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<span><span class="x_x_ContentPasted0 x_ContentPasted0 ContentPasted0" style="font-size:11pt">D</span><span class="x_x_ContentPasted0 x_ContentPasted0"><span class="x_x_ContentPasted0 x_ContentPasted0 ContentPasted0" style="font-size: 11pt; color: black;">ear
All,</span></span></span><span style="font-size:11pt" class="ContentPasted0"> </span>
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</span><span class="x_x_ContentPasted0 x_ContentPasted0 ContentPasted0" style="font-size: 11pt; color: black;">Tomorrow, September 11th</span><span dir="auto"><span class="x_x_ContentPasted0 x_ContentPasted0 ContentPasted0" style="font-size: 11pt; color: black;">,
at 1PM (EDT), we will resume the Theory Center seminars with a virtual seminar given by
</span></span><span dir="auto" style="font-size:11pt" class="ContentPasted0">Christopher Kane</span><span dir="auto"><span class="x_x_ContentPasted0 x_ContentPasted0 ContentPasted0" style="font-size: 11pt; color: black;">
</span><span class="x_x_ContentPasted0 x_ContentPasted0 ContentPasted0" style="font-size: 11pt; color: black;">of University of Arizona on the unique Zoom for Government link:</span></span><span dir="auto"><span class="x_x_ContentPasted0 x_ContentPasted0" style="font-size: 12pt; line-height: 1.5; color: black;"><br class="ContentPasted0">
</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_x_ContentPasted0 x_ContentPasted0" style="font-size:12pt;line-height:1.5"><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="OWAb8fa4888-29d9-b837-5346-54435c7e5ee7" class="x_OWAAutoLink x_ContentPasted6 ContentPasted0"><span style="line-height:normal">https://jlab-org.zoomgov.com/j/1615562883?pwd=R2hDVzZzZEdybW5PVGppWmdENmdrUT09</span></a></span></span></span></span></div>
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<span class="x_x_ContentPasted0 ContentPasted1" style="font-size:12pt">Please see below for the details.</span></p>
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<b><u><span class="x_x_ContentPasted0" style="font-size:12pt"><span data-markjs="true" class="x_markpmr40sqz6 ContentPasted1" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="" style="font-size:11pt">Theory</span></span><span class="x_x_ContentPasted0 ContentPasted1">
</span><span class="x_x_ContentPasted0" style="font-size:12pt"><span data-markjs="true" class="x_markrd67w8byk ContentPasted1" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="" style="font-size:11pt">Seminar</span></span><span class="x_x_ContentPasted0 ContentPasted1">:</span></u></b></p>
<p style="font-family: Calibri, sans-serif; margin: 0px; background-color: white;">
<span class="x_x_ContentPasted0 ContentPasted1">Monday September 11</span><span><sup class="x_x_ContentPasted0 ContentPasted1">th</sup></span><span class="x_x_ContentPasted0 ContentPasted1">, 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_x_ContentPasted0 x_ContentPasted2 ContentPasted1">Speaker</span></u></b><span class="x_x_ContentPasted0 x_ContentPasted2 ContentPasted1">:</span></span><span><span class="x_x_ContentPasted0 x_ContentPasted2 ContentPasted1">
Christopher Kane (University of Arizona)</span></span></p>
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<span dir="auto"><span><b><u><span class="x_x_ContentPasted0 x_ContentPasted3 ContentPasted1">Title</span></u></b><span class="x_x_ContentPasted0 x_ContentPasted3 ContentPasted1">:
</span><span><span class="x_x_ContentPasted0 x_ContentPasted3 ContentPasted1">Methods for high-precision determinations of radiative-leptonic decay form factors using lattice QCD<br class="ContentPasted1">
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<span dir="auto"><span><span><span><b><u><span class="x_x_x_ContentPasted0 x_x_ContentPasted0 x_ContentPasted4 ContentPasted1">Abstract</span></u></b><span class="x_x_x_ContentPasted0 x_x_ContentPasted0 x_ContentPasted4 ContentPasted1">:
<span dir="auto"><span><span><span dir="auto"><span><span class="x_ContentPasted5 ContentPasted1">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><span class="ContentPasted1">
<p class="ContentPasted1"><br class="ContentPasted1">
See you all tomorrow!<br class="ContentPasted1">
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Best regards,<br class="ContentPasted1">
Caroline, Joe, Patrick & Zheng-Yang</p>
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