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DOE OSTI · 2998027

Exploring baryon resonances with transition generalized parton distributions: status and perspectives

Diehl, S. [Justus Liebig Universität Gießen (Germany); University of Connecticut, Storrs, CT (United States)] (ORCID:0000000199652874)·Joo, K. [University of Connecticut, Storrs, CT (United States)] (ORCID:0000000252656867)·Semenov-Tian-Shansky, K. [Kyungpook National University, Daegu (Korea); NRC “Kurchatov Institute”-PNPI, Gatchina (Russia)] (ORCID:0000000181590900)·Weiss, C. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)] (ORCID:0000000302965802)·Braun, V. [Universität Regensburg (Germany)]·Chang, W. C. [Academia Sinica, Taipei (Taiwan)]·Chatagnon, P. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)]·Constantinou, M. [Temple University, Philadelphia, PA (United States)]·Guo, Y. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)]·Hutauruk, P. T. P. [Pukyong National University (PKNU), Busan (Korea)]·Jo, H. S. [Kyungpook National University, Daegu (Korea)]·Kim, A. [University of Connecticut, Storrs, CT (United States)]·Kim, J. -Y. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)]·Kroll, P. [University of Wuppertal (Germany)]·Kumano, S. [Japan Women’s University, Tokyo (Japan); Institute of Particle and Nuclear Studies, KEK, Ibaraki (Japan)]·Lee, C. -H. [Pusan National University, Busan (Korea); POSTECH, Pohang (Korea)]·Liuti, S. [University of Virginia, Charlottesville, VA (United States)]·McNulty, R. [University College Dublin (Ireland)]·Son, H. -D. [Inha University, Incheon (Korea)]·Sznajder, P. [National Centre for Nuclear Research (NCBJ), Warsaw (Poland)]·Usman, A. [University of Regina (Canada)]·Van Hulse, C. [Universidad de Alcalá, Alcalá de Henares (Spain)]·Vanderhaeghen, M. [Johannes Gutenberg Universität, Mainz (Germany)]·Winn, M. [CEA Saclay, Gif sur Yvette (France)]
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Abstract

QCD gives rise to a rich spectrum of excited baryon states. Understanding their internal structure is important for many areas of nuclear physics, such as nuclear forces, dense matter, and neutrino-nucleus interactions. Generalized parton distributions (GPDs) are an established tool for characterizing the QCD structure of the ground-state nucleon. They are used to create 3D tomographic images of the quark/gluon structure and quantify the mechanical properties such as the distribution of mass, angular momentum, and forces in the system. Transition GPDs extend these concepts to N → N* transitions and can be used to characterize the 3D structure and mechanical properties of baryon resonances. They can be probed in high-momentum-transfer exclusive electroproduction processes with resonance transitions e + N → e' + M + N*, such as deeply-virtual Compton scattering (M = γ) or meson production (M = π, K, etc.), and in related photon/hadron-induced processes. This White Paper describes a research program aiming to explore baryon resonance structure with transition GPDs. This includes the properties and interpretation of the transition GPDs, theoretical methods for structures and processes, first experimental results from JLab 12 GeV, future measurements with existing and planned facilities (JLab detector and energy upgrades, COMPASS/AMBER, EIC, EicC, J-PARC, LHC ultraperipheral collisions), and the theoretical and experimental developments needed to realize this program.

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Diehl, S. [Justus Liebig Universität Gießen (Germany); University of Connecticut, Storrs, CT (United States)] (ORCID:0000000199652874), Joo, K. [University of Connecticut, Storrs, CT (United States)] (ORCID:0000000252656867), Semenov-Tian-Shansky, K. [Kyungpook National University, Daegu (Korea); NRC “Kurchatov Institute”-PNPI, Gatchina (Russia)] (ORCID:0000000181590900), Weiss, C. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)] (ORCID:0000000302965802), Braun, V. [Universität Regensburg (Germany)], Chang, W. C. [Academia Sinica, Taipei (Taiwan)], Chatagnon, P. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Constantinou, M. [Temple University, Philadelphia, PA (United States)], Guo, Y. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Hutauruk, P. T. P. [Pukyong National University (PKNU), Busan (Korea)], Jo, H. S. [Kyungpook National University, Daegu (Korea)], Kim, A. [University of Connecticut, Storrs, CT (United States)], Kim, J. -Y. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Kroll, P. [University of Wuppertal (Germany)], Kumano, S. [Japan Women’s University, Tokyo (Japan); Institute of Particle and Nuclear Studies, KEK, Ibaraki (Japan)], Lee, C. -H. [Pusan National University, Busan (Korea); POSTECH, Pohang (Korea)], Liuti, S. [University of Virginia, Charlottesville, VA (United States)], McNulty, R. [University College Dublin (Ireland)], Son, H. -D. [Inha University, Incheon (Korea)], Sznajder, P. [National Centre for Nuclear Research (NCBJ), Warsaw (Poland)], Usman, A. [University of Regina (Canada)], Van Hulse, C. [Universidad de Alcalá, Alcalá de Henares (Spain)], Vanderhaeghen, M. [Johannes Gutenberg Universität, Mainz (Germany)], Winn, M. [CEA Saclay, Gif sur Yvette (France)]. 2025-06-06. Exploring baryon resonances with transition generalized parton distributions: status and perspectives. https://doi.org/10.1140/epja%2Fs10050-025-01552-2

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