subscript to indicate the s quark has been changed to a b quark. But there are two such udb states, one is the counterpart of the Σ⁰, which takes a prime (Ξ⁰
_b′), the other the counterpart of the Λ⁰, which doesn't take the prime (Ξ⁰
_b). Headbomb {t · c · p · b} 00:05, 25 March 2021 (UTC)[reply]

@Headbomb: Regarding this revert: The 14th row has a * in the Symbol column; I see what looks like Ξ^*-
_b. -- Beland (talk) 00:26, 25 March 2021 (UTC)[reply]

FTR, Headbomb has replaced the *s with ()s for uncertain values, and updated the note so there's no longer any confusion. (Thanks!) -- Beland (talk) 01:20, 14 April 2021 (UTC)[reply]

underscores or subscripts?

Don't the underscores in Xi_b'- and Xi_b*- represent subscripts? Bubba73 ^{You talkin' to me?} 04:25, 20 November 2014 (UTC)[reply]

FTR, there are no longer any underscores in the article. -- Beland (talk) 01:21, 14 April 2021 (UTC)[reply]

Merge Ξcc++

Generally on English Wikipedia, hadrons are grouped into articles about their main symbol. An exception being strange B meson, but that has been very well studied to the point where there's enough material for a separate article from B meson. The Ξcc++ baryon has only been observed in one decay mode in one paper (so far). I think it's far from being noteworthy enough for a separate article. — dukwon (talk) (contribs) 10:00, 7 September 2017 (UTC)[reply]

Really, these articles should all be split. It's how I organized them way back when for convenience, but it was a mistake I made when I thought these were related particles. Headbomb {t · c · p · b} 10:22, 7 September 2017 (UTC)[reply]

I agree that organisation by main symbol is not ideal, but I don't think there should be separate articles for every individual state. It's getting a bit silly with the exotic mesons (X(3872), Zc(3900), Z(4430), Y(4140)). If they're going to be re-organised, I suggest mimicking the PDG: [1]. — dukwon (talk) (contribs) 12:19, 7 September 2017 (UTC)[reply]

Mesons in general, are a fucking mess. Even non-exotic ones. I should know, I did a thesis on [originally] hadron nomenclatures, and mesons states were way too complicated to address. I managed to come up with a [IMO] much simpler naming scheme for baryons, but mesons were sadly too muddy to streamline. Headbomb {t · c · p · b} 12:25, 7 September 2017 (UTC)[reply]

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Requesting redirects

Can strange isodoublet and isospin doublet redirect here?

"XI-B" listed at Redirects for discussion

An editor has identified a potential problem with the redirect XI-B and has thus listed it for discussion. This discussion will occur at Wikipedia:Redirects for discussion/Log/2022 December 8 § XI-B until a consensus is reached, and readers of this page are welcome to contribute to the discussion. –LaundryPizza03 (d c̄) 18:29, 8 December 2022 (UTC)[reply]