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We study the particle multiplicity in a jet or sub-jet as derived from anenergy-multiplicity 2-particle correlation. This definition avoids the notionof a globally fixed jet axis and allows for the study of smaller jet coneopenings in a more stable way. The results are sensitive to the mean colorcurrent $<C >_{A_0} $ in the jet from primary parton $A_0$ which takes intoaccount intermediate partonic processes in the sub-jet production where $C_F< <C >_{A_0} < N_c$ at high energies. We generalize previous calculations inLeading Logarithmic Approximation (LLA). The size of the effects related tothis jet axis definition are computed for multiplicities in sub-jets withdifferent opening angles and energies by including contributions from theModified LLA (MLLA) and Next-to-MLLA to the leading order QCD results.

Particle Multiplicity in Jets and Sub-jets with Jet Axis from Color Current