The NA51 experiment produced only one data point, and suggested that there are more anti-down quarks in the proton than anti-up quarks, at the fractional momentum studied in the experiment.

The proton can contain pairs of elementary particles known as strange quarks. The contribution of these particles to the proton's electric-charge distribution and magnetic moment has been determined.

Inside every proton in every atom in the universe is a pressure cooker environment that surpasses the atom-crushing heart of a neutron star. That's according to the first measurement of a ...

Inside every proton in every atom in the universe is a pressure cooker environment that surpasses the atom-crushing heart of a neutron star. That's according to the first measurement of a ...

You often hear that each nucleon, like a proton or neutron, has three quarks inside of it, and that the quarks exchange gluons. But that isn’t the full picture at all.

The tensor charge in protons is the net transverse spin of the proton or the quarks that make it up. The only way to obtain the tensor charge from experimental data is using the theory of quantum ...

The intrinsic charm quarks carry about 0.6 percent of a proton’s momentum, the researchers report. But 5 sigma is typically required for a conclusive result.

But for gentler collisions like SLAC’s, where the proton acts like three quarks that mutually keep their distance, these quarks pull on each other strongly enough that QCD calculations become ...

Proton’s mass radius is apparently shorter than its charge radius The quarks that give it charge aren't hanging out with the gluons that provide mass.

“There are six kinds of quarks in nature, three are lighter than the proton [up, down, and strange quarks] and three are heavier [charm, up, and down quarks],” Stefano Forte, NNPDF ...