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<div class="moz-cite-prefix">On 21-09-2025 13:57, Joseph Karpie via
Theory-seminars wrote:<br>
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<blockquote type="cite" cite="mid:MW4PR09MB932911762EA73737395DF613C513A@MW4PR09MB9329.namprd09.prod.outlook.com">
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Hey everyone,</div>
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We will be having a remote Theory seminar Monday at 1pm. Even
though it's remote please join us in L102 or on Zoom. Below is
the info</div>
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Speaker: Joshua Miller (Temple U)</div>
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Zoom:
<a class="moz-txt-link-freetext" href="https://jlab-org.zoomgov.com/j/1609930756?pwd=ueEK8URNt4sE0KVSkKnxYmfgoARBMJ.1">https://jlab-org.zoomgov.com/j/1609930756?pwd=ueEK8URNt4sE0KVSkKnxYmfgoARBMJ.1</a></div>
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Title: Proton GPDs from Lattice QCD</div>
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Abstract: Understanding the internal structure of the proton
remains one of the central challenges in nuclear physics.
Lattice QCD provides a first-principles framework for accessing
partonic distribution functions that characterize parton
dynamics within the proton. Among these, generalized parton
distributions (GPDs) play a key role, as they provide a unified
description of both the longitudinal momentum and spatial
structure of quarks and gluons, thereby, along with the
transverse momentum–dependent distributions (TMDs), enable a
three-dimensional picture of the proton. Extracting the
x-dependence of GPDs rely on off-forward matrix elements of
non-local operators, which, traditionally, were performed in the
symmetric frame. In such a setup, the momentum transfer is
evenly shared between the initial and final hadron states. A
novel approach introduced in 2022 instead employs any frame,
allowing these matrix elements to be expressed in terms of
Lorentz-invariant amplitudes, which can then be systematically
mapped onto GPDs. This methodology has now been implemented for
the unpolarized, helicity, and transversity GPDs. The
proof-of-concept calculations we will present employ a proton
boost of P_3 = 1.25 GeV, with the x-dependence extracted via
Large Momentum Effective Theory (LaMET). Results are presented
at zero skewness using an N_f =2+1+1 ensemble of maximally
twisted mass fermions with clover improvement, corresponding to
a pion mass of about 260 MeV.</div>
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<span style="background-color: rgb(255, 255, 255);">--</span></div>
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Joe Karpie</div>
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Pronouns: He/His/Him</div>
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Postdoctoral Fellow</div>
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Theoretical and Computational Physics Center</div>
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Jefferson Lab</div>
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<pre wrap="" class="moz-quote-pre">_______________________________________________
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<pre class="moz-signature" cols="72">--
Pia Leonie Jones Petrak
Postdoctoral Fellow
Theoretical and Computational Physics Center
Jefferson Lab</pre>
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