Onset of scaling violation in pion and kaon elastic electromagnetic form factors

• Published in: Physics letters. B Vol. 855; p. 138823
• Main Authors: Yao, Zhao-Qian, Binosi, Daniele, Roberts, Craig D.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2024; Elsevier
• Subjects: Continuum Schwinger function methods; Elastic electromagnetic form factors; Emergence of mass; Hard exclusive processes; Nambu-Goldstone bosons; Scaling violations; Elastic electromagnetic form factors; Emergence of mass; Continuum Schwinger function methods; Nambu-Goldstone bosons; Scaling violations; Hard exclusive processes
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2024.138823

Using a symmetry-preserving truncation of the quantum field equations describing hadron properties, parameter-free predictions are delivered for pion and kaon elastic electromagnetic form factors, FP=π,K, thereby unifying them with kindred results for nucleon elastic electromagnetic form factors. Regarding positive-charge states, the analysis stresses that the presence of scaling violations in QCD entails that Q2FP(Q2) should exhibit a single maximum on Q2>0. Locating such a maximum is both necessary and sufficient to establish the existence of scaling violations. The study predicts that, for charged π, K mesons, the Q2FP(Q2) maximum lies in the neighbourhood Q2≃5 GeV2. Foreseeable experiments will test these predictions and, providing their Q2 reach meets expectations, potentially also provide details on the momentum dependence of meson form factor scaling violation.