*Speaker : Prof. Chul Kim (Seoul National University of Science and Technology)
*Abstract : In this talk we consider fragmenting and splitting process to a jet, which is defined by a specific jet algorithm. Unlike hadron fragmentation function, Fragmenting function to a jet (FFJ) can be computed perturbatively without infrared divergences. However, resummation of large logarithms due to a small jet radius is indispensable. Resumming process turns out to be the same as RG evolution through DGLAP kernel. We also consider another large logarithms as an observed jet take most of energy from a mother parton. Resumming these large logarithms give significant corrections to the fragmenting process to a jet.