Recent progress on intrinsic charm

TL;DR

This paper reviews recent advances in understanding the intrinsic charm component of the nucleon, highlighting theoretical progress and emphasizing the need for experimental confirmation to resolve its contribution.

Contribution

It surveys recent theoretical developments constraining intrinsic charm and emphasizes the shift towards experimental efforts for definitive detection.

Findings

Progress in theoretical constraints on intrinsic charm

Enhanced understanding of intrinsic charm's role in the nucleon

Call for experimental measurements to confirm intrinsic charm presence

Abstract

Over the past $\sim\!\! 10$ years, the topic of the nucleon's nonperturbative or $\textit{intrinsic}$ charm (IC) content has enjoyed something of a renaissance, largely motivated by theoretical developments involving quark modelers and PDF fitters. In this talk I will briefly describe the importance of intrinsic charm to various issues in high-energy phenomenology, and survey recent progress in constraining its overall normalization and contribution to the momentum sum rule of the nucleon. I end with the conclusion that progress on the side of calculation has now placed the onus on experiment to unambiguously resolve the proton's intrinsic charm component.