Jet axes and universal transverse-momentum-dependent fragmentation

  • Duff Neill
  • Ignazio Scimemi
  • Wouter J. WaalewijnEmail author
Open Access
Regular Article - Theoretical Physics


We study the transverse momentum spectrum of hadrons in jets. By measuring the transverse momentum with respect to a judiciously chosen axis, we find that this observable is insensitive to (the recoil of) soft radiation. Furthermore, for small transverse momenta we show that the effects of the jet boundary factorize, leading to a new transverse-momentum-dependent (TMD) fragmentation function. In contrast to the usual TMD fragmentation functions, it does not involve rapidity divergences and is universal in the sense that it is independent of the type of process and number of jets. These results directly apply to sub-jets instead of hadrons. We discuss potential applications, which include studying nuclear modification effects in heavy-ion collisions and identifying boosted heavy resonances.


Jets QCD Phenomenology 


Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.


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Copyright information

© The Author(s) 2017

Authors and Affiliations

  1. 1.Theoretical Division, MS B283, Los Alamos National LaboratoryLos AlamosU.S.A.
  2. 2.Departamento de Física Teórica IIUniversidad Complutense de MadridMadridSpain
  3. 3.Institute for Theoretical Physics Amsterdam and Delta Institute for Theoretical PhysicsUniversity of AmsterdamAmsterdamThe Netherlands
  4. 4.Nikhef, Theory GroupAmsterdamThe Netherlands

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