Analysis of exclusive kT jet algorithms in electron-positron annihilation

Junegone Chay, Chul Kim, Inchol Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We study the factorization of the dijet cross section in e+e- annihilation using the generalized exclusive jet algorithm which includes the cone-type, the JADE, the kT, the anti-kT and the Cambridge/Aachen jet algorithms as special cases. In order to probe the characteristics of the jet algorithms in a unified way, we consider the generalized kT jet algorithm with an arbitrary weight of the energies, in which various types of the kT-type algorithms are included for specific values of the parameter. We show that the jet algorithm respects the factorization property for the parameter α<2. The factorized jet function and the soft function are well defined and infrared safe for all the jet algorithms except the kT algorithm. The kT algorithm (α=2) breaks the factorization since the jet and the soft functions are infrared divergent and are not defined for α=2, though the dijet cross section is infrared finite. In the jet algorithms which enable factorization, we give a phenomenological analysis using the resummed and the fixed-order results.

Original languageEnglish
Article number074019
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume92
Issue number7
DOIs
Publication statusPublished - 2015 Oct 13

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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