# Ways of remembering quark structure of mesons?

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#1
There's only 6 I need to know for AS Level physics (Pions and Kaons, +, - and 0) but does anyone have any mnemonics or anything to help them remember the quark composition of these mesons?
0
5 years ago
#2
Well mesons are one normal and one antiquark, and with Pions and Kaons (+ versions) the normal particle is the up quark in both cases. So that's a help, and then the -ones are just the reverse. If you only need to know those two then just remember that pions are up-antidown and kaons are up-antistrange. Frankly, because the spelling of Kaon is strange.

I can't remember the structure of the 0 versions at the moment, but do you need to remember those is your exam anyway?
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#3
I completely missed this reply, sorry about that. I didn't find a way of remembering them, per se. I simply draw a table instead (lowercase for anti-quarks):

Meson + - 0
Pion uD Ud Uu/Dd
Kaon uS Us Ds

You can see that the "antis" are in line with each other for + and -, that helps me a lot
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5 years ago
#4
Just remember how to work them out, Kaons contain strange quarks, Pions don't and you can work it out from there as they will both have a baryon number of 0.
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#5
(Original post by Chris654)
Just remember how to work them out, Kaons contain strange quarks, Pions don't and you can work it out from there as they will both have a baryon number of 0.
That is a helpful tip in case I forget, thanks!
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5 years ago
#6
I just remember them as Pions = DSU (which is all the antiquarks) and Kaons = SDSU (again all the antiquarks)
I know the pairs it was just remembering which are antiquarks and which are quarks for me!
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5 years ago
#7
Just remember the quark compositions for (K+ and π+) and the anti version will be the opposite
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