Cosmic production of quarkonium?

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It has been suggested that pair annihilation of heavy Majorana fermions in the galactic halo into quarkonium plus a monochromatic photon could occur at an observable rate. Here we show that a calculation of Srednicki, Theisen, and Silk seriously overestimates the rate for this process, by an order of magnitude or more, as a result of neglecting the bound-state structure of quarkonium. It may nevertheless still be possible to resolve the correspondingly smaller gamma-ray line flux over the diffuse cosmic background by use of the currently planned space-borne superconducting-magnet spectrometer facility with an energy resolution of 1% or better.

Original languageEnglish (US)
Pages (from-to)2128-2131
Number of pages4
JournalPhysical Review Letters
Issue number20
StatePublished - Jan 1 1986

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