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<span style="font-size: 28pt; color: rgb(192, 0, 0); font-weight: 700; vertical-align: baseline; background-color: transparent;">Fall 2017 Colloquium</span></p>
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<span style="font-size: 16pt; font-weight: 700; vertical-align: baseline; background-color: transparent;">Department of Physics & Astronomy, TAMU-Commerce</span></p>
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<span style="font-size: 16pt; color: rgb(192, 0, 0); font-weight: 700; vertical-align: baseline; background-color: transparent;">Nov 2, Thursday, 4-5 PM in Science Building 127</span></p>
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<span style="font-size: 14pt; vertical-align: baseline; background-color: transparent;">(coffee and cookies will be served at 3:50 PM)</span></p>
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<span style="font-size: 18pt; color: rgb(0, 176, 80); font-weight: 700; vertical-align: baseline; background-color: transparent;">Particle Physics (Quantum Chromodynamics)</span></p>
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<span style="font-size: 18pt; color: rgb(0, 0, 255); font-weight: 700; vertical-align: baseline; background-color: transparent;">Lattice QCD investigations of quark transverse momentum in hadrons</span><span style="font-size: 18pt; color: rgb(0, 0, 255); font-weight: 700; vertical-align: baseline; background-color: transparent;"><br class="kix-line-break">
</span><span style="font-size: 14pt; font-weight: 700; vertical-align: baseline; background-color: transparent;">Dr. Michael Engelhardt</span></p>
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<span style="font-size: 14pt; font-weight: 700; vertical-align: baseline; background-color: transparent;">New Mexico State University
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<div style="text-align: center;"><img src="https://lh5.googleusercontent.com/Y-tSysnp5GIoasfh6ZUYSDpMjl88PGQZziBv00PnJbz1GgcP-zuX-fMIzTc35SaWnqAo30zU9WZa7aT5lbYWkAnfKj5bxEfKLDmDfLLTLaDaYlzezEgH0_iBPj72tYCpUfhI0fUq" width="150" height="200" originalwidth="150" originalheight="200" style="font-size: 11pt; border: none; transform: rotate(0rad); -webkit-transform: rotate(0rad);"></div>
<div style="text-align: left;"><span style="font-size: 12pt; line-height: 1.38; text-align: justify; text-indent: 36pt;">Dr. Engelhardt earned his doctorate degree in Physics at the University
</span><span style="font-size: 12pt; line-height: 1.38; text-align: justify; text-indent: 36pt;">of Erlangen, Germany, in 1994. His research topic was on Confinement and Thermodynamics in Quantum Chromodynamics (QCD) in 1+1 dimensions. He worked as a post-doc
at the Weizmann Institute in Israel, and at the University of Tuebingen in Germany, on diverse aspects of the strong interaction, most prominently the vortex picture of the QCD vacuum. In 2004, Dr. Engelhardt began his appointment as an assistant professor
at New Mexico State University, obtaining tenure in 2010. He is currently doing research in theoretical nuclear physics. More information of his research can be found at
</span></div>
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<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__physics.nmsu.edu_people_facstaff_MichaelEngelhardt.html&d=DwMFAw&c=oqyuZuih6ykib6aKiBq22_bich4AVfYGoLertJN0bEc&r=hjwEO_XYlnwAQWUGeaCrW47w4mK-Al28-BKyRvaivBs&m=8zV1omZSxVQT5rP_VryEixYmYFPIC2fOjnb0MGK68Gk&s=6ahSb85tsPw4CLCveA3xWa-87EfE7cMhTo1eCxUIrt8&e=" style="text-decoration:none;"><span style="font-size: 12pt; color: rgb(17, 85, 204); text-decoration: underline; vertical-align: baseline;">http://physics.nmsu.edu/people/facstaff/MichaelEngelhardt.html</span></a></p>
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<span style="font-size: 12pt; font-weight: 700; vertical-align: baseline; background-color: transparent;">Abstract</span></p>
<p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size: 12pt; vertical-align: baseline;">An ongoing program of evaluating transverse momentum-dependent (TMD) observables in hadrons within Lattice QCD is reviewed, summarizing
recent progress with respect to several challenges faced by such calculations. These lattice calculations are based on a definition of TMDs through hadronic matrix elements of quark bilocal operators, including an appropriate gauge connection between the quarks.
Results presented include data on the Sivers and Boer-Mulders effects, exhibiting the decisive role of the gauge connection in encoding information about the struck quark in a deep inelastic scattering process. Generalizing these TMD calculations by connecting
them with information about quark transverse position in the hadron allows one to access quark orbital angular momentum and provide a new perspective on the proton spin puzzle - the question of how the proton's spin arises from the spins and orbital angular
momenta of its constituents.</span></p>
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