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München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Hadron Structure and Spectroscopy V

HK 33.4: Talk

Wednesday, March 20, 2019, 15:15–15:30, HS 13

Electromagnetic decay of excited hyperons at HADES — •Waleed Esmail, Tobias Stockmanns, and James Ritman for the HADES Kollaboration collaboration — Forschungszentrum Jülich GmbH, IKP1, 52428 Jülich, Germany

The electromagnetic (EM) decay of excited hyperons states is a very sensitive probe of the structure of hyperons, since the electromagnetic transitions provide a relatively clean probe of the wave functions of the initial and final baryon states. We propose to measure of EM decay channels of excited hyperons produced in p+p reactions at 4.5GeV using HADES spectrometer. Results from HADES on both photon and dielectron decays such as Σ(1385) → Λ γ (e+e) will have significant impact on the understanding of the structure of the strange resonances in the region of small q2. The hyperon reconstruction will significantly benefit from the proposed Forward Detector (FD) that extends HADES acceptance in the forward direction towards lower polar angles 0.5o−6.5o. This detection system consists of two tracking stations based on straw tubes followed by a time-of-flight wall based on RPC technology. The goal is to perform a semi-inclusive reconstruction of excited hyperon decays tagged by the reconstruction of the Λ→ pπ ground state in association with a photon/dielectron pair. Since the FD will be operated in a region without magnetic field, a reconstruction of the momentum vector will be provided by a time-of-flight measurement in the RPC, and measurement of the track direction by means of the straw tube stations. This talk will provide a brief overview of the science case and the simulation results of the expected performance.

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