So a particle has intrinsic parity ##\pm 1 ## .(adsbygoogle = window.adsbygoogle || []).push({});

The parity of a system of particles is given by product of intrinsic parities and the result is: ##(-1)^l ## (1).

Questions:

1) How does this result follow?

and what exactly is ##l## here? so it's the orbital angular momentum, so say a particle is made up of 3 quarks, then it's described to be in a certain state, ##1p## , ##1s## states etc, so ##l## is the orbital angular momentum of this state?

2) For a meson ##p=(-1)^{l+1}##

The reasoning in my book being that the quark and antiquark have opposite intrinsic parities,

So I assume this followss from (1), although I am not seeing how??

But, in the result (1) , this is a general result for any system of particles right? So quarks and antiquarks of the same type could be included in any system yet ## (-1)^l ## still holds?

Thanks in advance.

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# Parity formulae, orbital angular momentum, mesons

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