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A measurement of $\Lambda$ polarization in inclusive production by $\Sigma^{-}$ of 340 GeV/c in C and Cu targets

Abstract : 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.
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http://hal.in2p3.fr/in2p3-00020277
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Submitted on : Wednesday, January 21, 2004 - 9:14:21 AM
Last modification on : Thursday, December 16, 2021 - 4:53:08 PM

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M.I. Adamovich, Yu.A. Alexandrov, S.P. Baranov, D. Barberis, M. Beck, et al.. A measurement of $\Lambda$ polarization in inclusive production by $\Sigma^{-}$ of 340 GeV/c in C and Cu targets. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2004, 32, pp.221-228. ⟨10.1140/epjc/s2003-01357-3⟩. ⟨in2p3-00020277⟩

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