STAR Flow, Chirality and Vorticity PWG

[Prithwish Tribedy <ptribedy AT rcf.rhic.bnl.gov>]

Dear Conveners,
  I would like to submit the following abstract for QM 2023. Here is a 
link:
https://drupal.star.bnl.gov/STAR/system/files/QM2023_abstract_Prithwish.pdf

The abstract is also included below for your convenience.

Title: Collectivity search in photonuclear interactions at RHIC

Abstract: We propose pushing the boundaries of RHIC small system scans 
by searching for collectivity in the interaction of a photon and an ion. 
Our aim is to continue down the hierarchy of system sizes He³+Au > d+Au 
> p+Au > γ+Au, to search for signatures of collectivity in the smallest possible size system at RHIC to date. We use RHIC Au+Au collisions at √sNN = 200 GeV from the 2019 running year to gain access to inclusive γ+Au process at 40 GeV center of mass energy. By triggering on the asymmetry of neutrons detected by ZDCs (1nXn) and activities in the Event-Plane detectors (EPDs), we trigger on γ+Au-rich events with nearly 99% purity. The combination of the STAR iTPC spanning -1.5 < η < 1.5 and EPDs spanning 2.1 < η < 5.1 provide the necessary acceptance to cover the mid-rapidity region (η) of the γ+Au systems and employ large Δη gaps in removing non-collective background. We present per trigger yield in relative azimuthal angle (Δφ), and the two-particle harmonic coefficient VnΔ(pT_trig, pT_assoc) with event activity (0 < Nch|η|<0.8 < 15). We compare our results from γ+Au processes expected to be near 40 GeV with the same from d+Au at √sNN = 39 GeV. We also compared our
results with the MUSIC hydrodynamic simulation with the 3D-Galuber initial 
state model and UrQMD afterburner model which simulates γ+Au interactions as 
ρ+Au. We will also present projections for the upcoming RHIC 2023-2025 runs. 
The observation of conclusive signatures of collectivity in the γ+Au 
interactions at RHIC would be an important step towards understanding the 
origin of collectivity and pave the way towards searching for many-body 
systems exhibiting collective behavior in photon-induced processes at the EIC.

Best,
Prithwish


On 2023-03-29 21:10, subhash via Star-fcv-l wrote:
> Dear All,
>
> As you may know April 3rd is the deadline to express interest within
> FCV PWG for submitting Quark Matter 2023 abstract. We would like to
> request you to send title and a brief abstract to FCV list. It would
> be helpful if you can create and post your title/abstract in a Drupal
> blog and send us the link. Thanks for your input.
>
> We will collect your contributions here:
> https://drupal.star.bnl.gov/STAR/blog/subhash/Intent-submit-QM2023-abstract-FCV
>
> With regards,
> Prithwish, Zhenyu and Subhash