Inclusive hadronic distributions in jets and sub-jets with jet axis from color current

Abstract

The hadronic $\text{kt}$-spectrum and the gluon to quark average multiplicity ratio $r=N_g/N_q$ inside a high energy sub-jet are determined from a precise definition of the jet axis, including corrections of relative magnitude $\mathcal{O}(\sqrt{{\alpha }_s})$ with respect to the Modified Leading Logarithmic Approximation (MLLA), in the limiting spectrum approximation (assuming an infrared cut-off $Q_0=\text{lqcd}$). The results for the $\text{kt}$-spectrum in the limiting spectrum approximation are found to be, after normalization, in impressive agreement with measurements by the CDF collaboration and the ratio has not been measured yet.

Comments: Invited lecture at Ringberg Workshop: New Trends in HERA Physics 2008, October 5-10, 2008, Ringberg Castle, Tegernsee-Bavaria, Germany