We report on the investigation of Δ(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-γ have been studied and compared with the partial-wave analysis of the hadronic ppπ0 channel. They allow to access both Δ+→pπ0(e+e-γ) and Δ+→pe+e- Dalitz decay channels. The perfect reconstruction of the well-known π0 Dalitz decay serves as a proof of the consistency of the analysis. The Δ Dalitz decay is identified for the first time and the sensitivity to N-Δ transition form factors is tested. The Δ(1232) Dalitz decay branching ratio is also determined for the first time; our result is (4.19 ± 0.62 syst. ± 0.34 stat.) ×10-5, albeit with some model dependence.

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

Spataro S.;
2017-01-01

Abstract

We report on the investigation of Δ(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-γ have been studied and compared with the partial-wave analysis of the hadronic ppπ0 channel. They allow to access both Δ+→pπ0(e+e-γ) and Δ+→pe+e- Dalitz decay channels. The perfect reconstruction of the well-known π0 Dalitz decay serves as a proof of the consistency of the analysis. The Δ Dalitz decay is identified for the first time and the sensitivity to N-Δ transition form factors is tested. The Δ(1232) Dalitz decay branching ratio is also determined for the first time; our result is (4.19 ± 0.62 syst. ± 0.34 stat.) ×10-5, albeit with some model dependence.
2017
95
6
065205-1
065205-12
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.95.065205
Adamczewski-Musch J.; Arnold O.; Atomssa E.T.; Behnke C.; Belounnas A.; Belyaev A.; Berger-Chen J.C.; Biernat J.; Blanco A.; Blume C.; Bohmer M.; Bordalo P.; Chernenko S.; Chlad L.; Deveaux C.; Dreyer J.; Dybczak A.; Epple E.; Fabbietti L.; Fateev O.; Filip P.; Finocchiaro P.; Fonte P.; Franco C.; Friese J.; Frohlich I.; Galatyuk T.; Garzon J.A.; Gernhauser R.; Golubeva M.; Guber F.; Gumberidze M.; Harabasz S.; Heinz T.; Hennino T.; Hlavac S.; Hohne C.; Holzmann R.; Ierusalimov A.; Ivashkin A.; Kampfer B.; Karavicheva T.; Kardan B.; Koenig I.; Koenig W.; Kolb B.W.; Korcyl G.; Kornakov G.; Kotte R.; Kuhn W.; Kugler A.; Kunz T.; Kurepin A.; Kurilkin A.; Kurilkin P.; Ladygin V.; Lalik R.; Lapidus K.; Lebedev A.; Liu T.; Lopes L.; Lorenz M.; Mahmoud T.; Maier L.; Mangiarotti A.; Markert J.; Maurus S.; Metag V.; Michel J.; Moriniere E.; Mihaylov D.M.; Morozov S.; Muntz C.; Munzer R.; Naumann L.; Nowakowski K.; Palka M.; Parpottas Y.; Pechenov V.; Pechenova O.; Petousis V.; Petukhov O.; Pietraszko J.; Przygoda W.; Ramos S.; Ramstein B.; Reshetin A.; Rodriguez-Ramos P.; Rosier P.; Rost A.; Sadovsky A.; Salabura P.; Scheib T.; Schuldes H.; Schwab E.; Scozzi F.; Seck F.; Sellheim P.; Siebenson J.; Silva L.; Sobolev Y.G.; Spataro S.; Strobele H.; Stroth J.; Strzempek P.; Sturm C.; Svoboda O.; Tlusty P.; Traxler M.; Tsertos H.; Usenko E.; Wagner V.; Wendisch C.; Wiebusch M.G.; Wirth J.; Zanevsky Y.; Zumbruch P.; Sarantsev A.V.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1803743
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