Multiplicity fluctuation and correlation of identified baryons in quark combination model

TL;DR

This paper systematically studies the fluctuations and correlations of identified baryons produced from quark hadronization using the quark combination model, revealing universal features and effects of quark number fluctuations.

Contribution

It introduces a detailed analysis of baryon multiplicity fluctuations and correlations within the quark combination model, including effects of quark number fluctuations and resonance decays.

Findings

Multiplicity moments exhibit binomial behavior.

Universal baryon-antibaryon correlations are identified.

Quark number fluctuations influence baryon production patterns.

Abstract

The dynamical fluctuation and correlation of multiplicity distributions of identified baryons and antibaryons produced by the hadronization of the bulk quark system are systematically studied in quark combination model. Starting from the most basic dynamics of quark combination which are necessary for multiplicity study, we analyze moments (variance, skewness and kurtosis) of inclusive multiplicity distribution of identified baryons, two-baryon multiplicity correlations, and baryon-antibaryon multiplicity correlations after the hadronization of quark system with given quark number and antiquark number. We obtain a series of interesting findings, e.g., binomial behavior of multiplicity moments, coincide flavor dependent two-baryon correlation and universal baryon-antibaryon correlation, which can be regarded as general features of quark combination. We further take into account correlations and fluctuations of quark numbers before hadronization to study their influence on multiple production of baryons and antibaryons. We find that quark number fluctuation and flavor conservation lead to a series of important results such as the negative $p\bar{\Omega}^{+}$ multiplicity correlation and universal two-baryon correlations. We also study the influence of resonance decay in order to compare our results with future experimental data in ultra-relativistic heavy ion collisions at LHC.