protons were considered three-quark particles composed of two "up" quarks and one "down" quark. However, if there have been recent discoveries or developments since then suggesting that protons might have intrinsic charm, I would not be aware of them.
In the context of particle physics, quarks are elementary particles that are the fundamental building blocks of matter. They come in six flavors: up, down, charm, strange, top, and bottom. The up and down quarks are the lightest and most commonly found in ordinary matter, while the charm, strange, top, and bottom quarks are typically associated with more exotic and short-lived particles.
If protons were found to have intrinsic charm, it would mean that they contain a charm quark as one of their constituent quarks, in addition to the usual up and down quarks. This would make them five-quark particles, which would challenge the conventional understanding of proton structure.
However, it's important to note that any recent developments or discoveries regarding the intrinsic charm of protons would require verification and validation through further experimental evidence and scientific scrutiny. Scientific knowledge is constantly evolving, and new findings can sometimes challenge existing theories.