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

[Pooyan Goodarzi]

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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