Experimental measurement of medium response and hard-soft correlation

Massachusetts Institute of Technology, USA

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Published online: 17 April 2026

Abstract

The observation of jet energy loss, or 'quenching', as a result of jet-medium interactions has long been held as a fundamental signature of the hot- and-dense state of matter known as the quark-gluon plasma (QGP). Jet-medium interactions responsible for quenching should also induce perturbations in the QGP, termed medium response, and result in correlations between the hard and soft scales. In these proceedings, recent results sensitive to medium response, such as jet nuclear modification factors for a variety of radius parameters R, jet hadrochemistry measurements, and energy-energy correlator measurements, will be reviewed. In addition, the search for direct evidence of medium response in boson-jet-track correlations will be discussed.