Measurement of Energy Correlators within jets in p+p Collisions at √s = 200 GeV in STAR

Advancements in jet-finding algorithms allow for detailed studies into parton showers, fragmentation, and hadronization governed by Quantum Chromodynamics. Recent theoretical efforts in describing intra-jet energy flow propose a new obervable, the N-point energy correlator. This observable recontextualizes jet substructure by providing insight into the perturbative structure of the jet as well as hadronization. From the two-point energy correlator as a function of opening angle, one can determine the crossover region where the scaling behavior of the correlator changes from a random distribution of hadrons at small opening angles to perturbative partons at large opening angles.

In this talk, first studies on the two-point energy correlator using STAR's p+p dataset taken at √s = 200 GeV will be presented. The correlation function is represented by the distribution of the opening angle in rapidity-azimuthal angle phase space between two constituents of a jet weighted by their energy product. Various selections on jet transverse momentum (p_T) as well as constituent p_T will be used to study how the transition region from partons to hadrons changes as a function of these variables. These measurements will be compared with PYTHIA to evaluate their susceptibility to detector effects.