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Title	A measurement of $\Lambda$ polarization in inclusive production by $\Sigma^-$ of 340-GeV/c in C and Cu targets
Author(s)	Adamovich, M I (LPI, Moscow (main)) ; Alexandrov, Yu A (LPI, Moscow (main)) ; Baranov, S P (LPI, Moscow (main)) ; Barberis, D (Genoa U. ; INFN, Genoa) ; Beck, M (Heidelberg, Max Planck Inst.) ; ́erat, C B (Grenoble, CEN) ; Beusch, W (CERN) ; Boss, M (Heidelberg U.) ; Brons, S (Heidelberg, Max Planck Inst.) ; Brückner, W (Heidelberg, Max Planck Inst.) ; ́enerd, M Bu (Grenoble, CEN) ; Busch, Ch (Heidelberg U.) ; ̈uscher, Ch B (Heidelberg U.) ; Charignon, F (Grenoble, CEN) ; Chauvin, J (Grenoble, CEN) ; Chudakov, E A (Heidelberg U.) ; Dersch, U (Heidelberg, Max Planck Inst.) ; Dropmann, F (Heidelberg, Max Planck Inst.) ; Engelfried, J (Heidelberg, Max Planck Inst.) ; Faller, F (Heidelberg U.) ; Fournier, A (Grenoble, CEN) ; Gerassimov, S G (LPI, Moscow (main)) ; Godbersen, M (Heidelberg, Max Planck Inst.) ; ̈om, P Grafstr (CERN) ; Haller, Th (Heidelberg, Max Planck Inst.) ; Heidrich, M (Heidelberg, Max Planck Inst.) ; Hubbard, E (Heidelberg, Max Planck Inst.) ; Hurst, R B (Genoa U. ; INFN, Genoa) ; ̈onigsmann, K K (Heidelberg, Max Planck Inst.) ; Konorov, I (Heidelberg, Max Planck Inst. ; LPI, Moscow (main)) ; Keller, N (Heidelberg U.) ; Martens, K (Heidelberg U.) ; Martin, Ph (Grenoble, CEN) ; Masciocchi, S (Heidelberg, Max Planck Inst.) ; Michaels, R (Heidelberg, Max Planck Inst.) ; Müller, U (Mainz U.) ; Neeb, H (Heidelberg, Max Planck Inst.) ; Newbold, D (U. Bristol (main)) ; Newsom, C (U. Iowa, Iowa City) ; Paul, S (Heidelberg, Max Planck Inst.) ; Pochodzalla, J (Heidelberg, Max Planck Inst.) ; Potashnikova, I (Heidelberg, Max Planck Inst.) ; B Povh (Heidelberg, Max Planck Inst.) ; Ransome, R (Rutgers U., Piscataway (main)) ; Z Ren (Heidelberg, Max Planck Inst.) ; Rey-Campagnolle, M (Grenoble, CEN) ; Rosner, G (Mainz U., Inst. Kernphys.) ; Rossi, L (Genoa U. ; INFN, Genoa) ; Rudolph, H (Mainz U., Inst. Kernphys.) ; Scheel, C (Nikhef, Amsterdam) ; Schmitt, L (Mainz U., Inst. Kernphys.) ; Siebert, H -W (Heidelberg U.) ; Simon, A (Heidelberg U.) ; Smith, V (U. Bristol (main)) ; Thilmann, O (Heidelberg U.) ; Trombini, A (Heidelberg, Max Planck Inst.) ; Vesin, E (Grenoble, CEN) ; Volkemer, B (Mainz U., Inst. Kernphys.) ; Vorwalter, K (Heidelberg, Max Planck Inst.) ; Walcher, Th (Mainz U., Inst. Kernphys.) ; ̈alder, G W (Heidelberg U.) ; Werding, R (Heidelberg, Max Planck Inst.) ; Wittmann, E ; Zavertyaev, M V
Collaboration	WA89
Publication	2003
Imprint	2004
Number of pages	8
In:	Eur. Phys. J. C 32 (2004) 221-228
DOI	10.1140/epjc/s2003-01357-3
Subject category	Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN SPS ; WA89
Abstract	We have measured the polarization of $\Lambda$ hyperons produced inclusively by a $\Sigma^-$ beam of 340 GeV/c momentum in nuclear targets. From a sample of 9.5 millions of identified $\Lambda$ decays, polarizations were determined in the range $x_F \gt 0.1$ and $p_t\leq 1.6$ GeV/c . The polarization w.r.t. the production normal is mainly positive for $x_F \geq 0.3$. At fixed values of $x_F$, it increases with $p_t$ to a maximum between $p_t = 0.5$ and $p_t = 1$ GeV/c , and then decreases to zero or even negative values, in sharp contrast to the plateau above $p_t = 1$ GeV/c observed in inclusive $\Lambda$ production by protons.

Corresponding record in: Inspire