On the breaking of collinear factorization in QCD

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    We investigate the breakdown of collinear factorization for non-inclusive observables in hadron-hadron collisions. For pure QCD processes, factorization is violated at the three-loop level and it has a structure identical to that encountered previously in the case of super-leading logarithms. In particular, it is driven by the non-commutation of Coulomb/Glauber gluon exchanges with other soft exchanges. Beyond QCD, factorization may be violated at the two-loop level provided that the hard subprocess contains matrix element contributions with phase differences between different colour topologies. © SISSA 2012.
    Original languageEnglish
    Article number066
    JournalThe Journal of High Energy Physics
    Issue number11
    Publication statusPublished - 2012


    • Jets
    • QCD phenomenology


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