Delta (1232) Dalitz decay in proton-proton collisions at T=1.25 GeV measured with HADES at GSI

0477319 - ÚJF 2018 RIV US eng J - Článek v odborném periodiku
Adamczewski-Musch, J. - Arnold, O. - Atomssa, E. T. - Chlad, Lukáš - Kugler, Andrej - Rodriguez Ramos, Pablo - Sobolev, Yuri, G. - Svoboda, Ondřej - Tlustý, Pavel - Wagner, Vladimír … celkem 118 autorů
Delta (1232) Dalitz decay in proton-proton collisions at T=1.25 GeV measured with HADES at GSI.
Physical Review C. Roč. 95, č. 6 (2017), č. článku 065205. ISSN 2469-9985. E-ISSN 2469-9993
Grant CEP: GA ČR GA13-06759S
Institucionální podpora: RVO:61389005
Klíčová slova: HADES collaboration * heavy ion collisions * Delta(1232)
Obor OECD: Nuclear physics
Impakt faktor: 3.304, rok: 2017

We report on the investigation of Delta(1232) production and decay in proton-proton collisions at a kinetic energy of 1.25 GeV measured with HADES. Exclusive dilepton decay channels ppe(+) e(-) and ppe(+) e(-). have been studied and compared with the partial-wave analysis of the hadronic pp pi(0) channel. They allow to access both Delta(+) -> p pi(0)( e(+) e(-) gamma) and Delta(+) -> pe(+) e(-) Dalitz decay channels. The perfect reconstruction of the well-known pi(0) Dalitz decay serves as a proof of the consistency of the analysis. The Delta Dalitz decay is identified for the first time and the sensitivity to N-Delta transition form factors is tested. The Delta (1232) Dalitz decay branching ratio is also determined for the first time. Our result is (4.19 +/- 0.62 syst. +/- 0.34 stat.) x 10(-5), albeit with some model dependence.
Trvalý link: http://hdl.handle.net/11104/0273697