A measurement of $\lambda$ polarization in inclusive production by $\Sigma^{-}$ of 340 GeV/c in C and Cu targets
| Autor: | L. Rossi, M. Rey-Campagnolle, U. Dersch, E. Vesin, K. Martens, K. Vorwalter, S. G. Gerassimov, M. I. Adamovich, M. Buenerd, H. Rudolph, T. Haller, Bogdan Povh, W. Bruckner, E. Wittmann, P. Martin, W. Beusch, T. Walcher, J. Pochodzalla, M. Beck, P. Grafstrom, E. Hubbard, D. Barberis, R. Werding, S. Masciocchi, R. Michaels, G. Rosner, S. Brons, Mikhail Zavertyaev, O. Thilmann, Z. Ren, G. Walder, Jürgen Engelfried, K. Konigsmann, J. Chauvin, A. Simon, M. Boss, F. Charignon, D. Newbold, C. Newsom, C. Busch, N. Keller, V. Smith, Y. A. Alexandrov, A. Fournier, C. Scheel, R. Ransome, L. Schmitt, U. Muller, I. Konorov, H. W. Siebert, S. Paul, F. Dropmann, S. P. Baranov, M. Heidrich, R. B. Hurst, C. Berat, E. A. Chudakovc, I. K. Potashnikova, A. Trombini, B. Volkemer, F. Faller, C. Buscher, M. Godbersen, H. Neeb |
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| Přispěvatelé: | Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), WA89, Publica |
| Rok vydání: | 2004 |
| Předmět: |
Physics
Physics and Astronomy (miscellaneous) 010308 nuclear & particles physics 0103 physical sciences [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] Hyperon Sigma Atomic physics 010306 general physics Polarization (waves) Lambda 01 natural sciences Engineering (miscellaneous) |
| Zdroj: | European Physical Journal C: Particles and Fields European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2004, 32, pp.221-228. ⟨10.1140/epjc/s2003-01357-3⟩ |
| ISSN: | 1434-6052 1434-6044 |
| Popis: | We have measured the polarization of Λ\LambdaΛ hyperons produced inclusively by a Σ−\Sigma^-Σ− beam of 340 GeV/c momentum in nuclear targets. From a sample of 9.5 millions of identified Λ\LambdaΛ decays, polarizations were determined in the range xF>0.1x_F \gt 0.1xF>0.1 and pt≤1.6p_t\leq 1.6pt≤1.6 GeV/c . The polarization w.r.t. the production normal is mainly positive for xF≥0.3x_F \geq 0.3xF≥0.3. At fixed values of xFx_FxF, it increases with ptp_tpt to a maximum between pt=0.5p_t = 0.5pt=0.5 and pt=1p_t = 1pt=1 GeV/c , and then decreases to zero or even negative values, in sharp contrast to the plateau above pt=1p_t = 1pt=1 GeV/c observed in inclusive Λ\LambdaΛ production by protons. |
| Databáze: | OpenAIRE |
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