All articles tagged with #hadrons
At CERN, the LHCb collaboration announced the discovery of a proton‑like baryon made of two charm quarks and one down quark, about four times the proton’s mass, observed with 7-sigma significance in Run 3 data; it’s the second baryon with two heavy quarks and a key test for quantum chromodynamics, including a shorter lifetime than the up-quark counterpart, and follows upgrades to the LHCb detector completed in 2023.
Scientists have calculated the trace anomaly for nucleons and pions, revealing insights into how mass is distributed in hadrons, such as protons and neutrons. This research, published in Physical Review D, uses lattice quantum chromodynamics to simulate mass distribution, showing similarities between the pion's mass and the neutron's charge distribution, and the nucleon's mass and the proton's charge distribution. These findings are crucial for understanding the nucleon mass and will guide future experiments at the Electron-Ion Collider to explore the inner structure of protons.