quark - antiquark pairs in mesons

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Offline fas

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quark - antiquark pairs in mesons
« on: 20/07/2009 14:56:49 »
Hola good guys...

im a little confused, since i cant wrap my head about this meson thingie. As far as i  understood it:
1) A meson is composed of an quark-antiquark pair
2) A meson decays by weak interaction

why wouldn't the quark-antiquark pair annihilate itself? they have opposing electrical charges and in my view should attract each other until they finally annihliate each other into a bunch of photons or whatever :)
Is the decay happening too fast for the electromagnetic interaction to take place?
Or can't i as so often use my intuiton on that kind of problem since the quantum world doesnt obey common sense?

thanks for your help



Offline Soul Surfer

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quark - antiquark pairs in mesons
« Reply #1 on: 20/07/2009 21:51:14 »
They do eventually decay and most mesons last a short time. This is nothing special  Remember it is possible for an electron and a positron meeting each other with an angular momentum componentto form several metastable states "orbiting" each other and emitting quanta of radiation before they finally anhilate each other and relase a pair of gamma rays.
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