Observation of a "Ridge" correlation structure in high multiplicity proton-proton collisions: A brief review

TL;DR

This paper reviews the discovery of a ridge-like correlation in high multiplicity proton-proton collisions at the LHC, summarizing experimental findings, theoretical interpretations, and future research directions.

Contribution

It provides a comprehensive overview of the experimental observation and theoretical understanding of the ridge phenomenon in proton-proton collisions.

Findings

Observation of ridge-like correlation in high multiplicity events

Summary of experimental and theoretical progress

Discussion of future research directions

Abstract

This paper briefly reviews the striking experimental observation of a ridge-like dihadron correlation structure in high multiplicity proton-proton collisions at the Large Hadron Collider (LHC). Recent progress of both experimental and theoretical efforts on understanding the physical origin of the novel effect is reviewed. Outlook on future direction of possible new studies is discussed.