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Because charge is conserved , it is not possible to create an antiparticle without either destroying another particle of the same charge ( as is for instance the case when antiparticles are produced naturally via beta decay or the collision of cosmic rays with Earth 's atmosphere ) , or by the simultaneous creation of both a particle " and " its antiparticle , which can occur in particle accelerators such as the Large Hadron Collider at CERN .
 Large Hadron Collider, CERN
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
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Answer:
 Large Hadron Collider, CERN