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Nuclear Seminar- Tristan Protzman (Lehigh University)- Path-length dependent jet modification at RHIC and prospects for EIC

August 19, 2025
2:00 pm - 3:00 pm
1136 Physics Research Building

Tristan Protzman

Lehigh University

Path-length dependent jet modification at RHIC and prospects for EIC

Location: 1136 Physics Research Building

 

Abstract: Partonic scatterings with large momentum transfer in nuclear collisions produce collimated sprays of hadrons, known as jets, which serve as useful probes of the properties of the QCD medium formed in these collisions.  In heavy-ion collisions at RHIC, their modification manifests in a loss of jet energy through collisional and radiative processes, known as jet quenching. The path-length dependence of these energy loss mechanisms can be studied using the initial geometry of semi-central collisions by comparing jet yields emitted in-plane versus out-of-plane.  The anisotropy is quantified in the second-order Fourier coefficient v_2^jet and is expected to be sensitive to the variations of the mean path length.  Measurements of v_2^jet for multiple jet resolution parameters in Ru+Ru and Zr+Zr collisions at \sqrt{s_{NN}}=200 GeV at STAR will be presented.  Understanding the magnitude and jet resolution dependence of v_2^jet can help constrain jet quenching models, advancing the goal of using jets as a tomographic probe of the medium.  In addition, jets will be a critical channel for understanding the properties of protons and ions in electron-ion collisions at EIC.  The differences between jet measurement methods in heavy-ion and electron-ion collisions will be discussed, as well as the progress of detector and software development to enable such measurements.