We report on recent data of e+e− pair emission in proton nucleus collisions at energies above the light vector meson production thresholds. Invariant mass distributions for the p+Nb system at Ekin = 3.5 GeV are compared to data from elementary p+p reactions at the same beam energy. We observe a constant π0/ω yield ratio for both systems but an excess in the mass region above the π0 mass. Furthermore we present here the normalization procedure that was applied to p+Nb collisions by measuring the production of negative pions in the HADES acceptance.

Inclusive e+e−pair production in p+p and p+Nb collisions at Ekin= 3.5 GeV

SPATARO, STEFANO GIOVANNI;
2011-01-01

Abstract

We report on recent data of e+e− pair emission in proton nucleus collisions at energies above the light vector meson production thresholds. Invariant mass distributions for the p+Nb system at Ekin = 3.5 GeV are compared to data from elementary p+p reactions at the same beam energy. We observe a constant π0/ω yield ratio for both systems but an excess in the mass region above the π0 mass. Furthermore we present here the normalization procedure that was applied to p+Nb collisions by measuring the production of negative pions in the HADES acceptance.
2011
27TH WINTER WORKSHOP ON NUCLEAR DYNAMICS (WWND 2011)
Winter Park, Colorado (USA)
6-13 February 2011
316
012007-1
012007-7
NUCLEI; PHOTOPRODUCTION; OMEGA
Michael Weber;G Agakishiev;D Belver;A Belyaev;A Blanco;M Böhmer;P Cabanelas;S Chernenko;A Dybczak;E Epple;L Fabbietti;O Fateev;P Finocchiaro;P Fonte;J Friese;I Fröhlich;T Galatyuk;J A Garzón;M Golubeva;D González-Díaz;F Guber;M Gumberidze;T Hennino;R Holzmann;P Huck;A Ierusalimov;A Ivashkin;M Jurkovic;B Kämpfer;T Karavicheva;I Koenig;W Koenig;B W Kolb;G Korcyl;G Kornakov;R Kotte;A Kozuch;A Krása;F Krizek;R Krücken;H Kuc;W Kühn;A Kugler;A Kurepin;A Kurilkin;P Kurilkin;V Ladygin;S Lang;K Lapidus;T Liu;L Lopes;M Lorenz;L Maier;A Mangiarotti;J Markert;V Metag;B Michalska;J Michel;C Müntz;L Naumann;Y C Pachmayer;M Palka;Y Parpottas;V Pechenov;O Pechenova;J Pietraszko;W Przygoda;B Ramstein;A Reshetin;A Rustamov;A Sadovsky;P Salabura;A Schmah;J Siebenson;Yu G Sobolev;S Spataro;H Ströbele;J Stroth;C Sturm;A Tarantola;K Teilab;P Tlusty;M Traxler;R Trebacz;H Tsertos;T Vasiliev;V Wagner;M Weber;J Wüstenfeld;S Yurevich;Y Zanevsky
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/123798
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