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



  history
ID: 282143.0, MPI für Kernphysik / Heavy Flavour Physics
A measurement of λ polarization in inclusive production by ∑- of 340 GeV/c in C and Cu targets
Authors:Adamovich, M. I.; Alexandrov, Y. A.; Baranov, S. P.; Barberis, D.; Beck, M.; Berat, C.; Beusch, W.; Boss, M.; Brons, S.; Bruckner, W.; Buenerd, M.; Busch, C.; Buscher, C.; Charignon, F.; Chauvin, J.; Chudakovc, E. A.; Dersch, U.; Dropmann, F.; Engelfried, J.; Faller, F.; Fournier, A.; Gerassimov, S. G.; Godbersen, M.; Grafstrom, P.; Haller, T.; Heidrich, M.; Hubbard, E.; Hurst, R. B.; Konigsmann, K.; Konorov, I.; Keller, N.; Martens, K.; Martin, P.; Masciocchi, S.; Michaels, R.; Muller, U.; Neeb, H.; Newbold, D.; Newsom, C.; Paul, S.; Pochodzalla, J.; Potashnikova, I.; Povh, B.; Ransome, R.; Ren, Z.; Rey-Campagnolle, M.; Rosner, G.; Rossi, L.; Rudolph, H.; Scheel, C.; Schmitt, L.; Siebert, H. W.; Simon, A.; Smith, V.; Thilmann, O.; Trombini, A.; Vesin, E.; Volkemer, B.; Vorwalter, K.; Walcher, T.; Walder, G.; Werding, R.; Wittmann, E.; Zavertyaev, M. V.
Language:English
Date of Publication (YYYY-MM-DD):2004-04
Title of Journal:The European Physical Journal C
Journal Abbrev.:Eur. Phys. J. C
Volume:32
Issue / Number:2
Start Page:221
End Page:228
Copyright:© Springer. Part of Springer Science+Business Media
Review Status:Peer-review
Audience:Experts Only
Intended Educational Use:No
Abstract / Description:We have measured the polarization of $\Lambda$ hyperons produced inclusively by a $\Sigma^-$ beam of 340 GeV/c momentum in nuclear targets. From a sample of 9.5 millions of identified $\Lambda$ decays, polarizations were determined in the range x F > 0.1 and $p_t\leq 1.6$ GeV/c . The polarization w.r.t. the production normal is mainly positive for $x_F \geq $ 0.3. At fixed values of x F , it increases with p t to a maximum between p t = 0.5 and p t = 1 GeV/c , and then decreases to zero or even negative values, in sharp contrast to the plateau above p t = 1 GeV/c observed in inclusive $\Lambda$ production by protons.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Guest Groups and Emeriti/Particle and Nuclear Physics (B. Povh)
External Affiliations:PN Lebedev Phys Inst, Leninsky Prospect 53, Moscow 117924,; Russia; PN Lebedev Phys Inst, Moscow 117924, Russia; Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany; Univ Heidelberg, Inst Phys, D-69120 Heidelberg, Germany; Univ Grenoble 1, Inst Sci Nucl, F-38026 St Martin Dheres, France; Univ Genoa, Ist Nazl Fis Nucl, Dipartimento Fis, I-16146 Genoa, Italy; CERN, CH-1211 Geneva 23, Switzerland; Univ Bristol, Bristol BS8 1TH, Avon, England
Identifiers:DOI:10.1140/epjc/s2003-01357-3
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