“The radius of this mass structure is smaller than the charge radius, and so it kind of gives us a sense of the hierarchy of the mass versus the charge structure of the nucleon,” said experiment co-spokesperson Mark Jones, Jefferson Lab’s Halls A&C leader.Īccording to experiment co-spokesperson Zein-Eddine Meziani, a staff scientist at DOE’s Argonne National Laboratory, this result actually came as somewhat of a surprise. The result also seems to indicate that this core has a different size than the proton’s well-measured charge radius, a quantity that is often used as a proxy for the proton’s size. The radius of this core of matter was found to reside at the center of the proton. This new measurement may have finally shed some light on the mass that is generated by the proton’s gluons by pinpointing the location of the matter generated by these gluons. Next, it gets mass from the strong force energy that glues those quarks together, with this force manifesting as ‘gluons.’ Lastly, it gets mass from the dynamic interactions of the proton’s quarks and gluons. First, it gets some mass from the masses of its quarks, and some more from their movements. Over the last few decades, nuclear physicists have tentatively pieced together that the proton’s mass comes from several sources. “If you add up the Standard Model masses of the quarks in a proton, you only get a small fraction of the proton’s mass,” explained experiment co-spokesperson Sylvester Joosten, an experimental physicist at DOE’s Argonne National Laboratory.
It turns out that the proton’s measured mass doesn’t just come from its physical building blocks, its three so-called valence quarks.
One of the biggest mysteries of the proton is the origin of its mass. The result was recently published in Nature. Department of Energy’s Thomas Jefferson National Accelerator Facility has revealed the radius of the proton’s mass that is generated by the strong force as it glues together the proton’s building block quarks. A recent experiment carried out at the U.S. NEWPORT NEWS, VA – Nuclear physicists may have finally pinpointed where in the proton a large fraction of its mass resides. Experimental determination of the proton’s gluonic gravitational form factors may have revealed part of proton’s hidden mass
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