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Measurement of the longitudinal spin transfer to Λ and barΛ hyperons in polarised muon DIS

  • M. Alekseev
  • , V. Yu Alexakhin
  • , Yu Alexandrov
  • , G. D. Alexeev
  • , A. Amoroso
  • , A. Austregesilo
  • , B. Badełek
  • , F. Balestra
  • , J. Ball
  • , J. Barth
  • , G. Baum
  • , Y. Bedfer
  • , J. Bernhard
  • , R. Bertini
  • , M. Bettinelli
  • , R. Birsa
  • , J. Bisplinghoff
  • , P. Bordalo
  • , F. Bradamante
  • , A. Bravar
  • A. Bressan, G. Brona, E. Burtin, M. P. Bussa, A. Chapiro, M. Chiosso, S. U. Chung, A. Cicuttin, M. Colantoni, M. L. Crespo, S. Dalla Torre, T. Dafni, S. Das, S. S. Dasgupta, O. Yu Denisov, L. Dhara, V. Diaz, A. M. Dinkelbach, S. V. Donskov, N. Doshita, V. Duic, W. Dünnweber, A. Efremov, P. D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, H. Fischer, C. Franco, J. M. Friedrich, R. Garfagnini, F. Gautheron, O. P. Gavrichtchouk, R. Gazda, S. Gerassimov, R. Geyer, M. Giorgi, B. Gobbo, S. Goertz, S. Grabmüller, O. A. Grajek, A. Grasso, B. Grube, R. Gushterski, A. Guskov, F. Haas, D. Von Harrach, T. Hasegawa, J. Heckmann, F. H. Heinsius, M. Hermann, R. Hermann, F. Herrmann, C. He, F. Hinterberger, N. Horikawa, Ch Höppner, N. D'Hose, C. Ilgner, S. Ishimoto, O. Ivanov, Yu Ivanshin, B. Iven, T. Iwata, R. Jahn, P. Jasinski, G. Jegou, R. Joosten, E. Kabu, D. Kang, B. Ketzer, G. V. Khaustov, Yu A. Khokhlov, Yu Kisselev, F. Klein, K. Klimaszewski, S. Koblitz, J. H. Koivuniemi, V. N. Kolosov, E. V. Komissarov, K. Kondo, K. Königsmann, R. Konopka, I. Konorov, V. F. Konstantinov, A. Korzenev, A. M. Kotzinian, O. Kouznetsov, K. Kowalik, M. Krämer, A. Kral, Z. V. Kroumchtein, R. Kuhn, F. Kunne, K. Kurek, J. M. Le Goff, A. A. Lednev, A. Lehmann, S. Levorato, J. Lichtenstadt, T. Liska, A. Maggiora, M. Maggiora, A. Magnon, G. K. Mallot, A. Mann, C. Marchand, J. Marroncle, A. Martin, J. Marzec, F. Massmann, T. Matsuda, A. N. Maximov, W. Meyer, T. Michigami, Yu V. Mikhailov, M. A. Moinester, A. Mutter, A. Nagaytsev, T. Nagel, J. Nassalski, S. Negrini, F. Nerling, S. Neubert, D. Neyret, V. I. Nikolaenko, A. G. Olshevsky, M. Ostrick, A. Padee, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, B. Pawlukiewicz-Kaminska, E. Perevalova, G. Pesaro, D. V. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V. A. Polyakov, G. Pontecorvo, J. Pretz, C. Quintans, J. F. Rajotte, S. Ramos, V. Rapatsky, G. Reicherz, D. Reggiani, A. Richter, F. Robinet, E. Rocco, E. Rondio, D. I. Ryabchikov, V. D. Samoylenko, A. Sandacz, H. Santos, M. G. Sapozhnikov, S. Sarkar, G. Sbrizzai, P. Schiavon, C. Schill, L. Schmitt, W. Schröder, O. Yu Shevchenko, H. W. Siebert, L. Silva, L. Sinha, A. N. Sissakian, M. Slunecka, G. I. Smirnov, S. Sosio, F. Sozzi, A. Srnka, M. Stolarski, M. Sulc, R. Sulej, S. Takekawa, S. Tessaro, F. Tessarotto, A. Teufel, L. G. Tkatchev, G. Venugopal, M. Virius, N. V. Vlassov, A. Vossen, Q. Weitzel, R. Windmolders, W. Wiślicki, H. Wollny, K. Zaremba, E. Zemlyanichkina, M. Ziembicki, J. Zhao, N. Zhuravlev, A. Zvyagin
  • University of Eastern Piedmont
  • Joint Inst. for Nuclear Research
  • P.N. Lebedev Physical Institute of the Russian Academy of Sciences
  • University of Torino
  • European Organization for Nuclear Research
  • Technical University of Munich
  • University of Warsaw
  • CEA Saclay
  • Rheinische Friedrich-Wilhelms-Universität Bonn
  • Universität Bielefeld
  • Johannes Gutenberg University
  • Ludwig-Maximilians-Universität München
  • INFN- Sezione di Trieste
  • LIP - Lisboa
  • University of Trieste Via A
  • INFN Sez. di Torino
  • Matrivani Institute of Experimental Research & Education
  • Burdwan University
  • Institute for High Energy Physics (IHEP)
  • Max-Planck-lnstitut für Kohlenforschung
  • Yamagata University
  • Friedrich-Alexander Universitat Erlangen-Nurnberg (FAU)
  • Charles University in Prague
  • Albert-Ludwigs-Universität Freiburg
  • University of Miyazaki
  • Nagoya University
  • Chubu University
  • Czech Technical University in Prague
  • Tel Aviv University
  • Warsaw Institute of Technology
  • Technical University of Liberec
  • ISEG-Technical University of Lisbon
  • Institute of Scientific Instruments of the Academy of Sciences of the Czech Republic

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

The longitudinal polarisation transfer from muons to Λ and \bar\Λ hyperons, DLLΛ(barΛ),has been studied in deep-inelastic scattering off an unpolarised isoscalar target at the COMPASS experiment at CERN. The spin transfers to Λ and barΛ produced in the current fragmentation region exhibit different behaviours as a function of x and x F. The measured x and x F dependences of D LL Λ are compatible with zero, while D LLbarΛ tends to increase with x F, reaching values of 0.4-0.5. The resulting average values are D LL Λ = -0.012±0.047±0.024 and DLLbarΛ = 0.249±0.056±0.049. These results are discussed in the frame of recent model calculations.

Original languageEnglish
Article number171
Pages (from-to)171-179
Number of pages9
JournalEuropean Physical Journal C
Volume64
Issue number2
DOIs
StatePublished - Nov 2009

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