Production and electromagnetic decay of hyperons: a feasibility study with HADES as a phase-0 experiment at FAIR
J. Adamczewski-Musch, A. Belyaev, A. Blanco, C. Blume, C. Charlotte, D. S. Borisenko, C. Charlotte, L. Chlad, P. Chudoba, I. Ciepał, A. Derichs, D. Dittert, J. Dreyer, Waleed Esmail, O. Fateev, P. Fonte, J. Friese, I. Fröhlich, J. Förtsch, T. Galatyuk, I. Georgadze, O. Golosov, M. Golubeva, R. Greifenhagen, M. Grunwald, D. Grzonka, F. Guber, M. Gumberidze, S. Harabasz, T. Heinz, B. Heybeck, C. Höhne, M. Holona, R. Holzmann, Holger Huck, A. Ierusalimov, M. Imre, A. Ivashkin, B. Kämpfer, K.‐H. Kampert, B. Kardan, V. Kedych, V. A. Khomyakov, I. Köenig, Wolfgang Köenig, M. Kohls, G. Kornakov, F. Kornas, R. Kotte, A. Kozela, V. Kozlov, I. Kres, J. Kuboś, A. Kugler, P. Kulessa, V. P. Ladygin, R. Lalik, C. Le Galliard, A. Lebedev, S. Lebedev, S. Linev, L. Lopes, M. Lorenz, G. I. Lykasov, A. Malige, J. Markert, T. Matulewicz, J. Michel, S. Morozov, C. Müntz, L. Naumann, K. Nowakowski, S. Orfanitsky, J.–H. Otto, V. Patel, C. Pauly, V. Pechenov, O. Pechenova, G. Perez Andrade, O. Petukhov, D. Pfeifer, K. Piasecki, J. Pietraszko, A. Prozorov, Witold Wojciech Przygoda, K. Pysz, B. Ramstein, N. Rathod, Jenny Regina, A. Reshetin, S. G. Reznikov, Jana Rieger, J. Ritman, P. Rodríguez-Ramos, A. Rost, A. Rustamov, P. Salabura, J. de Carvalho Saraiva, Niklas Schild, E. Schwab
Abstract
Abstract A feasibility study has been performed in order to investigate the performance of the HADES detector to measure the electromagnetic decays of the hyperon resonances $$\Sigma (1385)^{0}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Σ</mml:mi><mml:msup><mml:mrow><mml:mo>(</mml:mo><mml:mn>1385</mml:mn><mml:mo>)</mml:mo></mml:mrow><mml:mn>0</mml:mn></mml:msup></mml:mrow></mml:math> , $$\Lambda (1405)$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Λ</mml:mi><mml:mo>(</mml:mo><mml:mn>1405</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math> and $$\Lambda (1520)$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Λ</mml:mi><mml:mo>(</mml:mo><mml:mn>1520</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math> as well as the production of double strange baryon systems $$\Xi ^{-}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>Ξ</mml:mi><mml:mo>-</mml:mo></mml:msup></mml:math> and $$\Lambda $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>Λ</mml:mi></mml:math> $$\Lambda $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>Λ</mml:mi></mml:math> in p + p reactions at a beam kinetic energy of $$4.5\,{\mathrm{GeV}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>4.5</mml:mn><mml:mspace/><mml:mi>GeV</mml:mi></mml:mrow></mml:math> . The existing HADES detector will be upgraded by a new Forward Detector, which extends the detector acceptance into a range of polar angles that plays a crucial role for these investigations. The analysis of each channel is preceded by a consideration of the production cross-sections. Afterwards the expected signal count rates using a target consisting of either liquid hydrogen or polyethylene are summarized.