Pions are particles created by the collision of the high-energy protons from the supernovas.
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The pions, in turn, will decay rapidly into very high-energy light, or gamma rays.
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K-longs (around a tenth of a percent of them) were decaying into a mere two pions.
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It decays into three pions, a complex process that takes more time to happen.
To make this discovery, the researchers sifted through four years of data tracking gamma-rays that were created by pions.
Those pions decay quickly into the gamma rays that the scientists tracked.
When a D0-meson decays, it produces daughter particles called pions and kaons.
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Collisions between the cosmic rays and the slower-moving protons that exist in the gas and the dust around a supernova should produce subatomic particles called neutral pions.
K-short, will decay into two further mesons, called pions.
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