[Prex] [EXTERNAL] Ask for comments: abstract for APS April meeting

[Weibin Zhang]

Good morning, everyone:

Here is my abstract for APS April meeting, please take a look and comment
on it, thank you.

The Transverse Asymmetry (AT) as measured by PREX-II and CREX is defined as
the asymmetry of electron scattering cross section between opposite
transverse polarities against an unpolarized target. It arises from the
higher order EM interaction (the interference between One Photon Exchange
(OPE) and Two Photon Exchange (TPE)), giving it a small magnitude. The
PREX-II and CREX experiments provide us a unique opportunity to investigate
the underlying physics of TPE. Moreover, the measurements in PREX-II and
CREX bring precision  beyond HAPPEX and PREX-I, leading to possible
new understanding
of relationship between AT and A/Z-scaling of different nuclei. Lastly, AT
itself is a systematic uncertainty in the PREX-II/CREX data; by measuring
it precisely, we will improve the PREX-II and CREX results. In this
presentation, I will report the analysis and result of the new AT
data collected during 2019-2020 operation of
 PREX-II/CREX and their implications.


Best wishes,
Weibin
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