Saturday, December 27, 2014

particle physics - Can quarks of different colors annihilate?


Wikipedia: "Antiparticles have exactly opposite additive quantum numbers from particles, so the sums of all quantum numbers of the original pair are zero."


Is it possible to annihilate a quark-antiquark pair if the antiquark has a color different from the quark?


Eg.: Will red up and anti-green anti-up annihilate? And if so, what is the product?



Answer




Well, you can just take the ordinary quark/anti-quark/gluon vertex for that and get a red/anti-green gluon (which will then decay/hadronize further, since it is color-charged and thus confined).


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