Erlangen 2026 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 2: Hadron Structure and Spectroscopy I
HK 2.4: Talk
Monday, March 16, 2026, 17:30–17:45, PHIL C 301
Feasibility studies of hyperon transition form factors with CBM at FAIR — •Shreya Roy for the CBM collaboration — GSI Helmholtzzentrum für Schwerionenforschung GmbH Planckstraße 1 64291 Darmstadt
Electromagnetic transition form factors (eTFFs) probe the internal structure of baryons. In the timelike region (q2>0), they are accessible, for example via Dalitz decays Y*→ Y e+e−. Previous results from HADES exist for light baryons (e.g. Δ(1232), N*(1520)) that tested vector–meson dominance and revealed meson–cloud effects. To take the studies to the next level, the feasibility of extending this program to the strange sector with the Compressed Baryonic Matter (CBM) experiment at FAIR, Darmstadt, has been investigated. This contribution will cover details of the analysis strategy for exclusive Λ reconstruction in the pp → pK+Λ channel using CBM tracking, PID, and kinematic fitting in the simulation. We then extend the study to the Dalitz channel pp → pK+Λ(1520) with Λ(1520)→Λ e+e− to assess the sensitivity to timelike eTFFs and the possible kaon-cloud dynamics. Background simulation is under investigation. The obtained invariant-mass resolution, acceptance×efficiency, expected signal rates at CBM luminosities, form-factor sensitivity, and the accessible baryon radius will be presented.
Keywords: hyperon; form factors; exclusive pp reactions; CBM; Lambda(1520)