Phys. Rev. Lett.
75,
3073–3077
(1995)
Analyzing Power Measurement in Inclusive Λ0 Production with a 200 GeV/c Polarized Proton Beam
A. Bravar et al. (Fermilab E704 Collaboration)
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A. Bravar17, D. L. Adams16, N. Akchurin7, N. I. Belikov6, B. E. Bonner16, J. Bystricky2, M. D. Corcoran16, J. D. Cossairt3, J. Cranshaw16, A. A. Derevschikov6, H. En'yo9, H. Funahashi9, Y. Goto9, O. A. Grachov6, D. P. Grosnick1, D. A. Hill1, T. Iijima9, K. Imai9, Y. Itow9, K. Iwatani5, K. Krueger4, K. Kuroda12, M. Laghai1, J. L. Langland7, F. Lehar2, A. de Lesquen2, D. Lopiano1, F. C. Luehring14, T. Maki8, S. Makino9, A. Masaike9, Yu. A. Matulenko6, A. P. Meschanin6, A. Michalowicz12, D. H. Miller14, K. Miyake9, T. Nagamine9, F. Nessi-Tedaldi16, M. Nessi16, C. Nguyen16, S. B. Nurushev6, Y. Ohashi1, Y. Onel7, D. I. Patalakha6, G. Pauletta18, A. Penzo17, G. F. Rappazzo13, A. L. Read3, J. B. Roberts16, L. van Rossum2, V. L. Rykov6, N. Saito9, G. Salvato13, P. Schiavon17, J. Skeens16, V. L. Solovyanov6, H. Spinka1, R. W. Stanek1, R. Takashima10, F. Takeutchi11, D. G. Underwood1, A. N. Vasiliev6, J. L. White16, S. Yamashita9, A. Yokosawa1, T. Yoshida15, and A. Zanetti17 (Fermilab E704 Collaboration)
1Argonne National Laboratory, Argonne, Illinois 60439
2Commissariat à l'Energie Atomique, DAPNIA/Service de Physique des Particules, Centre d'Etudes de Saclay, F-91191 Gif-sur-Yvette, France
3Fermi National Laboratory, Batavia, Illinois 60510
4Department of Physics, Fort Hays State University, Hays, Kansas 67601
5Hiroshima University, Higashi-Hiroshima 724, Japan
6Institute for High Energy Physics, 142284 Protvino, Russia
7Department of Physics, University of Iowa, Iowa City, Iowa 52242
8University of Occupation and Environmental Health, Kita-Kyushu 807, Japan
9Department of Physics, Kyoto University, Kyoto 603 Japan
10Kyoto University of Education, Kyoto 612, Japan
11Kyoto-Sangyo University, Kyoto 612, Japan
12Laboratoire de Physique des Particules, BP 909, 74017 Annecy-le-Vieux, France
13Dipartimento di Fisica, University of Messina, and Gruppo Collegato Istituto Nazionale di Fisica Nucleare Messina, I-98100 Messina, Italy
14Physics Department, Northwestern University, Evanston, Illinois 60201
15Osaka City University, Osaka 558, Japan
16T. W. Bonner Nuclear Laboratory, Rice University, Houston, Texas 77251
17Dipartimento di Fisica, University of Trieste, and Sezione Istituto Nazionale di Fisica Nucleare Trieste, I-34100 Trieste, Italy
18University of Udine, and Gruppo Collegato Istituto Nazionale di Fisica Nucleare Udine, I-33100 Udine, Italy
Received 5 December 1994; published in the issue dated 23 October 1995
The considerable polarization of hyperons produced at high xF has been known for a long time and has been interpreted with various theoretical models in terms of the constituents' spin. Recently, the analyzing power in inclusive Λ0 hyperon production has also been measured using the 200 GeV/c Fermilab polarized proton beam. The covered kinematic range is 0.2≤xF≤1.0 and 0.1≤pT≤1.5 GeV/c. The data indicate a negative asymmetry at large xF and moderate pT. These results can further test the current ideas on the underlying mechanisms for hyperon polarization.
© 1995 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.75.3073
DOI:
10.1103/PhysRevLett.75.3073
PACS:
13.88.+e, 13.85.Ni, 14.20.Jn
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