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Strong or weak force?

by R0CC0
Tags: force, strong, weak
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R0CC0
#1
Mar10-12, 11:26 PM
P: 18
1. The problem statement, all variables and given/known data
So all I want to know is how you tell if it is a strong or weak force interaction.
e.g. K^+ = pi^0 + pi^0 + pi^+ (all mesons)

So i determined that the energy was concerved:
493.7-135-135-139.6=84.1MeV

baryon and Lepton numbers are also conserved
(0)=(0)

Now having determined that the interaction is possible, how do I tell if it is via strong or weak force.
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gomboc
#2
Mar12-12, 09:05 AM
P: 39
The key here is to look at the quark content of the reactants and products. A positive kaon has an up and an anti-strange quark. Yet none of the pions contain a strange/anti-strange quark.

What is the only interaction capable of changing the flavour of quarks?
R0CC0
#3
Mar12-12, 09:01 PM
P: 18
So in this case weak force?

gomboc
#4
Mar12-12, 09:16 PM
P: 39
Strong or weak force?

Quote Quote by R0CC0 View Post
So in this case weak force?
The weak force is the only interaction that can change the flavour of a quark. The strong force can't.
R0CC0
#5
Mar12-12, 09:57 PM
P: 18
Righto Got it now. Thanks!


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