Open Access

Antoni Aduszkiewicz, Evgeny V. Andronov, Tome Antičić, Vadim A. Babkin, Mateusz Baszczyk, S. Bhosale, A. Blondel, Mariyan Bogomilov, Andrei V. Brandin, Alessandro Bravar, Wojciech Bryliński, Janusz Brzychczyk, M. Buryakov, O. Busygina, A. Bzdak, H. Cherif, M. Ćirković, Máté Csanád, J. Cybowska, T. Czopowicz, A. Damyanova, N. Davis, M. Deliyergiyev, Michael Deveaux, A. Dmitriev, W. Dominik, Piotr Dorosz, J. Dumarchez, Ralph Engel, Grigori A. Feofilov, L. Fields, Zoltán Fodor, A. Garibov, Marek Gaździcki, Oleg Golosov, V. Golovatyuk, Marina Golubeva, Katarzyna Grebieszkow, Fedor Guber, A. Haesler, Sergey N. Igolkin, Stoyanka Ilieva, Alexander Ivashkin, S. R. Johnson, Krešo Kadija, N. Kargin, E. Kashirin, Mirosław Kiełbowicz, Viktar A. Kireyeu, Viktor Klochkov, Vadim I. Kolesnikov, D. Kolev, A. Korzenev, V. N. Kovalenko, S. Kowalski, Michal Koziel, A. Krasnoperov, Wojciech Kucewicz, M. Kuich, Alexander Kurepin, Dag Toppe Larsen, A. László, Tatiana V. Lazareva, M. Lewicki, K. Łojek, V. V. Lyubushkin, Maja Maćkowiak-Pawłowska, Zbigniew Majka, Bartosz Maksiak, Aleksandr I. Malakhov, A. Marcinek, A. D. Marino, K. Marton, H.-J. Mathes, Tomasz Matulewicz, V. Matveev, Georgy L. Melkumov, Anastasia O. Merzlaya, B. Messerly, Łukasz Mik, Sergey Morozov, Stanislaw Mrówczyński, Y. Nagai, Michał Naskręt, Vitalii Ozvenchuk, V. Paolone, Oleg Petukhov, Roman Płaneta, P. Podlaski, B. A. Popov, B. Porfy, M. Posiadała-Zezula, D. S. Prokhorova, Damian Pszczel, Szymon Puławski, Jovan Puzović, M. Ravonel, Rainer Arno Ernst Renfordt, Dieter Röhrich, E. Rondio, M. Roth, Brant T. Rumberger, M. Rumyantsev, Anar Rustamov, Maciej Rybczyński, Andrzej Rybicki, Alexander Sadovsky, K. Schmidt, Ilya Selyuzhenkov, A. Yu. Seryakov, Peter Seyboth, M. Słodkowski, P. Staszel, Grzegorz Stefanek, J. Stepaniak, Michail Nikolaevič Strichanov, Herbert Ströbele, Tatjana Šuša, Arkadiy Taranenko, A. Tefelska, Dariusz Tefelski, V. Tereshchenko, Alberica Toia, R. Tsenov, L. Turko, R. Ulrich, M. Unger, Denis Uzhva, F. F. Valiev, Darko Veberič, V. V. Vechernin, A. Wickremasinghe, Zbigniew Włodarczyk, K. Wojcik, Oskar Wyszyński, E. D. Zimmerman, Robert Zwaska

• The production of Ξ(1321)− and Ξ¯¯¯¯(1321)+ hyperons in inelastic p+p interactions is studied in a fixed target experiment at a beam momentum of 158 GeV/c. Double differential distributions in rapidity y and transverse momentum pT are obtained from a sample of 33M inelastic events. They allow to extrapolate the spectra to full phase space and to determine the mean multiplicity of both Ξ− and Ξ¯¯¯¯+. The rapidity and transverse momentum spectra are compared to transport model predictions. The Ξ− mean multiplicity in inelastic p+p interactions at 158 GeV/c is used to quantify the strangeness enhancement in A+A collisions at the same centre-of-mass energy per nucleon pair.