Quarks but if a proton is uud and a neutron is udd

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harp AP 2010
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I don't know much about quarks but if a proton is uud and a neutron is udd, is the (mass of a neutron)-(mass of proton)=mass of a down quark?
 
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neutron-proton would be d-u, but other interactions also contribute to the mass difference. It can get complicated.
 

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