Machine learning reveals nature of proton charm quarks.
Physics textbooks describe the proton as a subatomic particle that contains three quarks, bound together by elementary particles known as gluons.
But quantum theory predicts that the proton can contain other quark–antiquark pairs, including some quarks — known as charm quarks — that are more massive than the proton itself. These charm quarks are thought to be ‘intrinsic’, meaning that they are part of the proton over long timescales and not produced by interactions with a particle that is external to the proton
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