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Accueil du site > Publications récentes > Delta(1232) Dalitz decay in proton-proton collisions at T=1.25 GeV measured with HADES at GSI

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

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+eγ have been studied and compared with the partial-wave analysis of the hadronic ppπ0 channel. They allow to access both Δ+→pπ0(e+eγ) 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.

Voir en ligne : Physical Review C (Vol.95, No.6)


 

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Institut de Physique Nucléaire Orsay - 15 rue Georges CLEMENCEAU - 91406 ORSAY (FRANCE)
UMR 8608 - CNRS/IN2P3

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