A measurement of lambda polarization in inclusive production by Sigma- of 340 GeV/c in C and Cu targets
- Adamovich, M.I.
- Alexandrov, Y.A.
- Baranov, S.P.
- Barberis, D.
- Beck, M.
- Bérat, C.
- Beusch, W.
- Boss, M.
- Brons, S.
- Brückner, W.
- Buénerd, M.
- Busch, C.
- Büscher, C.
- Charignon, F.
- Chauvin, J.
- Chudakov, E.A.
- Dersch, U.
- Dropmann, F.
- Engelfried, J.
- Faller, F.
- Fournier, A.
- Gerassimov, S.G.
- Godbersen, M.
- Grafström, P.
- Haller, T.
- Heidrich, M.
- Hubbard, E.
- Hurst, R.B.
- Königsmann, K.
- Konorov, I.
- Keller, N.
- Martens, K.
- Martin, P.
- Masciocchi, S.
- Michaels, R.
- Müller, U.
- Neeb, H.
- Newbold, D.
- Newsom, C.
- Paul, S.
- Pochodzalla, J.
- Potashnikova, I.
- Povh, B.
- Ransome, R.
- Ren, Z.
- Rey-Campagnolle, M.
- Rosner, G.
- Rossi, L.
- Rudolph, H.
- Scheel, C.
- Schmitt, L.
- Siebert, H.-W.
- Simon, A.
- Smith, V.
- Thilmann, O.
- Trombini, A.
- Vesin, E.
- Volkemer, B.
- Vorwalter, K.
- Walcher, T.
- Wälder, G.
- Werding, R.
- Wittmann, E.
- Zavertyaev, M.V.
Publication date
January 2004
DOIAbstract
We have measured the polarization of hyperons produced inclusively by a - beam of 340 GeV/c momentum in nuclear targets. From a sample of 9.5 millions of identified 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
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