4 ms·

>The baryon known as Xi_b^* A word on your PR, physics.

jgrahamc 15y ago
Except that that isn't what it's called. That's the TeX way of describing it. Funny that their entire press release assumes you are looking through a TeX or LaTeX lens :-) It should actually look like this: http://equationater.com/84e00ccd9705dca5bc0917a33e162502.png http://equationater.com/84e00ccd9705dca5bc0917a33e162502.png If you look at the full list of baryons on Wikipedia you'll see that it's one of many in this format: http://en.wikipedia.org/wiki/List_of_baryons http://en.wikipedia.org/wiki/List_of_baryons This is a Xi. The particle Xi_b^ comprises one “up”, one “strange” and one “bottom” quark (usb)* So, it's an up strange bottom (usb) baryon.
- redthrowaway 15y ago
  Interesting. Thank you for clarifying that.
- adavies42 15y ago
  two questions-- how does that differ from \Xi_b^0, which also seems to be a usb baryon? is there a standard way to pronounce those symbols (e.g. "xi star sub-b")?
  - sp332 15y ago
    Close, it's just like "zeye star bee". (edited)
  - starwed 15y ago
    I believe the difference is in the overall angular momentum. (You can think that the quarks are somehow arranged differently inside the particle.) You can look at the particle data group's entries[1,2] for \Xi_b^0, which has J=1/2 and for \Xi_b^*, which has J=3/2. [1]http://pdglive.lbl.gov/Rsummary.brl?nodein=S060&exp=Y&sub=Yr&return=BXXX045 http://pdglive.lbl.gov/Rsummary.brl?nodein=S060&exp=Y&#3... [2]http://pdglive.lbl.gov/Rsummary.brl?nodein=S062&sub=&return=SumB http://pdglive.lbl.gov/Rsummary.brl?nodein=S062&sub=&#38... -edit- Also, found a line on wikipedia discussing the notation of baryons that confirms this: >Baryons in total angular momentum J = 3⁄2 configuration that have the same symbols as their J = 1⁄2 counterparts are denoted by an asterisk.
  - sp332 15y ago
    I just found this line in the article: The new discovery means that two of the three baryons predicted in the usb composition by theory have now been observed. It's not much to go on, but apparently there should be 3 usb baryons.
- deleted 15y ago
  [deleted]
- chimeracoder 15y ago
  > Funny that their entire press release assumes you are looking through a TeX or LaTeX lens :-) I'm glad! This is a great way to filter out news sources that I actually want to read, rather than sensational 'ZOMG - Neutrinos are faster than light!!! Einstein was wrong!!!' drivel that was all over the place a few months back. I mean, seriously - can you imagine someone like Fox News publishing news articles with embedded TeX?
- ot 15y ago
  > Funny that their entire press release assumes you are looking through a TeX or LaTeX lens :-) Interestingly, I didn't even notice until it was pointed out here. I guess that the LaTeX glasses are pretty strong :) Maybe it would have stood out if surrounded by $$...
deleted 15y ago
[deleted]

Except that that isn't what it's called. That's the TeX way of describing it. Funny that their entire press release assumes you are looking through a TeX or LaTeX lens :-) It should actually look like this: http://equationater.com/84e00ccd9705dca5bc0917a33e162502.png http://equationater.com/84e00ccd9705dca5bc0917a33e162502.png If you look at the full list of baryons on Wikipedia you'll see that it's one of many in this format: http://en.wikipedia.org/wiki/List_of_baryons http://en.wikipedia.org/wiki/List_of_baryons This is a Xi. The particle Xi_b^ comprises one “up”, one “strange” and one “bottom” quark (usb)* So, it's an up strange bottom (usb) baryon.

redthrowaway 15y ago
Interesting. Thank you for clarifying that.
adavies42 15y ago
two questions-- how does that differ from \Xi_b^0, which also seems to be a usb baryon? is there a standard way to pronounce those symbols (e.g. "xi star sub-b")?
- sp332 15y ago
  Close, it's just like "zeye star bee". (edited)
- starwed 15y ago
  I believe the difference is in the overall angular momentum. (You can think that the quarks are somehow arranged differently inside the particle.) You can look at the particle data group's entries[1,2] for \Xi_b^0, which has J=1/2 and for \Xi_b^*, which has J=3/2. [1]http://pdglive.lbl.gov/Rsummary.brl?nodein=S060&exp=Y&sub=Yr&return=BXXX045 http://pdglive.lbl.gov/Rsummary.brl?nodein=S060&exp=Y&#3... [2]http://pdglive.lbl.gov/Rsummary.brl?nodein=S062&sub=&return=SumB http://pdglive.lbl.gov/Rsummary.brl?nodein=S062&sub=&#38... -edit- Also, found a line on wikipedia discussing the notation of baryons that confirms this: >Baryons in total angular momentum J = 3⁄2 configuration that have the same symbols as their J = 1⁄2 counterparts are denoted by an asterisk.
- sp332 15y ago
  I just found this line in the article: The new discovery means that two of the three baryons predicted in the usb composition by theory have now been observed. It's not much to go on, but apparently there should be 3 usb baryons.
deleted 15y ago
[deleted]
chimeracoder 15y ago
> Funny that their entire press release assumes you are looking through a TeX or LaTeX lens :-) I'm glad! This is a great way to filter out news sources that I actually want to read, rather than sensational 'ZOMG - Neutrinos are faster than light!!! Einstein was wrong!!!' drivel that was all over the place a few months back. I mean, seriously - can you imagine someone like Fox News publishing news articles with embedded TeX?
ot 15y ago
> Funny that their entire press release assumes you are looking through a TeX or LaTeX lens :-) Interestingly, I didn't even notice until it was pointed out here. I guess that the LaTeX glasses are pretty strong :) Maybe it would have stood out if surrounded by $$...

deleted 15y ago

[deleted]