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Physical Review D

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Particle multiplicity in jets and subjets with jet axis from color current

Wolfgang Ochs^*

Redamy Pérez Ramos^†

Max-Planck Institut für Physik, Werner-Heinsenberg-Institut, Föringer Ring 6, D-80805 München, Germany

II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany

^*wwo@mppmu.mpg.de
^†redamy@mail.desy.de

Phys. Rev. D 78, 034010 – Published 13 August, 2008

DOI: https://doi.org/10.1103/PhysRevD.78.034010

Abstract

We study the particle multiplicity in a jet or subjet as derived from an energy-multiplicity 2-particle correlation. This definition avoids the notion of a globally fixed jet axis and allows for the study of smaller jet cone openings in a more stable way. The results are sensitive to the mean color current $⟨ C ⟩_{A_{0}}$ in the jet from primary parton $A_{0}$ , which takes into account intermediate partonic processes in the subjet production where $C_{F} < ⟨ C ⟩_{A_{0}} < N_{c}$ at high energies. We generalize previous calculations in the leading logarithmic approximation (LLA). The size of the effects related to this jet axis definition is computed for multiplicities in subjets with different opening angles and energies by including contributions from the modified LLA and next-to-modified LLA to the leading order QCD results.

Article Text

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