Protons contain intrinsic charm quarks, a new study suggests

The massive quarks — counterintuitively heavier than the proton itself — might carry about 0.6 percent of a proton’s momentum.

Decoding the Spin of the Proton from Quarks and Gluons: Gauss Centre for Supercomputing e.V.

LHCb discovers first “open-charm” tetraquark

Course: Physics, Topic: Unit 9: PROPERTIES AND BASIC PRINCIPLES OF QUARKS

What we know and what we don't know about the proton spin after 30 years

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Evidence for intrinsic charm quarks in the proton

Do protons contain intrinsic charm quarks too?

What Are Quarks? – World of Subatomic Particles – Evincism

PDF) Evidence for intrinsic charm quarks in the proton

Quarks charm on protons - Electrical e-Library.com

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Standard model gets right answer for proton, neutron masses