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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;
  • Calafiura, P;
  • Carosi, R;
  • Casali, R;
  • Cerri, C;
  • Costantini, F;
  • Fantechi, R;
  • Giudici, S;
  • Gorini, B
  • 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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