Probing jet medium interaction with generalized projected energy correlators

Abstract

We study medium modifications to generalized projected energy correlators, referred to as $\nu$-correlators, measured on jets in heavy-ion collisions. While the vacuum distributions of these correlators exhibit a characteristic $1/\nu$ enhancement, we show that in a dense medium this behavior is regulated within both the BDMPS-Z and semi-classical approximations as $\nu \to 0$. As a result, contributions from medium-induced emissions become parametrically suppressed relative to the vacuum baseline. We observe a similar trend in the simulated events generated with JEWEL. We find that while the large angle enhancement is qualitatively similar across different values of $\nu$, the small angle distribution changes drastically between $\nu <1$ and $\nu >1$. This indicates that small angle modifications, primarily driven by jet energy loss, are imprinted differently across $\nu$-correlators. In particular, for $\nu <1$ the small angle enhancement is less prominent which suggests that these correlators may provide improved sensitivity to medium modifications in the large angle region.

Comments: 13 pages, 8 figures