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          Institute: MPI für Kernphysik     Collection: Heavy Flavour Physics     Display Documents



  history
ID: 284625.0, MPI für Kernphysik / Heavy Flavour Physics
Polarization of Λ and Λ overbar in 920 GeV fixed-target proton–nucleus collisions
Authors:Abt, I.; Adams, M.; Albrecht, H.; Amaral, V.; Amorim, A.; Aplin, S. J.; Aushev, V.; Bagaturia, Y.; Balagura, V.; Bargiotti, M.; Barsukova, O.; Bastos, J.; Bauer, C.; Bauer, T. S.; Belkov, A.; Belkov, Ar; Bertin, A.; Bobchenko, B.; Boecker, M.; Bogatyrev, A.; Bohm, G.; Braeuer, M.; Bruinsma, M.; Bruschi, M.; Buchholz, P.; Buran, T.; Carvalho, J.; Conde, P.; Cruse, C.; Dam, M.; Danielsen, K. M.; Danilov, M.; De Castro, S.; Deppe, H.; Dong, X.; Dreis, H. B.; Egorytchev, V.; Ehret, K.; Eisele, F.; Emeliyanov, D.; Essenov, S.; Fabbri, L.; Faccioli, P.; Feuerstack-Raible, M.; Flammer, J.; Fominykh, B.; Funcke, M.; Garrido, L.; Giacobbe, B.; Glaess, J.; Goloubkov, D.; Goloubkov, Y.; Golutvin, A.; Golutvin, I.; Gorbounov, I.; Gorisek, A.; Gouchtchine, O.; Goulart, D. C.; Gradl, S.; Gradl, W.; Guilitsky, Y.; Hansen, J. D.; Hernandez, J. M.; Hofmann, W.; Hott, T.; Hulsbergen, W.; Husemann, U.; Igonkina, O.; Ispiryan, M.; Jagla, T.; Jiang, C.; Kapitza, H.; Karabekyan, S.; Karpenko, N.; Keller, S.; Khasanov, F.; Kiryushin, Y.; Knöpfle, K. T.; Kolanoski, H.; Korpar, S.; Krauss, C.; Kreuzer, P.; Krizan, P.; Kruecker, D.; Kvaratskheliia, T.; Lanyov, A.; Lau, K.; Lewendel, B.; Lohse, T.; Maenner, R.; Masciocchi, S.; Massa, I.; Matchikhilian, L.; Medin, G.; Medinnis, M.; Mevius, M.; Michetti, A.; Mikhailov, Y.; Mizuk, R.; Muresan, R.; Negodaev, M.; Noerenberg, M.; Nowak, S.; Nunez Pardo de Vera, M. T.; Ouchrif, M.; Ould-Saada, F.; Padilla, C.; Peralta, D.; Pernack, R.; Pestotnik, R.; Piccinini, M.; Pleier, M. A.; Poli, M.; Popov, V.; Pose, D.; Pugatch, V.; Pylypchenko, Y.; Pyrlik, J.; Reeves, K.; Ressing, D.; Riu, I.; Robmann, P.; Rybnikov, V.; Sanchez, F.; Sbrizzi, A.; Schmelling, M.; Schmidt, B.; Schreiner, A.; Schroeder, H.; Schwartz, A. J.; Schwarz, A. S.; Schwenninger, B.; Schwingenheuer, B.; Sciacca, F.; Semprini-Cesari, N.; Shuvalov, S.; Sozuer, L.; Solunin, S.; Somov, A.; Somov, S.; Spengler, J.; Spighi, R.; Spiridonov, A.; Stanovnik, A.; Staric, M.; Stegmann, C.; Symalla, M.; Tikhomirov, I.; Titov, M.; Tsakov, I.; Uwer, U.; van Eldik, C.; Vassiliev, Y.; Villa, M.; Vitale, A.; Vukotic, I.; Wahlberg, H.; Walenta, A. H.; Walter, M.; Wang, J. J.; Wegener, D.; Werthenbach, U.; Wolters, H.; Wurth, R.; Wurz, A.; Zaitsev, Y.; Zavertyaev, M.; Zeuner, T.; Zhelezov, A.; Zheng, Z.; Zimmermann, R.; Zivko, T.; Zoccoli, A.; Aleksandrov, A.; Batista, J.; Grimaldi, F.; Kessler, J.; Kupper, S.; zur Nedden, M.; Prystupa, S.; Rick, H.; Rostovtseva, I.; Silva, L.; Subramania, H. S.; Lomonosov, B.; Agari, Michaela; Belotelov, I.; Erhan, S.; Gellrich, A.; Hohlmann, M.; Kisel, I.; Klinkby, E.; Mankel, R.; Petersen, B.; Schwanke, U.
Language:English
Corporate body:I. Abt et al. for the HERA-B Collaboration
Research Context:HERA-B
Date of Publication (YYYY-MM-DD):2006-07-20
Title of Journal:Physics Letters B
Journal Abbrev.:Phys.Lett.B
Volume:638
Issue / Number:5-6
Start Page:415
End Page:421
Copyright:Elsevier B.V.
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:A measurement of the polarization of Λ and baryons produced in pC and pW collisions at has been performed with the HERA-B spectrometer. The measurements cover the kinematic range of 0.6 GeV/c<p<1.2 GeV/c in transverse momentum and −0.15<xF<0.01 in Feynman-x. The polarization results from the two different targets agree within the statistical error. In the combined data set, the largest deviation from zero, +0.054±0.029, is measured for xF−0.07. Zero polarization is expected at xF=0 in the absence of nuclear effects. The polarization results for the Λ agree with a parametrization of previous measurements which were performed at positive xF values, where the Λ polarization is negative. Results of polarization measurements are consistent with zero. A measurement of the polarization of Λ and baryons produced in pC and pW collisions at has been performed with the HERA-B spectrometer. The measurements cover the kinematic range of 0.6 GeV/c<p<1.2 GeV/c in transverse momentum and −0.15<xF<0.01 in Feynman-x. The polarization results from the two different targets agree within the statistical error. In the combined data set, the largest deviation from zero, +0.054±0.029, is measured for xF−0.07. Zero polarization is expected at xF=0 in the absence of nuclear effects. The polarization results for the Λ agree with a parametrization of previous measurements which were performed at positive xF values, where the Λ polarization is negative. Results of polarization measurements are consistent with zero.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group W. Hofmann/Heavy Flavour Physics (K. T. Knöpfle, M. Schmelling)
External Affiliations:NIKHEF, 1009 DB Amsterdam, The Netherlands7
Department ECM, Faculty of Physics, University of Barcelona, E-08028 Barcelona, Spain8
Institute for High Energy Physics, Beijing 100039, PR China
Institute of Engineering Physics, Tsinghua University, Beijing 100084, PR China
Institut für Physik, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany910
Dipartimento di Fisica dell'Università di Bologna and INFN Sezione di Bologna, I-40126 Bologna, Italy
Department of Physics, University of Cincinnati, Cincinnati, OH 45221, USA11
LIP Coimbra, P-3004-516 Coimbra, Portugal12
Niels Bohr Institutet, DK-2100 Copenhagen, Denmark13
Institut für Physik, Universität Dortmund, D-44221 Dortmund, Germany10
Joint Institute for Nuclear Research Dubna, 141980 Dubna, Moscow region, Russia
DESY, D-22603 Hamburg, Germany
Physikalisches Institut, Universität Heidelberg, D-69120 Heidelberg, Germany10
Department of Physics, University of Houston, Houston, TX 77204, USA11
Institute for Nuclear Research, Ukrainian Academy of Science, 03680 Kiev, Ukraine14
J. Stefan Institute, 1001 Ljubljana, Slovenia15
University of Ljubljana, 1001 Ljubljana, Slovenia
University of California, Los Angeles, CA 90024, USA16
Lehrstuhl für Informatik V, Universität Mannheim, D-68131 Mannheim, Germany
University of Maribor, 2000 Maribor, Slovenia
Institute of Theoretical and Experimental Physics, 117259 Moscow, Russia17
Max-Planck-Institut für Physik, Werner-Heisenberg-Institut, D-80805 München, Germany10
Department of Physics, University of Oslo, N-0316 Oslo, Norway18
Fachbereich Physik, Universität Rostock, D-18051 Rostock, Germany10
Fachbereich Physik, Universität Siegen, D-57068 Siegen, Germany10
Institute for Nuclear Research, INRNE-BAS, Sofia, Bulgaria
Universiteit Utrecht/NIKHEF, 3584 CB Utrecht, The Netherlands7
DESY, D-15738 Zeuthen, Germany
Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland19
Physics Department, CERN, Geneve 1211, Switzerland

NIKHEF, 1009 DB Amsterdam, The Netherlands7
Department ECM, Faculty of Physics, University of Barcelona, E-08028 Barcelona, Spain8
Institute for High Energy Physics, Beijing 100039, PR China
Institute of Engineering Physics, Tsinghua University, Beijing 100084, PR China
Institut für Physik, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany910
Dipartimento di Fisica dell'Università di Bologna and INFN Sezione di Bologna, I-40126 Bologna, Italy
Department of Physics, University of Cincinnati, Cincinnati, OH 45221, USA11
LIP Coimbra, P-3004-516 Coimbra, Portugal12
Niels Bohr Institutet, DK-2100 Copenhagen, Denmark13
Institut für Physik, Universität Dortmund, D-44221 Dortmund, Germany10
Joint Institute for Nuclear Research Dubna, 141980 Dubna, Moscow region, Russia
DESY, D-22603 Hamburg, Germany
Physikalisches Institut, Universität Heidelberg, D-69120 Heidelberg, Germany10
Department of Physics, University of Houston, Houston, TX 77204, USA11
Institute for Nuclear Research, Ukrainian Academy of Science, 03680 Kiev, Ukraine14
J. Stefan Institute, 1001 Ljubljana, Slovenia15
University of Ljubljana, 1001 Ljubljana, Slovenia
University of California, Los Angeles, CA 90024, USA16
Lehrstuhl für Informatik V, Universität Mannheim, D-68131 Mannheim, Germany
University of Maribor, 2000 Maribor, Slovenia
Institute of Theoretical and Experimental Physics, 117259 Moscow, Russia17
Max-Planck-Institut für Physik, Werner-Heisenberg-Institut, D-80805 München, Germany10
Department of Physics, University of Oslo, N-0316 Oslo, Norway18
Fachbereich Physik, Universität Rostock, D-18051 Rostock, Germany10
Fachbereich Physik, Universität Siegen, D-57068 Siegen, Germany10
Institute for Nuclear Research, INRNE-BAS, Sofia, Bulgaria
Universiteit Utrecht/NIKHEF, 3584 CB Utrecht, The Netherlands7
DESY, D-15738 Zeuthen, Germany
Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland19
Physics Department, CERN, Geneve 1211, Switzerland
Identifiers:DOI:http://dx.doi.org/10.1016/j.physletb.2006.05.040ht...
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