A rare type of particle has emerged from proton collisions in the Large Hadron Collider.
The pion flies out of the nucleus, but the antiproton remains trapped inside, transforming the antihypertriton into antihelium.The process for the hypertriton goes the same way, except the hyperon decays into a proton and a negatively charged pion, and the nucleus is transformed into a plain old helium nucleus.Large Hadron Collider data
, using a new technique for identifying helium, something the collider was not originally designed for. And by measuring the masses of the nuclei, the team was able to trace their formation to the decay of hypertritons and antihypertritons: around 61 of the former, and 46 of the latter. The astrophysical implications are exciting. By gauging how antihelium is created and annihilated out in space, physicists can better constrain how much of it could feasibly be reaching Earth. This could validate or disprove thatThe discovery offers a new means for probing the properties of hypertritons. But the research has broader implications, too.
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