We present measurements of exclusive pi(+,0) and eta production in pp reactions at 1.25 GeV and 2.2 GeV beam kinetic energy in hadron and dielectron channels. In the case of pi(+) and pi(0), high-statistics invariant-mass and angular distributions are obtained within the HADES acceptance as well as acceptance-corrected distributions, which are compared to a resonance model. The sensitivity of the data to the yield and production angular distribution of Delta(1232) and higher-lying baryon resonances is shown, and an improved parameterization is proposed. The extracted cross-sections are of special interest in the case of pp -> pp eta, since controversial data exist at 2.0 GeV; we find sigma = 0.142 +/- 0.022 mb. Using the dielectron channels, the pi(0) and eta Dalitz decay signals are reconstructed with yields fully consistent with the hadronic channels. The electron invariant masses and acceptance-corrected helicity angle distributions are found in good agreement with model predictions.

Study of exclusive one-pion and one-eta production using hadron and dielectron channels in pp reactions at kinetic beam energies of 1.25 GeV and 2.2 GeV with HADES

DESTEFANIS, MARCO GIOVANNI;SPATARO, STEFANO GIOVANNI;
2012-01-01

Abstract

We present measurements of exclusive pi(+,0) and eta production in pp reactions at 1.25 GeV and 2.2 GeV beam kinetic energy in hadron and dielectron channels. In the case of pi(+) and pi(0), high-statistics invariant-mass and angular distributions are obtained within the HADES acceptance as well as acceptance-corrected distributions, which are compared to a resonance model. The sensitivity of the data to the yield and production angular distribution of Delta(1232) and higher-lying baryon resonances is shown, and an improved parameterization is proposed. The extracted cross-sections are of special interest in the case of pp -> pp eta, since controversial data exist at 2.0 GeV; we find sigma = 0.142 +/- 0.022 mb. Using the dielectron channels, the pi(0) and eta Dalitz decay signals are reconstructed with yields fully consistent with the hadronic channels. The electron invariant masses and acceptance-corrected helicity angle distributions are found in good agreement with model predictions.
2012
48
74-1
74-17
http://link.springer.com/article/10.1140/epja/i2012-12074-9
proton-proton collisions; NUCLEON-NUCLEON COLLISIONS; OF-FLIGHT SPECTROMETER; TOTAL CROSS-SECTIONS; NEAR-THRESHOLD; MESON PRODUCTION; INTERMEDIATE ENERGIES; SIS ENERGIES; SINGLE-PION; SCATTERING
G. Agakishiev;H. Alvarez-Pol;A. Balanda;R. Bassini;M. Böhmer;H. Bokemeyer;J. L. Boyard;P. Cabanelas;S. Chernenko;T. Christ;M. Destefanis;F. Dohrmann;A. Dybczak;T. Eberl;L. Fabbietti;O. Fateev;P. Finocchiaro;J. Friese;I. Fröhlich;T. Galatyuk;J. A. Garzón;R. Gernhäuser;C. Gilardi;M. Golubeva;D. González-Dıaz;F. Guber;M. Gumberidze;T. Hennino;R. Holzmann;A. Ierusalimov;I. Iori;A. Ivashkin;M. Jurkovic;B. Kämpfer;K. Kanaki;T. Karavicheva;I. Koenig;W. Koenig;B. W. Kolb;R. Kotte;A. Kozuch;F. Krizek;W. Kühn;A. Kugler;A. Kurepin;S. Lang;K. Lapidus;T. Liu;L. Maier;J. Markert;V. Metag;B. Michalska;E. Morinière;J. Mousa;M. Münch;C. Müntz;L. Naumann;J. Otwinowski;Y. C. Pachmayer;V. Pechenov;O. Pechenova;T. Pérez Cavalcanti;J. Pietraszko;V. Pospısil;W. Przygoda;B. Ramstein;A. Reshetin;M. Roy-Stephan;A. Rustamov;A. Sadovsky;B. Sailer;P. Salabura;M. Sánchez;A. Schmah;E. Schwab;Yu. G. Sobolev;S. Spataro;B. Spruck;H. Ströbele;J. Stroth;C. Sturm;A. Tarantola;K. Teilab;P. Tlusty;A. Toia;M. Traxler;R. Trebacz;H. Tsertos;V. Wagner;M. Wisniowski;T. Wojcik;J. Wüstenfeld;S. Yurevich;Y. Zanevsky;P. Zumbruch
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/121139
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