Highlights of Resonance Measurements With HADES

E Epple ,A Lebedev,V Metag,R Holzmann,A Krása,L Naumann,Y Parpottas,J Siebenson,A Rustamov,G Kornakov,P Salabura,J A Garzón,K Teilab,A Ivashkin,C Sturm,T Hennino,C Wendisch,B Ramstein,J Friese,V Pechenov,H Tsertos,C Höhne,T Scheib,S Spataro,B W Kolb,A Rost,M Traxler,L Lopes,I Fröhlich,P Zumbruch,M Gumberidze,L Maier,O Pechenova,M Böhmer,T Galatyuk,C Müntz,A Tarantola,A Mangiarotti,K Kardan,A Blanco,R Lalik,A Sadovsky,J Wüstenfeld,P Strzempek,J Markert,H Kuc,J Michel,C Deveaux,O Svoboda,P Sellheim,H Ströbele,J Adamczewski-Musch,P Bordalo,V Wagner,H Schuldes,P Fonte,J Pietraszko,S Harabasz,T Kunz,C Behnke,A Dybczak,W Przygoda ,A Kurilkin ,B Kämpfer ,J C Berger-Chen ,L Rehnisch ,R Kötte ,V P Ladygin ,M Pałka ,C Blume ,Y Zanevsky ,I Köenig ,S Chernenko ,T Vasiliev ,А Куглер ,J Biernat ,O Fateev ,Robert Helmut Münzer ,A Ierusalimov ,P K Kurilkin ,A Reshetin ,P Tlustý ,O Arnold ,Yu G Sobolev ,W Koenig ,M Jurkovič ,K R Schmidt-Sommerfeld ,M Golubeva ,K Gill ,E T Atomssa ,C Franco ,Η Krebs ,T Karavicheva ,F Guber ,K Lapidus ,M Lorenz ,J Stroth ,T Mahmoud ,V Petousis ,L Silva ,J Wirth ,S Hlaváč ,L Fabbietti ,A Kurepin ,G Korcyl

doi:10.1051/epjconf/20159700015

Abstract

This contribution aims to give a basic overview of the latest results regarding the production of resonances in different collision systems. The results were extracted from experimental data collected with HADES that is a multipurpose detector located at the GSI Helmholtzzentrum, Darmstadt. The main points discussed here are: the properties of the strange resonances Lambda(1405) and Sigma(1385), the role of Delta's as a source of pions in the final state, the production dynamics reflected in form of differential cross sections, and the role of the phi meson as a source for K^- particles.

Highlights

In the last years new efforts have been set to gain a comprehensive understanding for resonance production in elementary, and heavy ion reactions
The importance of resonance properties for the in-medium anti-kaon propagation was the motivation for two analyses regarding the strange resonances Λ(1405) and Σ(1385)+ with HADES
Apart from the fact that HADES has shown in many ways how important Δ’s are as a source for hadrons, we have investigated the production kinematic of several exclusive final states

Summary

Introduction

In the last years new efforts have been set to gain a comprehensive understanding for resonance production in elementary, and heavy ion reactions. A nice example is the extraction of different effective temperatures for K+ and K− in Ar+KCl collisions [1]. This observation is, not a sign of a different thermal decoupling of the two mesons from the medium but originates from the different production mechanisms for the two kaon species [2]. A large fraction of K− stems from the φ decay which modifies their observed spectrum Starting from these and other observations, HADES has intensively studied resonance production in several light colliding systems (p+p, d+p, p+Nb) to build a solid basis for the understanding of hadron properties in heavier collision systems. For details about the experimental setup see Ref. [9]

Strange Resonances by HADES

The Importance of Δ’s

Angular Distributions

Summary