May 17 – 22, 2021
US/Eastern timezone

NCQ scaling of $f_{0}(980)$ elliptic flow in 200 GeV Au+Au collisions by STAR and its constituent quark content

May 19, 2021, 9:50 AM
Room A (Zoom)

Room A


zoom co-host: Niveditha Ramasubramanian
Experimental talk Bulk (Transport)


Dr Jie Zhao (Purdue University)


Searching for exotic state particles and studying their properties have furthered our understanding of quantum chromodynamics (QCD). The $f_{0}(980)$ resonance is an exotic state with relatively higher production rate in relativistic heavy-ion collisions, decaying primarily into $\pi\pi$. Currently the structure and quark content of the $f_{0}(980)$ are unknown with several predictions from theory being a $q\bar{q}$ state, a $qq\bar{q}\bar{q}$ state, a $K\bar{K}$ molecule state, or a gluonium state. We report the first $f_{0}(980)$ elliptic flow ($v_{2}$) measurement from 200 GeV Au+Au collisions at STAR. The transverse momentum dependence of $v_{2}$ is examined and compared to those of other hadrons (baryons and mesons). The empirical number of constituent quark (NCQ) scaling is used to investigate the constituent quark content of $f_{0}(980)$ [1], which may potentially address an important question in QCD. We will report the findings of our investigation and discuss its implications.

[1] A. Gu, T. Edmonds, J. Zhao, F. Wang, Phys. Rev. C 101, 024908 (2020), arXiv:1902.07152

Collaboration STAR Collaboration

Presentation materials