[Physics-grads-open] PASS talk on Nuclear Physics

[Pooyan Goodarzi]

Reminder: happenings now.

On Sun, Mar 9, 2025 at 18:12 Pooyan Goodarzi <pooyan.goodarzi at email.ucr.edu>
wrote:

> Hi all,
>
> We will have our next PASS talk tomorrow by David. Please join us
> at noon (from 12:00 pm to 1:00 pm) in the Nebula Room (PHYS 3027).
>
>
> *David Kapukchyan**, PhD student*
> Monday, 12:00 pm, Nebula Room (PHYS 3027)
> *Measurement of the transverse single spin asymmetry in π0 production in
> polarized proton proton collisions*
>
> The Transverse Single Spin Asymmetry (TSSA) in polarized proton proton
> collisions has proved to be a valuable tool in understanding the internal
> structure of the proton. Specifically, to understand the origin of the
> proton’s spin. Initially, it was thought that the three quarks that make up
> the proton solely contribute to the proton’s spin. However, experiments
> showed that the spin contribution of the quarks is insufficient to account
> for the total spin. Current theories posit that the quarks and gluons
> (partons) inside a proton carry transverse momentum that is coupled to the
> proton’s spin which affects the production of the particles generated with
> respect to the polarization. The TSSA measures this asymmetry of particle
> production for a proton whose spin is polarized transverse to its momentum.
> The measurement of the TSSA provides input into those theoretical models to
> understand the different contributions of the quarksand gluons to the
> overall spin. To measure the π0 TSSA, polarized beams of protons are
> generated at the Relativistic Heavy Ion Collider (RHIC). The detector at
> RHIC utilized in this presentation is the Solenoidal Tracker At RHIC (STAR)
> and a major part of this work was building, installing, and commissioning
> an upgrade to the STAR detector system. The upgrade expanded STAR’stracking
> and calorimetry capability for 2.5<pseudorapidity(η)<4.0. This presentation
> will describe the calorimeter upgrade as well as the measurement of the π0
> TSSA as a function of Feynman-x (xF ).
>
> If you’re interested in sharing your work as a speaker, please feel free
> to add your name to this spreadsheet [Google Sheet
> <https://docs.google.com/spreadsheets/d/1N3ncf43jdB6aHYHhyWmyHMycxDg4_phHZXLkQvviO0o/edit?usp=sharing>
> ].
>
>
> Best,
> Pooyan
> Physics and Astronomy Student Seminar (PASS)
> https://ucrpass.arxiv.social
>
>
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