Production of $V^0$ pairs in the hyperon experiment WA89

M.I. Adamovich , Yu.A. Alexandrov , S.P. Baranov , D. Barberis , M. Beck , C. Bérat (1) , W. Beusch , M. Boss , S. Brons , W. Brückner , M. Buénerd (1) , C. Busch , C. Büscher , F. Charignon (1) , J. Chauvin (1) , E.A. Chudakov , U. Dersch , F. Dropmann , J. Engelfried , F. Faller , A. Fournier (1) , S.G. Gerassimov , M. Godbersen , P. Grafström , T. Haller , M. Heidrich , E. Hubbard , R.B. Hurst , K. Königsmann , I. Konorov , S. Kovalenko , N. Keller , K. Martens , P. Martin (1) , S. Masciocchi , R. Michaels , U. Müller , H. Neeb , D. Newbold , C. Newsom , S. Paul , J. Pochodzalla , I. Potashnikova , B. Povh , Zhuoxiang Ren , M. Rey-Campagnolle (1, 2) , G. Rosner , L. Rossi , H. Rudolph , C. Scheel , L. Schmitt , H.-W. Siebert , A. Simon , V. Smith , O. Thilmann , A. Trombini , E. Vesin (1) , B. Volkemer , K. Vorwalter , T. Walcher , G. Wälder , R. Werding , E. Wittmann , M.V. Zavertyaev

1 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
2 CERN - European Organization for Nuclear Research

We present a comprehensive study of the inclusive production of $V^{0}V^{0}$ pairs ($V^{0}=\Lambda, \bar\Lambda or K_S$) by $\Sigma^-$ and $\pi^-$ of 340 GeV/c momentum and neutrons of 260 GeV/c mean momentum in copper and carbon targets. In particular, the dependence of the $x_F$ spectra on the combination of beam-particle and produced $V^{0}V^{0}$ pair is investigated and compared to predictions obtained from PYTHIA and QSGM calculations. The data and these predictions differ in many details, the agreement can at best be termed as qualitative. A signal from decays of the tensor meson $f'_2$(1525) was observed in the K_S K_S mass distribution and inclusive production cross sections were measured. No signal was found from the double-strange H-dibaryon decaying to $\Lambda \Lambda$.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]

M.I. Adamovich, Yu.A. Alexandrov, S.P. Baranov, D. Barberis, M. Beck, et al.. Production of $V^0$ pairs in the hyperon experiment WA89. European Physical Journal C: Particles and Fields, 2007, 52, pp.857-874. ⟨10.1140/epjc/s10052-007-0436-y⟩. ⟨in2p3-00180830⟩