# Correlations with fluctuating strings

## TL;DR

This paper introduces a semi-analytic method to analyze forward-backward multiplicity correlations in high-energy nuclear collisions, accounting for string endpoint fluctuations, and applies it to Au+Au and d+Au collisions at 200 GeV.

## Contribution

It provides a generic approach to estimate fluctuation bounds using particle emission from fluctuating strings, validated with the wounded quark model.

## Key findings

- Bounds for fluctuation measures derived from rapidity spectra.
- Method applicable to independent source production models.
- Applied successfully to Au+Au and d+Au collision data.

## Abstract

We present a semi-analytic approach to forward-backward multiplicity correlations in ultra-relativistic nuclear collisions, based on particle emission from strings with fluctuating end-points. We show that with the constraints from rapidity spectra, one can obtain bounds for the magnitude of the standard measures of the forward-backward fluctuations. The method is generic under the assumption of independent production from sources. For definiteness, we use the wounded quark model for Au+Au and d+Au collisions at the energy of $\sqrt{s_{NN}}=200$ GeV.