Investigation of exotic state X(3872) in pp collisions at sqrt{s}=7, 13\xa0TeV

Hong-Ge Xu,Xiao-Lin Kang,Dai-Mei Zhou,Liang Zheng,Ben-Hao Sa,Gang Chen,Zhi-Lei She

doi:10.1140/epjc/s10052-021-09573-z

Abstract

We have used the dynamically constrained phase space coalescence model to study the production of the exotic state X(3872) based on the hadronic final states generated by the parton and hadron cascade model (PACIAE) with |y|<1 and p_T < 15.5 GeV/c in pp collisions at sqrt{s}=7 and 13 TeV, respectively. Here the X(3872) is assumed to consist of bound state Dbar{D^*}, which can form three possible structures for the tetraquark state, the nucleus-like state, and the molecular state. The yields of three different structures X(3872) were predicted. The transverse momentum distribution and the rapidity distribution of three different structures X(3872) are also presented. Sizable difference can be found in the transverse momentum and rapidity distributions for the three different X(3872) structures.

Highlights

The first exotic state X (3872) was discovered by the Belle collaboration almost two decades ago in the decay channel B± → k±π +π − J/ψ, with a significance of 10σ [2]
The comparison of the yields for each final states between the experimental measurement and the calculation from PACIAE model are shown in Table 1, which are consistent with each other within uncertainty
From D∗0 D 0 and D0 D ∗0 clusters are two orders of magnitude higher than the yields of D− D∗+ and D+ D∗− clusters. This indicates that the yield of X (3872) produced in pp collisions mainly comes from the D∗0 D 0 and D0 D ∗0 clusters

Summary

Introduction

The first exotic state X (3872) was discovered by the Belle collaboration almost two decades ago in the decay channel B± → k±π +π − J/ψ, with a significance of 10σ [2]. In this paper, taking X (3872) as an example, the parton and hadron cascade model (PACIAE) [26] plus the dynamically constrained phase space coalescence model (DCPC) [27,28,29] is proposed to simulate the complete evolution process from the initial state of the parton to the final state of the multiparticle in high-energy collisions. Based on this approach, we predict the yields and properties of the exotic hadron X (3872) and explore the production process and its structure of the exotic hadron X (3872) in highenergy pp collisions.

PACIAE model and DCPC model

Results

Conclusions