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<span><span class="x_ContentPasted0 ContentPasted0" style="font-size: 11pt;">D</span><span class="x_ContentPasted0 ContentPasted0"><span class="x_ContentPasted0 ContentPasted0" style="font-size: 11pt; line-height: normal; color: black;">ear All,</span></span></span><span style="font-size: 11pt;">
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<div dir="auto"><span class="x_ContentPasted0 ContentPasted0" style="font-size: 11pt; line-height: normal; color: black;"> </span><span class="x_ContentPasted0 ContentPasted0" style="font-size: 12pt; line-height: 1.5; color: black;"><br>
</span><span class="x_ContentPasted0 ContentPasted0" style="font-size: 11pt; line-height: normal; color: black;">On Monday, September 11th</span><span dir="auto"><span class="x_ContentPasted0 ContentPasted0" style="font-size: 11pt; line-height: normal; color: black;">,
we will resume the Theory Center seminars with a virtual seminar given by </span>
</span><span dir="auto" style="font-size: 11pt;">Christopher Kane</span><span dir="auto"><span class="x_ContentPasted0 ContentPasted0" style="font-size: 11pt; line-height: normal; color: black;">
</span><span class="x_ContentPasted0 ContentPasted0" style="font-size: 11pt; line-height: normal; color: black;">of University of Arizona on the unique Zoom for Government link:</span></span><span dir="auto"><span class="x_ContentPasted0 ContentPasted0" style="font-size: 12pt; line-height: 1.5; color: black;"><br>
</span></span><span dir="auto"><span style="font-size: 11pt; color: black;"><span>
<div style="margin-top: 0px; margin-bottom: 0px;"><span dir="auto"><span class="x_ContentPasted0 ContentPasted0" style="font-size: 12pt; line-height: 1.5; color: black;"><span style="font-size:11pt"><span><a href="https://jlab-org.zoomgov.com/j/1615562883?pwd=R2hDVzZzZEdybW5PVGppWmdENmdrUT09" target="_blank" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="0" id="OWAe7abc356-e71d-7272-42ad-eb6a4a63efbe" class="OWAAutoLink ContentPasted6"><span style="font-size: 11pt; line-height: normal;">https://jlab-org.zoomgov.com/j/1615562883?pwd=R2hDVzZzZEdybW5PVGppWmdENmdrUT09</span></a></span></span></span></span><br>
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<span class="x_ContentPasted0" style="font-size: 12pt; color: black;">Please see below for the details.</span></p>
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<span class="x_ContentPasted0" style="color: black;"> </span></p>
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<b><u><span class="x_ContentPasted0" style="font-size: 12pt; color: black;"><span data-markjs="true" class="markpmr40sqz6" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="" style="font-size: 11pt;">Theory</span></span><span class="x_ContentPasted0" style="font-size: 11pt; color: black;">
</span><span class="x_ContentPasted0" style="font-size: 12pt; color: black;"><span data-markjs="true" class="markrd67w8byk" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="" style="font-size: 11pt;">Seminar</span></span><span class="x_ContentPasted0" style="font-size: 11pt; color: black;">:</span></u></b></p>
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<span class="x_ContentPasted0" style="font-size: 11pt; color: black;">Monday September 11</span><span style="font-size: 11pt; color: black;"><sup class="x_ContentPasted0">th</sup></span><span class="x_ContentPasted0" style="font-size: 11pt; color: black;">,
1pm EDT (virtual)</span></p>
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<p style="margin-top: 0px; margin-bottom: 0px; background-color: white;"><span><b><u><span class="x_ContentPasted0 ContentPasted2" style="color: black;">Speaker</span></u></b><span class="x_ContentPasted0 ContentPasted2" style="color: black;">:</span></span><span><span class="x_ContentPasted0 ContentPasted2" style="color: black;">
Christopher Kane (University of Arizona)</span></span></p>
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<span dir="auto"><span><b><u><span class="x_ContentPasted0 ContentPasted3" style="color: black;">Title</span></u></b><span class="x_ContentPasted0 ContentPasted3" style="color: black;">:
</span><span style="color: black;"><span class="x_ContentPasted0 ContentPasted3">Methods for high-precision determinations of radiative-leptonic decay form factors using lattice QCD<br>
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<span dir="auto"><span><span style="color: black;"><span><b><u><span class="x_x_ContentPasted0 x_ContentPasted0 ContentPasted4">Abstract</span></u></b><span class="x_x_ContentPasted0 x_ContentPasted0 ContentPasted4">:
<span dir="auto"><span style="font-size: 11pt; color: black;"><span><span dir="auto"><span><span class="ContentPasted5">In the region of hard photon energies, radiative leptonic decays of pseudoscalar mesons represent important probes of the internal structure
of hadrons. Such decays are particularly interesting for heavy mesons, where currently only model-dependent calculations have been performed. Moreover, radiative decays can provide independent determinations of Cabibbo-Koboyashi-Maskawa matrix elements with
respect to purely leptonic or semileptonic channels. In this talk, I present a study of lattice-QCD methods to determine the relevant hadronic form factors for radiative leptonic decays of pseudoscalar mesons. In particular, I discuss how to best control two
sources of systematic error inherent in the calculation, specifically the unwanted excited states created by the meson interpolating field, and unwanted exponentials in the sum over intermediate states. From there, I describe a number of improvements, including
the use of an infinite-volume approximation method which allows us to perform calculations over the entire allowed range of photon energies. Using our improved methods, I present in progress results for the structure-dependent form factors describing the $D_s
\to \ell \nu_\ell \gamma$ process, using a domain-wall action for all quark flavors.</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span dir="auto"><span style="font-size: 11pt; color: black;"><span>
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See you all on Monday!<br>
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Best regards,<br>
Caroline, Joe, Patrick & Zheng-Yang<br>
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