A measurement of the transverse polarization of Lambda-hyperons produced in inelastic pN-reactions at 450 GeV proton energy RID C-6551-2009 RID A-4071-2012

FANTI, VIVIANA;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;Grafstrom P;Kubischta W;Marzulli V;Kesseler G;Matheys JP;Norton A;Palestini S;Pazer 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;Blumer H;Buchholz P;Coward D;Ebersberger C;Kalter A;Kleinknecht K;Koch U;Kopke L;Leber F;Luitz S;Renk B;Scheidt J;Schmidt J;Schonharting V;Wilhelm R;Zeitnitz O;Chollet JC;Crepe 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;Mannelli I;Pierazzini G;Sozzi M;Cheze JB;De Beer M;Debu P;Mazzucato E;Peyaud B;Schanne S;Steinkamp O;Turlay R;Vallage B;Augustin I;Bender M;Holder M;Ziolkowski M;Arcidiacono R;Biino C;Govi G;Maas P;Marchetto F;Menichetti E;Dibon H;Jeitler M;Markytan M;Mikulec I;Neuhofer G;Pernicka M;Taurok A.

1999-01-01

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Abstract

A study of the polarization of Lambda hyperons produced in inelastic pN reactions induced by the 450 CeV proton beam from the CERN SPS has been performed with the NA48 detector. The Lambda 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 Lambda between 0.28 GeV/c and 0.86 GeV/c. The <(Lambda)over bar> polarization is consistent with zero.