HADES Collaboration

Pion beams are perfect tools to probe resonance excitations at a fixed energy, thus properties of baryonic resonances and their coupling channels can be studied. The HADES Collaboration performed a systematic scan around the second resonance region at four different pion beam momenta 0.656, 0.69, 0.748 and 0.8 GeV/c in π− p reaction. The role of the N(1520) resonance in conjunction with the intermediate ρ-meson production has been studied in the framework of a partial wave analysis. Preliminary results on exclusive channels with one pion (π− p) and two pions (nπ+π− and pπ−π0) in the final state are presented.

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Subthreshold Ξ− production in proton-nucleus collisions in a BUU model

EPJ Web of Conferences ◽

10.1051/epjconf/201817119006 ◽

2018 ◽

Vol 171 ◽

pp. 19006

Author(s):

Miklós Zétényi ◽

György Wolf

Keyword(s):

Cross Sections ◽

Transport Model ◽

Hyperon Production ◽

Step Process ◽

Hades Collaboration ◽

Buu Model

We study the production of the doubly strange Ξ baryon in subthreshold p + A collisions using a BUU type transport model. We propose a new mechanism for Ξ creation in a two-step process via hyperon-nucleon collisions. We study the influence of the anisotropy of hyperon production in N + N collisions on the Ξ multiplicity. Applying reasonable assumptions on the unknown elementary cross sections, we are able to reconstruct the Ξ yield observed by the HADES collaboration (GSI, Darmstadt) in subthreshold p+Nb collisions.

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Nuclear Physics A ◽

10.1016/j.nuclphysa.2006.07.008 ◽

2006 ◽

Vol 774 ◽

pp. 940-941

Author(s):

G. Agakichiev ◽

C. Agodi ◽

H. Alvarez-Pol ◽

E. Badura ◽

A. Balanda ◽

...

Keyword(s):

Hades Collaboration

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DIELECTRON PRODUCTION IN Ar+KCl AT 1.756 AGeV WITH HADES

International Journal of Modern Physics A ◽

10.1142/s0217751x09044176 ◽

2009 ◽

Vol 24 (02n03) ◽

pp. 603-606

Author(s):

◽

FILIP KŘÍŽEK

Keyword(s):

Experimental Data ◽

Monte Carlo ◽

Data Analysis ◽

Thermal Model ◽

Beam Energy ◽

Monte Carlo Event ◽

Event Generator ◽

Monte Carlo Event Generator ◽

Hades Collaboration ◽

Experimental Data Analysis

The HADES collaboration studied dielectron production in C + C , p + p , and d + p reactions, with the main goal to investigate properties of vectors mesons through their dielectron decay. Production of e+e- pairs in Ar + KCl collisions at a beam energy of 1.756 A GeV was measured recently by the collaboration and preliminary results of the experimental data analysis will be reported. Pair spectra will be compared with a prediction of a thermal model based on the Monte Carlo event generator Pluto.

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STUDY OF INTERFERENCE EFFECTS ON THE Λ(1405) LINE SHAPE MEASURED BY HADES IN p+p COLLISIONS

International Journal of Modern Physics Conference Series ◽

10.1142/s2010194514600854 ◽

2014 ◽

Vol 26 ◽

pp. 1460085

Author(s):

L. FABBIETTI

Keyword(s):

Kinetic Energy ◽

Theoretical Prediction ◽

Phenomenological Model ◽

Line Shape ◽

Theoretical Models ◽

Wigner Functions ◽

Interference Effects ◽

Final State ◽

Hades Collaboration

In this work we investigate the possible interference effects between the Λ(1405) and the non-resonant final state in p+p reactions at 3.5 GeV beam kinetic energy measured by the HADES collaboration. The two poles nature of the Λ(1405), which is supported by most of the theoretical models, are parametrized within a simplified phenomenological model with Breit-Wigner functions to evaluate the interference effects. The model is adjusted such as to be in accordance with the theoretical prediction for the Λ(1405) in p+p collisions.

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