Pairwise Multiparticle States and the Monopole Unitarity Puzzle

Csaba Csáki, Yuri Shirman, Ofri Telem, John Terning

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We suggest a novel resolution for a decades old mystery - what happens when a positron scatters off a minimal grand-unification-theory monopole in an s wave, a puzzle first discussed by Callan in 1983. Using the language of on shell amplitudes and pairwise helicity we suggest that the final state contains two up quarks and a down quark in an entangled "pairwise"multiparticle state - the only particle final state that satisfies angular momentum and gauge charge conservation. The cross section for this process is as large as in the original Rubakov-Callan effect, only suppressed by the QCD scale. The final state we find cannot be seen in Callan's truncated 2D theory, since our new pairwise state appears only in more than two dimensions.

Original languageAmerican English
Article number181601
JournalPhysical Review Letters
Issue number18
StatePublished - 28 Oct 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2022 authors. Published by the American Physical Society.


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