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HK: Fachverband Physik der Hadronen und Kerne

HK 37: Hadron Structure and Spectroscopy VII

HK 37.4: Talk

Thursday, March 19, 2026, 17:15–17:30, PHIL C 301

The GSI pion beam program: QCD-driven studies of hadron structure and dynamics — •Marvin Kohls — GSI Helmholtzzentrum für Schwerionenforschung GmbH

We present plans for the upcoming pion beam program at GSI from 2027 on. This program leverages secondary pion beams (< 2 GeV/c) in combination with the HADES spectrometer to address fundamental questions in strong QCD physics with a focus on precision studies in the fields of baryon spectroscopy and structure. We will determine baryon-meson coupling constants and electromagnetic transition form factors in the time-like region. With the planned beam intensities we expect to collect enough statistics to enable detailed partial wave analyses and the study of rare decay channels. These measurements are crucial for understanding hadron structure and for modeling dilepton emission in heavy-ion collisions. As a complementary focus, we study vector meson properties in cold nuclear matter through dielectron spectroscopy. The program will investigate in-medium modifications of vector mesons and their relation to chiral symmetry restoration. This program represents a principal component of the broader QCD-driven roadmap at GSI/FAIR (QCD at FAIR), bridging nuclear, hadron, and heavy-ion physics communities while complementing photon beam facilities worldwide.

Keywords: GSI/FAIR; HADES; FFN; Pion-induced