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Subthreshold Xi- Production in Collisions of p(3.5 GeV)+Nb

G. Agakishiev O. Arnold A. Balanda D. Belver A. v. Belyaev J. c. Berger-Chen A. Blanco M. Böhmer J. l. Boyard 1 P. Cabanelas S. Chernenko A. Dybczak E. Epple L. Fabbietti O. v. Fateev P. Finocchiaro P. Fonte J. Friese I. Fröhlich T. Galatyuk J. a. Garzón R. Gernhäuser K. Göbel M. Golubeva D. González-Díaz F. Guber M. Gumberidze 1 T. Heinz T. Hennino 1 R. Holzmann A. Ierusalimov I. Iori A. Ivashkin M. Jurkovic B. Kämpfer T. Karavicheva I. Koenig W. Koenig B. w. Kolb G. Kornakov R. Kotte A. Krása F. Krizek R. Krücken H. Kuc 1 W. Kühn A. Kugler A. Kurepin V. Ladygin R. Lalik S. Lang K. Lapidus A. Lebedev T. Liu L. Lopes M. Lorenz L. Maier A. Mangiarotti J. Markert V. Metag B. Michalska J. Michel C. Müntz R. Müntzer L. Naumann Y. c. Pachmayer M. Palka Y. Parpottas V. Pechenov O. Pechenova J. Pietraszko W. Przygoda B. Ramstein 1 A. Reshetin A. Rustamov A. Sadovsky P. Salabura A. Schmah E. Schwab J. Siebenson Yu. g. Sobolev S. Spataro B. Spruck H. Ströbele J. Stroth C. Sturm A. Tarantola K. Teilab P. Tlusty M. Traxler R. Trebacz H. Tsertos T. Vasiliev V. Wagner M. Weber C. Wendisch J. Wüstenfeld S. Yurevich Y. v. Zanevsky
1 IPNO - Institut de Physique Nucléaire d'Orsay
Abstract : Results on the production of the double-strange cascade hyperon Ξ− are reported for collisions of p\,(3.5~GeV)\,+\,Nb, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18 at GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt. For the first time, subthreshold Ξ− production is observed in proton-nucleus interactions. Assuming a Ξ− phase-space distribution similar to that of Λ hyperons, the production probability amounts to PΞ−=(2.0±0.4(stat)±0.3(norm)±0.6(syst))×10−4 resulting in a Ξ−/(Λ+Σ0) ratio of PΞ−/ PΛ+Σ0=(1.2±0.3(stat)±0.4(syst))×10−2. Available model predictions are significantly lower than the estimated Ξ− yield.
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Submitted on : Monday, January 19, 2015 - 2:53:52 PM
Last modification on : Friday, April 30, 2021 - 10:21:52 AM

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G. Agakishiev, O. Arnold, A. Balanda, D. Belver, A. v. Belyaev, et al.. Subthreshold Xi- Production in Collisions of p(3.5 GeV)+Nb. Physical Review Letters, American Physical Society, 2015, 114 (21), pp.212301. ⟨10.1103/PhysRevLett.114.212301⟩. ⟨in2p3-01104937⟩

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