Reconstruction of gamma-gamma mass spectra in Ag+Ag collisions at 1.23 and 1.58 AGeV beam energies with ECal detector of the HADES experiment

0538363 - ÚJF 2021 RIV GB eng C - Conference Paper (international conference)
Shabanov, A. - Prozorov, Alexandr P. - Chudoba, Petr - Galatyuk, T. - Guber, F. - Gumberidze, M. - Ivashkin, A. - Kugler, Andrej - Lalik, R. - Morozov, S. - Pechenov, V. - Petukhov, O. A. - Pietraszko, J. - Rathod, N. - Reshetin, A. - Rost, A. - Svoboda, Ondřej - Salabura, P. - Tlustý, Pavel
Reconstruction of gamma-gamma mass spectra in Ag+Ag collisions at 1.23 and 1.58 AGeV beam energies with ECal detector of the HADES experiment.
Journal of Physics: Conference Series. Vol. 1690. Bristol: IOP Publishing, 2020, č. článku 012133. ISSN 1742-6588.
[5th International Conference on Particle Physics and Astrophysics (ICPPA 2020). Moscow (RU), 05.10.2020-09.10.2020]
R&D Projects: GA MŠMT LM2018112; GA MŠMT EF16_013/0001677; GA MŠMT LTT17003
Institutional support: RVO:61389005
Keywords : ECal detector * mass spectrometry * HADES
OECD category: Particles and field physics

HADES is a high acceptance di-electron spectrometer operating at SIS18, GSI, Germany aimed at study of hadron-proton, hadron-nucleus and nucleus-nucleus collisions at 1-4 AGeV beam energies. The new electromagnetic calorimeter (ECal) was added to the experimental setup in order to measure γ-quanta and thus extend its capabilities in study of pi 0-, Eta-mesons, production of neutral hyperons and to improve electron-To-hadron separation for the partcles with momenta p > 300 MeV/c. The first data taking with the ECal detector was carried out in March 2019 when Ag+Ag collisions at 1.23 AGeV and 1.58 AGeV beam energies were studied. The methods of reconstruction of the yy invariant mass spectra from these data are discussed. The analysis includes several steps: calibration of each module of the ECal detector, identification of gamma-quanta, reconstruction of yy invariant mass spectra and subtraction of combinatorial background. The obtained results show experimental capabilities of the new detector and, after efficiency corrections, will allow to normalize yields of other particles.
Permanent Link: http://hdl.handle.net/11104/0316172