STAR Flow, Chirality and Vorticity PWG

[Jiangyong Jia <jiangyong.jia AT stonybrook.edu>]

Dear All,

If you have the abstract linked on the druple, please add a line to 
indicate whether it is for a talk or a poster.

Thanks,
Jiangyong


On 11/1/21 3:20 PM, Prithwish Tribedy via Star-fcv-l wrote:
> Dear FCV folks,
>  Here is an abstract on the first attempt to search for collectivity 
> in photonuclear events from STAR.
> Best,
> Prithwish
>
>
> Title: Search for collectivity in photon-nucleus collisions using 
> ultra-peripheral Au+Au collisions from STAR
> PAs: Nicole Lewis/Prithwish Tribedy
>
> The remaining years of RHIC running and analyses of already collected 
> data provide a unique opportunity to understand the origin of 
> collectivity in small collision systems. One possible way to address 
> this outstanding problem is to study colliding systems of various 
> sizes at RHIC. We propose a key addition to such an initiative and 
> propose the search for collectivity in inclusive photon-ion (γ+Au) 
> interactions. This will push the boundaries of the recent system size 
> scan at RHIC. The photonuclear γ+Au interactions occur in 
> ultra-peripheral collisions (UPC) of Au+Au for which the CGC 
> calculations predict a clean signature of long-range collectivity that 
> can also be explored in e+Au collisions at the Electron-Ion Collider 
> (EIC) [1]. This study will focus on the analysis of γ + Au 
> interactions using the Au+Au 54 GeV UPC dataset from STAR. The events 
> are triggered by requiring ZDC east (ZDCE) detector restricted to have 
> a single neutron hit, while no restriction is placed on the ZDC west 
> (ZDCW) for γ + Au candidates with east going photons, and vice versa. 
> The pseudorapidity distribution of particles is strongly asymmetric in 
> these interactions and the wide acceptance coverage of the STAR 
> detector using TPC, BBC and VPD is exploited to improve the purity of 
> the γ + Au-rich samples. We will present measurements on long-range 
> di-hadron correlations and harmonic anisotropy coefficients in high 
> activity γ + Au-rich events. In order to address non-flow effects we 
> use template subtraction method using correlation measurements from 
> low activity γ + Au events. We also compare peripheral Au+Au 
> collisions for baseline studies.
>
> [1] Y. Shi et al, e-Print: 2008.03569 [hep-ph]
>
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