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<b><span style="font-size:48.0pt;font-family:"Times New Roman",serif">Physics Seminar<o:p></o:p></span></b></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span class="value"><b><span style="font-size:22.0pt;font-family:"Times New Roman",serif">Igal Jaegle</span></b></span><span class="value"><span style="font-size:22.0pt"><o:p></o:p></span></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><span class="value"><b><span style="font-size:22.0pt;font-family:"Times New Roman",serif">University of Florida at Gainesville</span></b></span><o:p></o:p></p>
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<i><span style="font-size:22.0pt;font-family:"Times New Roman",serif">Compton photoproduction of axion-like, dark photon, dark scalar, and dark matter particles<o:p></o:p></span></i></p>
<p class="MsoNormal" align="center" style="text-align:center"><i><span style="font-size:22.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></i></p>
<p class="MsoNormal" align="center" style="text-align:center;text-autospace:none">
<b><span style="font-size:18.0pt;font-family:"Times New Roman",serif">Abstract:</span></b><span style="font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Times New Roman",serif">We propose a novel way to search for the axion-like pseudo-scalar (a), the dark photon (A</span><sup><span style="font-size:8.0pt;font-family:"Times New Roman",serif">’</span></sup><span style="font-family:"Times New Roman",serif">),
the dark scalar (</span><span style="font-family:Symbol">f</span><span style="font-family:"Times New Roman",serif">), and the light dark matter (</span><span style="font-family:Symbol">c</span><span style="font-family:"Times New Roman",serif">) in the Compton
process, </span><span style="font-family:Symbol">g</span><span style="font-family:"Times New Roman",serif"> + e<sup>-</sup>
</span><span style="font-family:Symbol">®</span><span style="font-family:"Times New Roman",serif"> a/A<sup>’</sup>/</span><span style="font-family:Symbol">f</span><span style="font-family:"Times New Roman",serif"> + e<sup>-</sup></span><span style="font-size:8.0pt;font-family:"Times New Roman",serif">
</span><span style="font-family:"Times New Roman",serif">with a/A</span><sup><span style="font-size:8.0pt;font-family:"Times New Roman",serif">’</span></sup><span style="font-size:8.0pt;font-family:"Times New Roman",serif">/</span><span style="font-size:8.0pt;font-family:Symbol">f</span><span style="font-family:"Times New Roman",serif">
decaying into leptons, photons, or </span><span style="font-family:Symbol">c</span><span style="font-family:"Times New Roman",serif">'s (when permitted) for the mass ranges of 1
</span><!--[if gte msEquation 12]><m:oMath><i><span style='font-family:"Cambria Math",serif'><m:r>≤</m:r></span></i></m:oMath><![endif]--><![if !msEquation]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;position:relative;top:2.5pt;mso-text-raise:-2.5pt;mso-fareast-language:EN-US"><img width="11" height="17" style="width:.1145in;height:.177in" id="_x0000_i1025" src="cid:image001.png@01D50719.DC648650"></span><![endif]><span style="font-family:"Times New Roman",serif">
</span><span style="font-family:"Times New Roman",serif">m</span><span style="font-size:8.0pt;font-family:"Times New Roman",serif">A</span><span style="font-size:6.0pt;font-family:"Times New Roman",serif">’/a/</span><span style="font-size:6.0pt;font-family:Symbol">f</span><span style="font-size:6.0pt;font-family:"Times New Roman",serif">
</span><!--[if gte msEquation 12]><m:oMath><i><span style='font-family:"Cambria Math",serif'><m:r>≤10</m:r></span></i></m:oMath><![endif]--><![if !msEquation]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;position:relative;top:2.5pt;mso-text-raise:-2.5pt;mso-fareast-language:EN-US"><img width="31" height="17" style="width:.3229in;height:.177in" id="_x0000_i1025" src="cid:image002.png@01D50719.DC648650"></span><![endif]><span style="font-family:"Times New Roman",serif">0
MeV/c</span><sup><span style="font-size:8.0pt;font-family:"Times New Roman",serif">2
</span></sup><span style="font-family:"Times New Roman",serif">and 0.5 </span><!--[if gte msEquation 12]><m:oMath><i><span style='font-family:"Cambria Math",serif'><m:r>≤</m:r></span></i></m:oMath><![endif]--><![if !msEquation]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;position:relative;top:2.5pt;mso-text-raise:-2.5pt;mso-fareast-language:EN-US"><img width="11" height="17" style="width:.1145in;height:.177in" id="_x0000_i1025" src="cid:image001.png@01D50719.DC648650"></span><![endif]><span style="font-family:"Times New Roman",serif">
m</span><span style="font-size:8.0pt;font-family:Symbol">c</span><span style="font-family:"Times New Roman",serif">
</span><!--[if gte msEquation 12]><m:oMath><i><span style='font-family:"Cambria Math",serif'><m:r>≤ </m:r></span></i></m:oMath><![endif]--><![if !msEquation]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;position:relative;top:2.5pt;mso-text-raise:-2.5pt;mso-fareast-language:EN-US"><img width="14" height="17" style="width:.1458in;height:.177in" id="_x0000_i1025" src="cid:image003.png@01D50719.DC648650"></span><![endif]><span style="font-family:"Times New Roman",serif">50
MeV/c</span><span style="font-size:8.0pt;font-family:"Times New Roman",serif">2</span><span style="font-family:"Times New Roman",serif">, respectively. We will review how past, current, and future experiments (beam-dump and fixed target using a lepton or photon
beam) can use this new production mechanism of dark particles. We will dis-cuss the expected sensitivities of these experiments on the axion-like pseudo-scalar coupling to electron (g</span><span style="font-size:8.0pt;font-family:"Times New Roman",serif">ae</span><span style="font-family:"Times New Roman",serif">),
the kinetic mixing (</span><span style="font-family:Symbol">e</span><span style="font-family:"Times New Roman",serif">) between the dark photon and the photon, and the dark scalar coupling to electron (y</span><span style="font-size:8.0pt;font-family:"Times New Roman",serif">e</span><span style="font-family:"Times New Roman",serif">).</span><span style="font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif"><o:p> </o:p></span></i></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:18.0pt;font-family:"Times New Roman",serif">Friday, May 17, 2019<o:p></o:p></span></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:18.0pt;font-family:"Times New Roman",serif">11:00am<o:p></o:p></span></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:18.0pt;font-family:"Times New Roman",serif">CEBAF Center Auditorium<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Stephanie Tysor<o:p></o:p></p>
<p class="MsoNormal">Thomas Jefferson National Accelerator Facility<o:p></o:p></p>
<p class="MsoNormal">Physics Division<o:p></o:p></p>
<p class="MsoNormal">Hall A Administrative Assistant<br>
(office)<a href="callto:757-269-6005"><span style="color:blue">757-269-6005</span></a> (fax)<a href="callto:757-269-5235"><span style="color:blue">757-269-5235</span></a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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