May 17 – 22, 2021
US/Eastern timezone

Deciphering the nature of X(3872) in heavy ion collisions

May 18, 2021, 10:30 AM
20m
Room D (Zoom)

Room D

Zoom

zoom co-host: Mriganka Mouli Mondal https://stonybrook.zoom.us/j/93238724142
Theory talk Charm Exotics

Speaker

Dr Hui Zhang (Institute of Quantum Matter, South China Normal University)

Description

Exploring the nature of exotic multiquark candidates such as the X(3872) plays a pivotal role in understanding quantum chromodynamics (QCD). Despite significant efforts, consensus on their internal structures is still lacking. As a prime example, it remains a pressing open question to decipher the X(3872) state between two popular exotic configurations: a loose hadronic molecule or a compact tetraquark. We demonstrate a novel approach to help address this problem by studying the X(3872) production in heavy ion collisions, where a hot fireball with ample light as well as charm (anti-)quarks is available for producing the exotics. Adopting a multiphase transport model (AMPT) for describing such collisions and implementing appropriate production mechanism of either molecule or tetraquark picture, we compute and compare a series of observables for X(3872) in Pb-Pb collisions at the Large Hadron Collider. We find the fireball volume plays a crucial role, leading to a 2-order-of-magnitude difference in the X(3872) yield and a markedly different centrality dependence between hadronic molecules and compact tetraquarks, thus offering a unique opportunity for distinguishing the two scenarios. We also make the first prediction of X(3872) elliptic flow coefficient to be tested by future experimental measurements.

Primary author

Dr Hui Zhang (Institute of Quantum Matter, South China Normal University)

Co-authors

Jinfeng Liao (Indiana University) Enke Wang (Institute of Quantum Matter, South China Normal University) Dr Qian Wang (Institute of Quantum Matter, South China Normal University) Hongxi Xing (Institute of Quantum Matter, South China Normal University)

Presentation materials