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However, if the confinement scale of the interaction is small compared to the mass of the fundamental fermions (M~Q~ M Q >> ?), QCD-like string breaking by spontaneous production of fermion-antifermion pairs, as in the familiar jet fragmentation of QCD, is exponentially suppressed. In this case, the fermions, called "quirks", are bound in pairs by stable "infracolor" strings. The large range of quirk masses and infracolor confinement scales allowed by previous measurements and cosmological constraints results in widely varied and rather bizarre phenomenologies that present unusual challenges for detection.
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