From afreese at jlab.org Mon Dec 1 08:00:00 2025 From: afreese at jlab.org (Adam Freese) Date: Mon, 1 Dec 2025 13:00:00 +0000 Subject: [Theory-seminars] Theory seminar TODAY at 1 pm Message-ID: Greetings everyone, This is a reminder that we have an in-person seminar today at 1:00 PM. The seminar will be both in-person in CC F224-225 and broadcast over Zoom at the following link: https://jlab-org.zoomgov.com/j/1608569204?pwd=EI3L5PcXP8ncT4KbRvd1hrIuHAVFjf.1 Tomorrow's speaker is Zaki Panjsheeri from University of Virginia. Please find the title and abstract below. Title: Generalized parton distributions in the AI/ML era Abstract: The proton?s internal structure is a rich environment for the study of emergence in quantum chromodynamics. Generalized parton distributions (GPDs) give direct access to this environment. GPDs parameterize the components of quark and gluon angular momentum that enter the spin sum rules and, through Fourier transformation with respect to the transverse momentum transfer, provide spatial distributions of partons inside the proton. The extraction of GPDs from Compton form factors (CFFs), which themselves must be extracted from the cross sections and asymmetries of deeply virtual exclusive processes, poses a complicated inverse problem. In this seminar, to demonstrate the various properties of and constraints on GPDs, I will present a model of valence, sea, and gluon GPDs that offers predictions in the kinematics of Jefferson Lab and the upcoming Electron-Ion Collider. This lays the foundation for the work of the Exclusives in AI/ML (ExclAIm) collaboration in applying ML techniques to the extraction of GPDs from experimental data and ab initio lattice QCD results. I will discuss our physical interpretation of GPDs from LQCD calculations through symbolic regression, as well as our deep learning-based parameterization called Neural Network GPDs (NNGPD). We look forward to seeing you all there! Kind regards, Adam (on behalf of the organizing committee: Adam, Joe and Pia) -------------- next part -------------- An HTML attachment was scrubbed... URL: From jkarpie at jlab.org Mon Dec 1 15:17:15 2025 From: jkarpie at jlab.org (Joseph Karpie) Date: Mon, 1 Dec 2025 20:17:15 +0000 Subject: [Theory-seminars] Cake Seminar Wednesday Message-ID: Hey everyone, On Wednesday at 1pm in F326-327, we will have a cake seminar by Wally Melnitchouk. Title: "New JAM global QCD analysis of pion and kaon PDFs" Abstract I will review recent results from the JAM Collaboration on pion and kaon parton distribution functions (PDFs) obtained from global QCD analysis of experimental Drell-Yan and leading neutron electroproduction data, together with lattice QCD calculations of PDF moments and Ioffe time distributions. The analysis indicates a softer valence up-quark distribution in the K+ compared with the ?+, and provides the first empirical evidence for significantly different valence up and anti-strange densities in the kaon. Inclusion of recent lattice calculations of gluonic pseudo Ioffe-time distributions also significantly reduces uncertainties on the gluon PDF, revealing a higher gluon density in the pion at large momentum fractions than in the proton. -- Joe Karpie Pronouns: He/His/Him Postdoctoral Fellow Theoretical and Computational Physics Center Jefferson Lab -------------- next part -------------- An HTML attachment was scrubbed... URL: From jkarpie at jlab.org Tue Dec 2 12:10:34 2025 From: jkarpie at jlab.org (Joseph Karpie) Date: Tue, 2 Dec 2025 17:10:34 +0000 Subject: [Theory-seminars] Cake Seminar Wednesday In-Reply-To: References: Message-ID: Hey everyone, Tomorrow you can also join us on zoom at https://jlab-org.zoomgov.com/j/1616428979?pwd=f65lptqNGD9viHlDDNY2Uu6ATR9TPm.1 Since cake seminars are more internal and informal, we wanted to default to not having a call available to everyone on the mailing list. If you desire to call in for whatever reason, please reach out to us and we'll check with the speaker if they are ok with it. Best, Adam, Joe, and Pia ________________________________ From: Theory-seminars on behalf of Joseph Karpie via Theory-seminars Sent: Monday, December 1, 2025 3:17 PM To: Adam Freese via Theory-seminars Subject: [Theory-seminars] Cake Seminar Wednesday Hey everyone, On Wednesday at 1pm in F326-327, we will have a cake seminar by Wally Melnitchouk. Title: "New JAM global QCD analysis of pion and kaon PDFs" Abstract I will review recent results from the JAM Collaboration on pion and kaon parton distribution functions (PDFs) obtained from global QCD analysis of experimental Drell-Yan and leading neutron electroproduction data, together with lattice QCD calculations of PDF moments and Ioffe time distributions. The analysis indicates a softer valence up-quark distribution in the K+ compared with the ?+, and provides the first empirical evidence for significantly different valence up and anti-strange densities in the kaon. Inclusion of recent lattice calculations of gluonic pseudo Ioffe-time distributions also significantly reduces uncertainties on the gluon PDF, revealing a higher gluon density in the pion at large momentum fractions than in the proton. -- Joe Karpie Pronouns: He/His/Him Postdoctoral Fellow Theoretical and Computational Physics Center Jefferson Lab -------------- next part -------------- An HTML attachment was scrubbed... URL: From pialjp at jlab.org Mon Dec 8 09:51:01 2025 From: pialjp at jlab.org (Pia Jones Petrak) Date: Mon, 8 Dec 2025 09:51:01 -0500 Subject: [Theory-seminars] Theory Seminar TODAY Message-ID: <46b3180c-e69d-477b-ba98-025fdd7c5fd5@jlab.org> Hey everyone, We will be having a remote Theory seminar *today at 1pm*. Even though it's remote *please join us in L102 *or on Zoom. Below is the info* * Speaker: *Max Hansen* Zoom: https://jlab-org.zoomgov.com/j/1604596152?pwd=mibAQ8ziTyr1yrngbs2IIobuEyvuWn.1 Title:*Predicting three-hadron amplitudes from first-principles QCD* Abstract: I will review recent advances in studying three-particle interactions directly from lattice QCD. By employing mathematical relations that connect finite-volume energies and matrix elements to physical scattering and decay amplitudes, it is now possible to calculate observables that go beyond the single-hadron or elastic two-hadron regime. In addition to outlining the key formalism, I will highlight recent theoretical developments (e.g. for D D pi and N pi pi amplitudes) as well as recent applications (e.g. rho pi scattering with a rigorously resonant rho). I will also discuss future prospects and open challenges. Best wishes, Adam, Joe, and Pia -- Pia Leonie Jones Petrak Postdoctoral Fellow Theoretical and Computational Physics Center Jefferson Lab -------------- next part -------------- An HTML attachment was scrubbed... URL: