Measurement of the polarization of the Ξ 0 (over(Ξ 0, -)) hyperon beam by the NA48/1 experiment

J. R. Batley, G. E. Kalmus, C. Lazzeroni, D. J. Munday, M. Patel, M. W. Slater, S. A. Wotton, R. Arcidiacono, G. Bocquet, A. Ceccucci, D. Cundy, N. Doble, V. Falaleev, L. Gatignon, A. Gonidec, P. Grafström, W. Kubischta, I. Mikulec, A. Norton, B. Panzer-SteindelP. Rubin, H. Wahl, E. Goudzovski, P. Hristov, V. Kekelidze, L. Litov, D. Madigozhin, N. Molokanova, Yu Potrebenikov, S. Stoynev, A. Zinchenko, E. Monnier, E. Swallow, R. Winston, R. Sacco, A. Walker, W. Baldini, A. Gianoli, P. Dalpiaz, P. L. Frabetti, M. Martini, F. Petrucci, M. Savrié, M. Scarpa, M. Calvetti, G. Collazuol, E. Iacopini, G. Ruggiero, A. Bizzeti, M. Lenti, M. Veltri, M. Behler, K. Eppard, M. Eppard, A. Hirstius, K. Kleinknecht, U. Koch, P. Marouelli, L. Masetti, U. Moosbrugger, C. Morales Morales, A. Peters, R. Wanke, A. Winhart, A. Dabrowski, T. Fonseca Martin, M. Velasco, P. Cenci, P. Lubrano, M. Pepe, G. Anzivino, E. Imbergamo*, G. Lamanna, A. Michetti, A. Nappi, M. C. Petrucci, M. Piccini, M. Valdata, C. Cerri, R. Fantechi, F. Costantini, L. Fiorini, S. Giudici, G. Pierazzini, M. Sozzi, I. Mannelli, C. Cheshkov, J. B. Cheze, M. De Beer, P. Debu, G. Gouge, G. Marel, E. Mazzucato, B. Peyaud, B. Vallage, M. Holder, A. Maier, M. Ziolkowski, C. Biino, N. Cartiglia, F. Marchetto, N. Pastrone, M. Clemencic, S. Goy Lopez, E. Menichetti, W. Wislicki, H. Dibon, M. Jeitler, M. Markytan, G. Neuhofer, L. Widhalm

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A total of 368 415 Ξ 0 → Λ π 0 and 31 171 over(Ξ 0, -) → over(Λ, -) π 0 were selected from data recorded in the NA48/1 experiment during 2002 data taking. From this sample, the polarization of Ξ 0 and over(Ξ 0, -) hyperons was measured to be P Ξ0 = - 0.102 ± 0.012 (stat) ± 0.008 (syst) and P over(Ξ0, -) = - 0.01 ± 0.04 (stat) ± 0.008 (syst). The dependence of P Ξ0 on the Ξ 0 transverse momentum with respect to the primary proton beam is also presented. With the same data sample, the ratio of over(Ξ 0, -) and Ξ 0 fluxes in proton collisions at 400 GeV / c on a beryllium target was measured.

Original languageEnglish (US)
Pages (from-to)406-412
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume681
Issue number5
DOIs
StatePublished - Nov 16 2009

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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