A measurement of Λ polarization in inclusive production by Σ- of 340 GeV/c in C and Cu targets

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

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Abstract

We have measured the polarization of Λ hyperons produced inclusively by a Σ- beam of 340 GeV/c momentum in nuclear targets. From a sample of 9.5 millions of identified Λ decays, polarizations were determined in the range xF > 0.1 and p t < 1.6 GeV/c. The polarization w.r.t. the production normal is mainly positive for xF ≥ 0.3. At fixed values of xF, it increases with pt to a maximum between pt=0.5 and pt=1 GeV/c, and then decreases to zero or even negative values, in sharp contrast to the plateau above pt=1 GeV/c observed in inclusive A production by protons.

Original languageEnglish
Pages (from-to)221-228
Number of pages8
JournalEuropean Physical Journal C
Volume32
Issue number2
DOIs
StatePublished - Jan 2004
Externally publishedYes

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