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<b><span style="font-size:48.0pt">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">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">University of Florida at Gainsville</span></b></span><o:p></o:p></p>
<p class="MsoNormal" align="center" style="text-align:center;text-autospace:none">
<span style="font-size:22.0pt">Compton photoproduction of axion-like, dark photon, dark scalar, and dark matter particles<i><o:p></o:p></i></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><i><span style="font-size:22.0pt"><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">Abstract:</span></b><span style="font-family:CMBX10"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:CMBX10"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:CMR10">We propose a novel way to search for the axion-like pseudo-scalar (</span><span style="font-family:CMMI10">a</span><span style="font-family:CMR10">), the dark photon (</span><span style="font-family:CMMI10">A</span><sup><span style="font-size:8.0pt;font-family:CMSY8">’</span></sup><span style="font-family:CMR10">),
the dark scalar (</span><span style="font-family:Symbol">f</span><span style="font-family:CMR10">), and the light dark matter (</span><span style="font-family:Symbol">c</span><span style="font-family:CMR10">) in the Compton process,
</span><span style="font-family:CMMI10"> </span><span style="font-family:CMR10"> </span><span style="font-family:Symbol">g</span><span style="font-family:CMR10"> + e<sup>-</sup>
</span><span style="font-family:Symbol">®</span><span style="font-family:CMR10"> </span>
<span style="font-family:CMSY10"> </span><span style="font-family:CMMI10">a/A<sup>’</sup>/</span><span style="font-family:Symbol">f</span><span style="font-family:CMMI10">
</span><span style="font-family:CMR10">+ </span><span style="font-family:CMMI10">e<sup>-</sup></span><span style="font-size:8.0pt;font-family:"Arial",sans-serif">
</span><span style="font-family:CMR10">with </span><span style="font-family:CMMI10">a/A</span><sup><span style="font-size:8.0pt;font-family:CMSY8">’</span></sup><span style="font-size:8.0pt;font-family:CMSY8">/</span><span style="font-size:8.0pt;font-family:Symbol">f</span><span style="font-family:CMMI10">
decaying</span><span style="font-family:CMR10"> into leptons, photons, or </span>
<span style="font-family:Symbol">c</span><span style="font-family:CMR10">'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@01D5071F.3C7BE1F0"></span><![endif]><span style="font-family:CMR10">
</span><span style="font-family:CMMI10">m</span><span style="font-size:8.0pt;font-family:CMMI8">A</span><span style="font-size:6.0pt;font-family:CMSY6">’/a/</span><span style="font-size:6.0pt;font-family:Symbol">f</span><span style="font-size:6.0pt;font-family:CMSY6">
</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@01D5071F.3C7BE1F0"></span><![endif]><span style="font-family:CMR10">0
MeV/</span><span style="font-family:CMMI10">c</span><sup><span style="font-size:8.0pt;font-family:CMR8">2
</span></sup><span style="font-family:CMR10">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@01D5071F.3C7BE1F0"></span><![endif]><span style="font-family:CMR10">
</span><span style="font-family:CMMI10">m</span><span style="font-size:8.0pt;font-family:Symbol">c</span><span style="font-family:CMSY10">
</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@01D5071F.3C7BE1F0"></span><![endif]><span style="font-family:CMR10">50
MeV/</span><span style="font-family:CMMI10">c</span><span style="font-size:8.0pt;font-family:CMR8">2</span><span style="font-family:CMR10">, 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 (</span><span style="font-family:CMMI10">g</span><span style="font-size:8.0pt;font-family:CMMI8">ae</span><span style="font-family:CMR10">),
the kinetic mixing (</span><span style="font-family:Symbol">e</span><span style="font-family:CMR10">) between the dark photon and the photon, and the dark scalar coupling to electron (</span><span style="font-family:CMMI10">y</span><span style="font-size:8.0pt;font-family:CMMI8">e</span><span style="font-family:CMR10">).</span><span style="font-family:CMR10"><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" 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"><o:p> </o:p></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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