N-jettiness for muon jet pairs in electroweak high-energy processes

Junegone Chay, Taehyun Kwon

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We study the N-jettiness in the electroweak high-energy process for the final muon jet pairs, ee+ → μ+ jet + μjet. Compared to QCD, the main difference is that there exist additional gauge nonsinglet contributions in the weak interaction, which make the factorization more elaborate. Especially the nonsinglet contributions arise due to the Block-Nordsieck violation in electroweak processes, which yields the Sudakov logarithms and the rapidity divergence. They change the evolution of the factorized parts considerably in the N-jettiness. There are two possible channels, initiated from the gauge bosons WW → ℓμℓ¯ μ, and from the electrons ℓeℓ¯ e → ℓμℓ¯ μ, where ℓ denotes the weak doublet. The latter was discussed previously, and we complete the analysis by studying the first. The factorization for WW → ℓμℓ¯ μ can be proceeded in a similar way as in the factorization for ℓeℓ¯ e → ℓμℓ¯ μ, and the result exhibits a rich structure. The new ingredients in this study consist of the W beam functions, and the complex color structure of the soft functions and the hard functions. The resummation of the large logarithms is performed by solving the renormalization group equations with respect to the renormalization scale and the rapidity scale. In the numerical analysis, we confine to the SU(2) weak gauge interaction, and the numerical results are presented for both channels at next-to-leading-logarithmic accuracy including the singlet and the nonsinglet contributions. The nonsinglet contributions turn out to be appreciable in the 2-jettiness.

Original languageEnglish
Article number91
JournalJournal of High Energy Physics
Issue number12
Publication statusPublished - 2022 Dec


  • Factorization
  • Higher Order Electroweak Calculations
  • Jets and Jet Substructure
  • Renormalization Group
  • Resummation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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