For the first time, researchers from the ALICE experiment at the Large Hadron Collider (LHC) have directly observed the dead-cone effect of quantum chromodynamics. The research report was published in the journal Nature. Particle collisions produce quarks and gluons, which are called partons in particle physics. After being created, they go through a chain of events called a parton shower, where they lose energy by emitting radiation in the form of gluons, which also emit gluons. The radiation pattern of rain depends on the mass of the parton emitting gluons, creating a region around the flight direction of the parton where gluon emission is suppressed, called the dead space. The blind spot effect was observed indirectly at particle colliders three decades ago, and direct observation is extremely challenging.
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