Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 22: Hadron Structure and Spectroscopy IV

HK 22.5: Talk

Tuesday, February 27, 2018, 17:45–18:00, HZO 50

Search for Light Exotic Baryons at the A2 Experiment — •Dominik Werthmüller for the A2 collaboration — School of Physics and Astronomy, University of Glasgow, United Kingdom

The recent claim of a heavy hidden-charm pentaquark by the LHCb collaboration reignites the question of whether exotic baryons can also be built only from light quarks. The existence of a strange pentaquark, initially alleged by the LEPS collaboration in 2003, was never convincingly substantiated. On the other hand, the unusual properties of certain nucleon and hyperon states, such as the N(1440), the N(1535), and the Λ(1405), could be attributed to an exotic pentaquark nature. Moreover, there are new hints of a potentially exotic signature in the η N system.

Light exotic baryons can be produced in photoproduction reactions at the tagged-photon beam experiment A2 located at the MAMI electron accelerator facility in Mainz. This contribution will give an overview of recent results and current activities on the search for light exotic baryons at A2.