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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: https://jlab-org.zoomgov.com/j/1609930756?pwd=ueEK8URNt4sE0KVSkKnxYmfgoARBMJ.1</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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