<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div><p style="text-align: center; border: medium none; padding: 0in; margin: 0px;" data-mce-style="text-align: center; padding: 0in; margin: 0px;"><strong><span style="font-size: 48.0pt; line-height: 107%; font-family: 'Times New Roman',serif;" data-mce-style="font-size: 48.0pt; line-height: 107%; font-family: 'Times New Roman',serif;">Physics Seminar</span></strong></p><p style="text-align: center; margin: 0px;" data-mce-style="text-align: center; margin: 0px;"><strong><span style="font-size: 20.0pt; font-family: 'Times New Roman',serif;" data-mce-style="font-size: 20.0pt; font-family: 'Times New Roman',serif;">Gil Paz</span></strong></p><p style="text-align: center; margin: 0px;" data-mce-style="text-align: center; margin: 0px;"><strong><span style="font-size: 20.0pt; font-family: 'Times New Roman',serif;" data-mce-style="font-size: 20.0pt; font-family: 'Times New Roman',serif;">Wayne State University</span></strong></p><p style="margin: 0px;" data-mce-style="margin: 0px;"> </p><p style="text-align: center; margin: 0px;" data-mce-style="text-align: center; margin: 0px;"><em><span style="font-size: 18.0pt; font-family: 'Times New Roman',serif;" data-mce-style="font-size: 18.0pt; font-family: 'Times New Roman',serif;">The Proton Radius Puzzle</span></em></p><p style="margin: 0px; line-height: normal;" data-mce-style="margin: 0px; line-height: normal;"><span style="font-size: 9.0pt; font-family: CMBX9;" data-mce-style="font-size: 9.0pt; font-family: CMBX9;"> </span></p><p style="margin: 0px; line-height: normal;" data-mce-style="margin: 0px; line-height: normal;"><span style="font-size: 9.0pt; font-family: CMBX9;" data-mce-style="font-size: 9.0pt; font-family: CMBX9;"> </span></p><p style="margin: 0px; text-align: center; line-height: normal;" data-mce-style="margin: 0px; text-align: center; line-height: normal;"><strong><span style="font-size: 18.0pt; font-family: 'Times New Roman',serif;" data-mce-style="font-size: 18.0pt; font-family: 'Times New Roman',serif;">Abstract:</span></strong></p><p style="margin: 0px; text-align: center; line-height: normal;" data-mce-style="margin: 0px; text-align: center; line-height: normal;"><br> <br> <em><span style="font-size: 12.0pt;" data-mce-style="font-size: 12.0pt;">In 2010 the proton charge radius was extracted for the first time from muonic hydrogen, <br> a bound state of a muon and a proton. The value obtained was five standard deviations away <br> from the regular hydrogen extraction. Taken at face value, this might be an indication of a <br> new force in nature coupling to muons, but not to electrons. It also forces us to reexamine <br> our understanding of the structure of the proton.<br> <br> In this talk I will describe an ongoing theoretical research effort that seeks to address and <br> resolve this "proton radius puzzle". In particular, I will present a reevaluation of the proton <br> structure effects, correcting 40 years of such calculations, and the development of new effective <br> field theoretical tools that would allow to directly connect muonic hydrogen and muon-proton <br> scattering.</span></em><span style="font-size: 12.0pt;" data-mce-style="font-size: 12.0pt;"><br> <br> <br> </span></p><p style="text-align: center; margin: 0px;" data-mce-style="text-align: center; margin: 0px;"><strong><span style="font-size: 20.0pt; line-height: 107%; font-family: 'Times New Roman',serif;" data-mce-style="font-size: 20.0pt; line-height: 107%; font-family: 'Times New Roman',serif;">Friday, March 23, 2018</span></strong></p><p style="text-align: center; margin: 0px;" data-mce-style="text-align: center; margin: 0px;"><strong><span style="font-size: 20.0pt; line-height: 107%; font-family: 'Times New Roman',serif;" data-mce-style="font-size: 20.0pt; line-height: 107%; font-family: 'Times New Roman',serif;">11:00am</span></strong></p><p style="text-align: center; margin: 0px;" data-mce-style="text-align: center; margin: 0px;"><strong><span style="font-size: 20.0pt; line-height: 107%; font-family: 'Times New Roman',serif;" data-mce-style="font-size: 20.0pt; line-height: 107%; font-family: 'Times New Roman',serif;">CEBAF Auditorium</span></strong></p><p style="text-align: center; margin: 0px;" data-mce-style="text-align: center; margin: 0px;"><br> <br></p><p style="margin: 0px;" data-mce-style="margin: 0px;">Upcoming Seminar Speakers<br> -------------------------<br> <br> <span><span>April 20th</span></span>: J.-C. Peng<br> <span><span>April 27th</span></span>: Camillo Mariani<br> <span><span>June 1st</span></span>: Craig Roberts</p></div><div><br></div><div data-marker="__SIG_POST__">-- <br></div><div>Stephanie Tysor<br>Hall A Administrative Assistant<br>Thomas Jefferson National Accelerator Facility<br>(office)757-269-6005 (fax)757-269-5235</div></div></body></html>