Global Polarization of the Lamba/Anti-Lambda System in the STAR BES
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The Ohio State University / OhioLINK
2018
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=osu152345697657853 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu1523456976578532021-08-03T07:06:04Z Global Polarization of the Lamba/Anti-Lambda System in the STAR BES Upsal, Isaac Physics Nuclear Physics Lambda hyperon global polarization polarization STAR RHIC BES vorticity vortical spin nuclear physics We present the global polarization of Lambda and Anti-Lambda hyperons in Au+Au collisions at √s = 7.682, 11.454, 14.546, 19.564, 26.994, and 38.996GeV. The global polarization is a measure of the alignment of final state particle spin with total collision system angular momentum, and is given as a percentage. Averaging over √s the values of the polarization for these particles is P(Lambda) = 1.08 ± 0.15(stat) ± 0.11(sys)% and P(Anti-Lambda) = 1.38 ± 0.30(stat) ± 0.13(sys)%. This represents the first non-trivial measurement of this type. The data was recorded by the STAR collaboration. Positive polarization represents positive vorticity in the fireball. We also present a method for extracting this vorticity from the data while accounting for polarized particle feed down. The extracted vorticity is ω = (9 ± 1) 10<sup>21</sup> s<sup>-1</sup> with a systematic scaling uncertainty of 2, primarily due to uncertainty in the temperature. Such a vorticity far exceeds any other known vorticity lending a new superlative to the QGP: “the most vortical fluid”. 2018-08-10 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu152345697657853 http://rave.ohiolink.edu/etdc/view?acc_num=osu152345697657853 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Physics Nuclear Physics Lambda hyperon global polarization polarization STAR RHIC BES vorticity vortical spin nuclear physics |
| spellingShingle |
Physics Nuclear Physics Lambda hyperon global polarization polarization STAR RHIC BES vorticity vortical spin nuclear physics Upsal, Isaac Global Polarization of the Lamba/Anti-Lambda System in the STAR BES |
| author |
Upsal, Isaac |
| author_facet |
Upsal, Isaac |
| author_sort |
Upsal, Isaac |
| title |
Global Polarization of the Lamba/Anti-Lambda System in the STAR BES |
| title_short |
Global Polarization of the Lamba/Anti-Lambda System in the STAR BES |
| title_full |
Global Polarization of the Lamba/Anti-Lambda System in the STAR BES |
| title_fullStr |
Global Polarization of the Lamba/Anti-Lambda System in the STAR BES |
| title_full_unstemmed |
Global Polarization of the Lamba/Anti-Lambda System in the STAR BES |
| title_sort |
global polarization of the lamba/anti-lambda system in the star bes |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
2018 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu152345697657853 |
| work_keys_str_mv |
AT upsalisaac globalpolarizationofthelambaantilambdasysteminthestarbes |
| _version_ |
1719453642893819904 |