2018/02/05 by D. Werthmüller, Werthmüller, D., R. A. Schumacher +1
Engineering · Physics and Astronomy · #FOS: Physical sciences #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Superconducting Materials and Applications #nucl-ex
paper · pdf · doi:10.48550/arxiv.1802.01720
Proposal for an Experiment at MAMI, presented to the PAC 2016, November 2016, 32 pages, 25 figures
arxiv created 2018/02/05 · openalex publication_date 2018/02/05 · arxiv updated 2018/02/07 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
We propose to use the high current photon beam available at A2 to produce the isosinglet Λ(1405)1/2- hyperon at threshold via γp→ K+Λ(1405). Its nature is still controversial and actively debated. Since the only available photoproduction data from CLAS are lacking in precision in the Σ0π0 decay channel, we propose a new independent measurement of this most important pure I = 0 final state including the unmeasured beam-helicity observable I^\odot. In addition, the excellent photon detection acceptance of the A2 setup will offer the opportunity for a first measurement of the radiative decays of the Λ(1405), which will provide clean and stringent constraints for model descriptions in terms of, e.g., unitary chiral perturbation theory.