Abstract
It is shown that an instanton-induced interaction between quarks produces a very deeply bound H dibaryon with mass below 2M N , viz., M H =1718 MeV. Therefore the H dibaryon is predicted to be a stable particle. The reaction of photodisintegration of the H dibaryon to 2Λ in the course of its motion in the cosmic microwave background will result in a new possible cutoff in the cosmic-ray spectrum. This provides an explanation for the ultrahigh-energy cosmic ray events observed above the GZK cutoff as being the result of the strong interaction of high-energy H dibaryons from cosmic rays with nuclei in the Earth’s atmosphere.
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Pis’ma Zh. Éksp. Teor. Fiz. 70, No. 8, 483–486 (25 October 1999)
Published in English in the original Russian journal. Edited by Steve Torstveit.