A measurement of λ polarization in inclusive production by ∑<sup>-</sup> of 340 GeV/c in C and Cu targets
- Adamovich, M.
- Alexandrov, Y.
- Baranov, S.
- Barberis, D.
- Beck, M.
- Berat, C.
- Beusch, W.
- Boss, M.
- Brons, S.
- Bruckner, W.
- Buenerd, M.
- Busch, C.
- Buscher, C.
- Charignon, F.
- Chauvin, J.
- Chudakovc, E.
- Dersch, U.
- Dropmann, F.
- Engelfried, J.
- Faller, F.
- Fournier, A.
- Gerassimov, S.
- Godbersen, M.
- Grafstrom, P.
- Haller, T.
- Heidrich, M.
- Hubbard, E.
- Hurst, R.
- Konigsmann, K.
- Konorov, I.
- Keller, N.
- Martens, K.
- Martin, P.
- Masciocchi, S.
- Michaels, R.
- Muller, 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.
- Simon, A.
- Smith, V.
- Thilmann, O.
- Trombini, A.
- Vesin, E.
- Volkemer, B.
- Vorwalter, K.
- Walcher, T.
- Walder, G.
- Werding, R.
- Wittmann, E.
- Zavertyaev, M.
Publication date
April 2004
DOI Publisher
Springer Science and Business Media LLCAbstract
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 > 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
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