We present results of an exclusive measurement of the first-excited state of the Sigma hyperon, Sigma(1385)(+), produced in p + p -> Sigma(+) + K+ + n at 3.5 GeV beam energy. The extracted data allow the detailed study of the invariant mass distribution of the Sigma(1385)(+). The mass distribution is well described by a relativistic Breit-Wigner function with a maximum at m(0) = 1383.2 +/- 0.9 MeV/c(2) and a width of 40.2 +/- 2.1 MeV/c(2). The exclusive production cross section comes out to be 22.27 +/- 0.89 +/- 1.56(-2.10)(+3.07) mu b. Angular distributions of the Sigma(1385)(+) in different reference frames are found to be compatible with the hypothesis that 33% of Sigma(1385)(+) result from the decay of an intermediate broad Delta(++) excitation at about 2000 MeV/c(2).

Baryonic resonances close to the K[over ¯]N threshold: The case of Σ(1385)^{+} in pp collisions

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

Abstract

We present results of an exclusive measurement of the first-excited state of the Sigma hyperon, Sigma(1385)(+), produced in p + p -> Sigma(+) + K+ + n at 3.5 GeV beam energy. The extracted data allow the detailed study of the invariant mass distribution of the Sigma(1385)(+). The mass distribution is well described by a relativistic Breit-Wigner function with a maximum at m(0) = 1383.2 +/- 0.9 MeV/c(2) and a width of 40.2 +/- 2.1 MeV/c(2). The exclusive production cross section comes out to be 22.27 +/- 0.89 +/- 1.56(-2.10)(+3.07) mu b. Angular distributions of the Sigma(1385)(+) in different reference frames are found to be compatible with the hypothesis that 33% of Sigma(1385)(+) result from the decay of an intermediate broad Delta(++) excitation at about 2000 MeV/c(2).
2012
85
035203-1
035203-11
G. Agakishiev;A. Balanda;D. Belver;A. Belyaev;J. Berger-Chen;A. Blanco;M. Böhmer;J. Boyard;P. Cabanelas;E. Castro;S. Chernenko;T. Christ;M. Destefanis;F. Dohrmann;A. Dybczak;E. Epple;L. Fabbietti;O. Fateev;P. Finocchiaro;P. Fonte;J. Friese;I. Fröhlich;T. Galatyuk;J. Garzón;R. Gernhäuser;C. Gilardi;M. Golubeva;D. González-Díaz;F. Guber;M. Gumberidze;T. Heinz;T. Hennino;R. Holzmann;A. Ierusalimov;I. Iori;A. Ivashkin;M. Jurkovic;B. Kämpfer;K. Kanaki;T. Karavicheva;I. Koenig;W. Koenig;B. Kolb;R. Kotte;A. Krása;F. Krizek;R. Krücken;H. Kuc;W. Kühn;A. Kugler;A. Kurepin;R. Lalik;S. Lang;J. Lange;K. Lapidus;T. Liu;L. Lopes;M. Lorenz;L. Maier;A. Mangiarotti;J. Markert;V. Metag;B. Michalska;J. Michel;E. Morinière;J. Mousa;C. Müntz;L. Naumann;J. Otwinowski;Y. 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;E. Schwab;J. Siebenson;Yu. Sobolev;S. Spataro;B. Spruck;H. Ströbele;J. Stroth;C. Sturm;A. Tarantola;K. Teilab;P. Tlusty;M. Traxler;R. Trebacz;H. Tsertos;V. Wagner;M. Weber;C. Wendisch;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/2318/104769
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