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A measurement of the transverse polarization of Λ-hyperons produced in inelastic pN-reactions at 450 GeV proton energy

  • Author(s): Fanti, V
  • Lai, A
  • Musa, L
  • Nappi, A
  • Setzu, MG
  • Moore, RW
  • Munday, DJ
  • Parker, MA
  • Takach, SF
  • White, TO
  • Barr, G
  • Bocquet, G
  • Bremer, J
  • Ceccucci, A
  • Cogan, J
  • Cundy, D
  • Doble, N
  • Fischer, G
  • Funk, W
  • Gatignon, L
  • Gianoli, A
  • Gonidec, A
  • Grafström, P
  • Kubischta, W
  • Marzulli, V
  • Kesseler, G
  • Matheys, JP
  • Norton, A
  • Palestini, S
  • Panzer-Steindel, B
  • Schinzel, D
  • Taureg, H
  • Velasco, M
  • Vossnack, O
  • Wahl, H
  • Kekelidze, V
  • Kojevnikov, I
  • Potrebenikov, Y
  • Hristov, P
  • Tatishvili, G
  • Tkatchev, A
  • Bertolotto, L
  • Boyle, O
  • Hay, B
  • McKay, NE
  • Oakland, G
  • Parsons, H
  • Peach, KJ
  • Talamonti, C
  • Walker, A
  • Dalpiaz, P
  • Duclos, J
  • Formica, A
  • Frabetti, PL
  • Martini, M
  • Petrucci, F
  • Porcu, M
  • Rossi, F
  • Savrie, M
  • Simani, C
  • Bizzeti, A
  • Calvetti, M
  • Lenti, M
  • Michetti, A
  • Becker, HG
  • Beier, T
  • Blümer, H
  • Buchholz, P
  • Coward, D
  • Ebersberger, C
  • Kalter, A
  • Kleinknecht, K
  • Koch, U
  • Köpke, L
  • Leber, F
  • Luitz, S
  • Renk, B
  • Scheidt, J
  • Schmidt, J
  • Schönharting, V
  • Wilhelm, R
  • Zeitnitz, O
  • Chollet, JC
  • Crépé, S
  • Fayard, L
  • Iconomidou-Fayard, L
  • Ocariz, J
  • Unal, G
  • Anzivino, G
  • Cenci, P
  • Lubrano, P
  • Pepe, M
  • et al.
Abstract

A study of the polarization of Λ hyperons produced in inelastic pN reactions induced by the 450 GeV proton beam from the CERN SPS has been performed with the NA48 detector. The Λ hyperons were detected at a fixed angle of 4.2 mrad in the momentum range from 50 GeV/c to 200 GeV/c. The polarization changes from -0.053 ± 0.034 to -0.298 ± 0.074 for a transverse momentum range of the Λ between 0.28 GeV/c and 0.86 GeV/c. The Λ̄ polarization is consistent with zero.

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