EPJ Web of Conferences (Jan 2014)

Measurement of the quasi free np → npπ+π− and np → ppπ−π0 reactions at 1.25 GeV With HADES

  • Kurilkin A.,
  • Arnold O.,
  • Atomssa E. T.,
  • Behnke C.,
  • Belyaev A.,
  • Berger-Chen J. C.,
  • Biernat J.,
  • Blanco A.,
  • Blume C.,
  • Böhmer M.,
  • Bordalo P.,
  • Chernenko S.,
  • Deveaux C.,
  • Dybczak A.,
  • Epple E.,
  • Fabbietti L.,
  • Fateev O.,
  • Fonte P.,
  • Franco C.,
  • Friese J.,
  • Fröhlich I.,
  • Galatyuk T.,
  • Garzón J. A.,
  • Gill K.,
  • Golubeva M.,
  • González-Díaz D.,
  • Guber F.,
  • Gumberidze M.,
  • Harabasz S.,
  • Hennino T.,
  • Höhne C.,
  • Holzmann R.,
  • Ierusalimov A.,
  • Ivashkin A.,
  • Jurkovic M.,
  • Kämpfer B.,
  • Karavicheva T.,
  • Kardan K.,
  • Koenig I.,
  • Koenig W.,
  • Kolb B. W.,
  • Korcyl G.,
  • Kornakov G.,
  • Kotte R.,
  • Krása A.,
  • Krebs E.,
  • Krizek F.,
  • Kuc H.,
  • Kugler A.,
  • Kunz T.,
  • Kurepin A.,
  • Kurilkin P.,
  • Ladygin V.,
  • Lalik R.,
  • Lang S.,
  • Lapidus K.,
  • Lebedev A.,
  • Lopes L.,
  • Lorenz M.,
  • Maier L.,
  • Mangiarotti A.,
  • Markert J.,
  • Metag V.,
  • Michel J.,
  • Müntz C.,
  • Münzer R.,
  • Naumann L.,
  • Palka M.,
  • Pechenov V.,
  • Pechenova O.,
  • Petousis V.,
  • Pietraszko J.,
  • Przygoda W.,
  • Ramstein B.,
  • Rehnisch L.,
  • Reshetin A.,
  • Rost A.,
  • Rustamov A.,
  • Sadovsky A.,
  • Salabura P.,
  • Scheib T.,
  • Schmidt-Sommerfeld K.,
  • Schuldes H.,
  • Sellheim P.,
  • Siebenson J.,
  • Silva L.,
  • Sobolev Yu. G.,
  • Spataro S.,
  • Ströbele H.,
  • Stroth J.,
  • Strzempek P.,
  • Sturm C.,
  • Svoboda O.,
  • Tarantola A.,
  • Teilab K.,
  • Tlusty P.,
  • Traxler M.,
  • Tsertos H.,
  • Vasiliev T.,
  • Wagner V.,
  • Wendisch C.,
  • Wirth J.,
  • Wüstenfeld J.,
  • Yurevich S.,
  • Zanevsky Y.

DOI
https://doi.org/10.1051/epjconf/20148102009
Journal volume & issue
Vol. 81
p. 02009

Abstract

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We present the results of two-pion production in tagged quasi-free np collisions at a deutron incident beam energy of 1.25 GeV/c measured with the High-Acceptance Di-Electron Spectrometer (HADES) installed at GSI. The specific acceptance of HADES allowed for the first time to obtain high-precision data on π+π− and π−π0 production in np collisions in a region corresponding to large transverse momenta of the secondary particles. The obtained differential cross section data provide strong constraints on the production mechanisms and on the various baryon resonance contributions (∆∆, N(1440), N(1520), ∆(1600)). The invariant mass and angular distributions from the np → npπ+π −and np → ppπ−π0 reactions are compared with different theoretical model predictions.