# Long-range Correlations in Massive Jets

## TL;DR

This paper investigates azimuthal anisotropy in two-jet systems with massive, off-shell jets, using a new fragmentation model to match low-multiplicity proton-proton collision data at 13 TeV.

## Contribution

It introduces a novel off-shell fragmentation model to analyze azimuthal anisotropy in massive, off-shell jets, extending previous approaches.

## Key findings

- Reproduces low-multiplicity $v_2$ data at 13 TeV.
- Shows how jet mass and multiplicity affect $v_2$ shape.
- Highlights importance of jet mass in azimuthal correlations.

## Abstract

We calculate the azimuthal anisotropy $v_2$ extracted from the large $\Delta y$ region of two particle $\Delta y-\Delta\phi$ correlations in a two-jet system, in which, the masses of the jets are not negligible compared to their energies. As the virtualities of the leading partons, initiating these jets are not negligible either, we use a recently developed, off-shell fragmentation model for the description of hadron production in the jets. We present the effect of the variation of jet mass and hadron multiplicity on the shape of the $v_2$ curve, and reproduce the low-multiplicity data set measured in proton-proton collisions at $\sqrt s = 13$ TeV.