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Hello All,</div>
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This coming Monday, March 21<span><sup>st</sup> </span>at 9am (EDT), Yiyu Zhou will give a (virtual) cake seminar on
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<span></span><span style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0);"><a href="https://jlab-org.zoomgov.com/j/1611179843?pwd=M09CNTFpbFVZSW1IQlhIMGp3RUVHUT09" target="_blank" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="0"><span style="font-family:Calibri, Helvetica, sans-serif, serif, EmojiFont">https://jlab-org.zoomgov.com/j/1611179843?pwd=M09CNTFpbFVZSW1IQlhIMGp3RUVHUT09</span></a></span></span><br>
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Please see below for the details.</div>
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<div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0);"><span style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0);"><b><span style="font-family:Calibri, Helvetica, sans-serif, serif, EmojiFont"><u>Cake Seminar</u></span></b></span>
<div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0);"><span style="font-family:Calibri, Helvetica, sans-serif, serif, EmojiFont">Monday, March 21st at
</span><span style="font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; background-color: rgb(255, 128, 0);">9:00AM</span><span style="font-family:Calibri, Helvetica, sans-serif, serif, EmojiFont"><br>
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<span class="x_x_x_x_x_field-content" style="font-family:Calibri, Helvetica, sans-serif, serif, EmojiFont"><u><b><span class="field-content"><strong>Yiyu Zhou</strong></span></b></u></span><span class="x_x_x_x_x_field-content" style="font-family:Calibri, Helvetica, sans-serif, serif, EmojiFont">
(</span><span class="x_x_x_x_x_field-content" style="font-family:Calibri, Helvetica, sans-serif, serif, EmojiFont"><span class="x_x_x_x_field-content"></span></span><span class="x_x_x_x_x_field-content" style="font-family:Calibri, Helvetica, sans-serif, serif, EmojiFont"><span class="field-content">South
China Normal University/UCLA</span>)</span></div>
<div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0);"><span class="x_x_x_x_x_field-content" style="font-family:Calibri, Helvetica, sans-serif, serif, EmojiFont">will address "How well do we know the gluon polarization in the proton?"</span><span class="x_x_x_x_x_field-content"><br>
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<span style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0);"><u><b><span style="font-family:Calibri, Helvetica, sans-serif, serif, EmojiFont">Abstract:</span></b></u><b><span style="font-family:Calibri, Helvetica, sans-serif, serif, EmojiFont"></span></b><span style="font-family:Calibri, Helvetica, sans-serif, serif, EmojiFont">
</span><span style="font-family:Calibri, Helvetica, sans-serif, serif, EmojiFont">We perform the first simultaneous global QCD analysis of spin-averaged and spin-dependent parton distribution functions (PDFs), including single jet production data from unpolarized
and polarized hadron collisions. We critically assess the impact of SU(3) flavor symmetry and PDF positivity assumptions on the quark and gluon helicity PDFs, and find strong bias from these, particularly on the gluon polarization. The simultaneous analysis
allows for the first time extraction of individual helicity-aligned and antialigned PDFs with a consistent treatment of uncertainties.</span><u><b><span style="font-family:Calibri, Helvetica, sans-serif, serif, EmojiFont"><br>
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Have a pleasant weekend!</div>
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Caroline, Colin, & Patrick<br>
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