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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">Subject:
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<td>Physics Colloquium - December 8, “Quantum interference
in hydrogen spectroscopy and the proton charge radius
puzzle"</td>
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">Date: </th>
<td>Mon, 4 Dec 2017 16:30:17 +0000</td>
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">From: </th>
<td>Wilkinson, Ellie V <a class="moz-txt-link-rfc2396E" href="mailto:evwilk@wm.edu"><evwilk@wm.edu></a></td>
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">To: </th>
<td><a class="moz-txt-link-abbreviated" href="mailto:physics2017@physics.wm.edu">physics2017@physics.wm.edu</a>
<a class="moz-txt-link-rfc2396E" href="mailto:physics2017@physics.wm.edu"><physics2017@physics.wm.edu></a></td>
</tr>
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">CC: </th>
<td><a class="moz-txt-link-abbreviated" href="mailto:undergrads2017@physics.wm.edu">undergrads2017@physics.wm.edu</a>
<a class="moz-txt-link-rfc2396E" href="mailto:undergrads2017@physics.wm.edu"><undergrads2017@physics.wm.edu></a></td>
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height="263" width="220"><!--[endif]--><b><u><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif">PHYSICS COLLOQUIUM</span></u></b><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif">Friday, December 8, 2017<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif">4:00 PM
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif">Small Hall, Room 111<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif">Marko Horbatsch
</span></b><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif">[Host: K. Griffioen]<b>
</b><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif">York University, Toronto, Canada<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"> Title of Talk: “Quantum interference
in hydrogen spectroscopy and the proton charge radius
puzzle”<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"> <b><u><o:p></o:p></u></b></span></p>
<p class="MsoNormal"><b><u><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"><o:p><span
style="text-decoration:none"> </span></o:p></span></u></b></p>
<p class="MsoNormal"><b><u><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"><o:p><span
style="text-decoration:none"> </span></o:p></span></u></b></p>
<p class="MsoNormal"><b><u><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"><o:p><span
style="text-decoration:none"> </span></o:p></span></u></b></p>
<p class="MsoNormal"><b><u><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif">Abstract:<o:p></o:p></span></u></b></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif">For some years now the size of the proton
charge radius has been in question. Atomic hydrogen
spectroscopy was thought to be consistent with elastic
electron-proton scattering determinations and yielding a
radius of about 0.88 fm. The CREMA collaboration produced a
2S-2P Lamb shift measurement in muonic hydrogen (and later
in muonic deuterium) from which the charge radius follows to
have a value of 0.841 fm. This questions the accuracy of e-p
scattering determinations of the charge radius.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif">I will describe a recent fluorescence
measurement from Garching (T. Haensch group, Science 2017)
in regular hydrogen for the 2S-4P intervals, which when
corrected for quantum interference yields a result that is
consistent with the muonic hydrogen determination of the
proton charge radius. The role of quantum interference in
spectroscopy is a phenomenon that is becoming more important
as the demand of determining the center of the resonance as
a tiny fraction of its width is attempted.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><i><span style="font-family:"Times New
Roman",serif">Cookies & Coffee will be served in
Small 122 at 3:30pm<o:p></o:p></span></i></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Times New
Roman",serif;color:black">******</span><span
style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:12.0pt;font-family:"Monotype
Corsiva";color:#1F497D">Eleonor V. Wilkinson</span></b><span
style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Georgia",serif;color:black">Administrative
& Office Specialist
</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Georgia",serif;color:black">The
College of William & Mary-Physics<br>
Small Hall, Room 123<br>
300 Ukrop Way<br>
Williamsburg, VA 23185</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Times New
Roman",serif;color:black">Telephone: 757-221-3503</span><span
style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Times New
Roman",serif;color:black">Fax: 757-221-3540</span><span
style="color:black"><o:p></o:p></span></p>
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