Abstract: Study of jet fragmentation in p+p collisions at 200 GeV in the STAR experiment. E. Bruna (for the STAR Collaboration)

The measurement of jet fragmentation functions in p+p collisions at 200 GeV is of great interest because it provides a baseline to study jet quenching in heavy-ion collisions. It is expected that jet quenching in nuclear matter modifies the jet energy and multiplicity distributions, as well as the jet hadrochemical composition. Therefore, a systematic study of the fragmentation functions for charged hadrons and identified particles inside jets is a goal both in p+p and Au+Au collisions at RHIC. We present distributions of jet fragments in p+p collisions in STAR for different jet opening angles and energies, using a cone algorithm for the jet reconstruction. We also compare the results with the MLLA (modified leading logarithmic approximation) formalism which is known to provide a good description of fragmentation functions in e+e- and ppbar collisions at higher energies.