<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>J</mml:mi><mml:mo stretchy="false">/</mml:mo><mml:mi>ψ</mml:mi></mml:math> polarization in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.gif" overflow="scroll"><mml:mi>p</mml:mi><mml:mo>+</mml:mo><mml:mi>p</mml:mi></mml:math> collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si3.gif" overflow="scroll"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>200</mml:mn><mml:mtext> GeV</mml:mtext></mml:math> in STAR
L. AdamczykAGH University of Science and Technology, Cracow, PolandJ. K. AdkinsUniversity of Kentucky, Lexington, KY 40506-0055, USAG. AgakishievJoint Institute for Nuclear Research, Dubna, 141 980, RussiaM. M. AggarwalPanjab University, Chandigarh 160014, IndiaZ. AhammedVariable Energy Cyclotron Centre, Kolkata 700064, IndiaI. AlekseevAlikhanov Institute for Theoretical and Experimental Physics, Moscow, RussiaJ. AlfordKent State University, Kent, OH 44242, USAC. AnsonOhio State University, Columbus, OH 43210, USAA. AparinJoint Institute for Nuclear Research, Dubna, 141 980, RussiaD. ArkhipkinBrookhaven National Laboratory, Upton, NY 11973, USAE. C. AschenauerBrookhaven National Laboratory, Upton, NY 11973, USAG. S. AverichevJoint Institute for Nuclear Research, Dubna, 141 980, RussiaJ. BalewskiMassachusetts Institute of Technology, Cambridge, MA 02139-4307, USAA. BanerjeeVariable Energy Cyclotron Centre, Kolkata 700064, IndiaZ. BarnovskaNuclear Physics Institute AS CR, 250 68 e/Prague, Czech RepublicD. R. BeavisBrookhaven National Laboratory, Upton, NY 11973, USAR. BellwiedUniversity of Houston, Houston, TX 77204, USAA. BhasinUniversity of Jammu, Jammu 180001, IndiaA. K. BhatiPanjab University, Chandigarh 160014, IndiaP. BhattaraiUniversity of Texas, Austin, TX 78712, USAH. BichselaAGH University of Science and Technology, Cracow, PolandJ. BielčíkaAGH University of Science and Technology, Cracow, PolandJ. BielčíkováaAGH University of Science and Technology, Cracow, PolandL. C. BlandaAGH University of Science and Technology, Cracow, PolandI. G. BordyuzhinAGH University of KrakowW. BorowskiaAGH University of Science and Technology, Cracow, PolandJ. BouchetKent State University, Kent, OH 44242, USAA. V. BrandinaAGH University of Science and Technology, Cracow, PolandS. G. BrovkoUniversity of California, Davis, CA 95616, USAS. BültmannaAGH University of Science and Technology, Cracow, PolandI. BunzarovaAGH University of Science and Technology, Cracow, PolandT. P. BurtonaAGH University of Science and Technology, Cracow, PolandJ. M. ButterworthaAGH University of Science and Technology, Cracow, PolandH. CainesaAGH University of Science and Technology, Cracow, PolandM. Calderon De La Barca SanchezaAGH University of Science and Technology, Cracow, PolandD. CebraUniversity of California, Davis, CA 95616, USAR. CendejasaAGH University of Science and Technology, Cracow, PolandM. C. CervantesaAGH University of Science and Technology, Cracow, PolandP. ChaloupkaCzech Technical University in Prague, FNSPE, Prague, 115 19, Czech RepublicZ. ChangaAGH University of Science and Technology, Cracow, PolandS. ChattopadhyayaAGH University of Science and Technology, Cracow, PolandH.F. ChenaAGH University of Science and Technology, Cracow, PolandJ.H. ChenaAGH University of Science and Technology, Cracow, PolandL. ChenaAGH University of Science and Technology, Cracow, PolandJ. ChengaAGH University of Science and Technology, Cracow, PolandM. CherneyCreighton University, Omaha, NE 68178, USAA. ChikanianaAGH University of Science and Technology, Cracow, PolandW. ChristieaAGH University of Science and Technology, Cracow, PolandJ. J. ChwastowskiaAGH University of Science and Technology, Cracow, PolandM. J. M. CodringtonaAGH University of Science and Technology, Cracow, PolandR. CorlissaAGH University of Science and Technology, Cracow, PolandJ. G. CrameraAGH University of Science and Technology, Cracow, PolandH. J. CrawfordUniversity of California, Berkeley, CA 94720, USAX.Y. CuiaAGH University of Science and Technology, Cracow, PolandS. DasInstitute of Physics, Bhubaneswar 751005, IndiaA. Davila LeyvaaAGH University of Science and Technology, Cracow, PolandL.C. De SilvaaAGH University of Science and Technology, Cracow, PolandR. R. DebbeBrookhaven National Laboratory, Upton, NY 11973, USAT. G. DedovichaAGH University of Science and Technology, Cracow, PolandJ. DengaAGH University of Science and Technology, Cracow, PolandA. A. DerevschikovaAGH University of Science and Technology, Cracow, PolandR. Derradi de SouzaUniversidade Estadual de Campinas, Sao Paulo, BrazilS. DhamijaIndiana University, Bloomington, IN 47408, USAB. Di RuzzaBrookhaven National Laboratory, Upton, NY 11973, USAL. DidenkoBrookhaven National Laboratory, Upton, NY 11973, USAC. DilksPennsylvania State University, University Park, PA 16802, USAF. DingaAGH University of Science and Technology, Cracow, PolandP. DjawothoaAGH University of Science and Technology, Cracow, PolandX. DongLawrence Berkeley National Laboratory, Berkeley, CA 94720, USAJ. L. DrachenbergaAGH University of Science and Technology, Cracow, PolandJ. E. DraperaAGH University of Science and Technology, Cracow, PolandC. M. DuaAGH University of Science and Technology, Cracow, PolandL. E. DunkelbergeraAGH University of Science and Technology, Cracow, PolandJ. C. DunlopaAGH University of Science and Technology, Cracow, PolandL. G. EfimovaAGH University of Science and Technology, Cracow, PolandJ. EngelageaAGH University of Science and Technology, Cracow, PolandK. S. EngleaAGH University of Science and Technology, Cracow, PolandG. EppleyaAGH University of Science and Technology, Cracow, PolandL. EunaAGH University of Science and Technology, Cracow, PolandO. EvdokimovaAGH University of Science and Technology, Cracow, PolandR. FatemiaAGH University of Science and Technology, Cracow, PolandS. FazioaAGH University of Science and Technology, Cracow, PolandJ. FedorišinaAGH University of Science and Technology, Cracow, PolandP. FilipJoint Institute for Nuclear Research, Dubna, 141 980, RussiaE. FinchaAGH University of Science and Technology, Cracow, PolandY. FisyakaAGH University of Science and Technology, Cracow, PolandC. E. FloresUniversity of California, Davis, CA 95616, USAC. A. GagliardiaAGH University of Science and Technology, Cracow, PolandD. R. GangadharanaAGH University of Science and Technology, Cracow, PolandD. GarandaAGH University of Science and Technology, Cracow, PolandF. J. M. GeurtsaAGH University of Science and Technology, Cracow, PolandS. M. GibsonaAGH University of Science and Technology, Cracow, PolandM. GirardaAGH University of Science and Technology, Cracow, PolandS. GliskeaAGH University of Science and Technology, Cracow, PolandD. GrosnickaAGH University of Science and Technology, Cracow, PolandY. GuoaAGH University of Science and Technology, Cracow, PolandA. GuptaaAGH University of Science and Technology, Cracow, PolandS. K. GuptaaAGH University of Science and Technology, Cracow, PolandW. GurynaAGH University of Science and Technology, Cracow, PolandB. HaagMassachusetts Institute of Technology, Cambridge, MA 02139-4307, USA
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We report on a polarization measurement of inclusive J / mesons in the di-electron decay channel at mid-rapidity at 2 < p T < 6 GeV/c in p + p collisions at s = 200 GeV. Data were taken with the STAR detector at RHIC. The J / polarization measurement should help to distinguish between different models of the J / production mechanism since they predict different p T dependences of the J / polarization. In this analysis, J / polarization is studied in the
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