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Production of strange particles in antineutrino interactions at the CERN PS

Authors :
A. Marzari-Chiesa
S. Bonetti
M. Paty
A. Rognebakke
O. Erriquez
R. Sacco
B. Escoubes
G. R. Bonneaud
O. Skjeggestad
A. Halsteinslid
C. Franzinetti
J.L. Riester
M. Rollier
J.L. Guyonnet
V. Bisi
L. Riccati
C. Racca
A. Romero
Donatella Cavalli
Salvatore Nuzzo
M. Schaeffer
M.T. Fogli Muciaccia
D. Allasia
K. Myklebost
A. Pullia
D. Huss
D. Gamba
F. W. Bullock
T. W. Jones
A.G. Michette
C. Jarlskog
S. Natali
B. Tvedt
Heyd, Yvette
Institut de Recherches Subatomiques (IReS)
Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)
Source :
Nuclear Physics B, Nuclear Physics B, Elsevier, 1978, 140, pp.123-140
Publication Year :
1978
Publisher :
Elsevier BV, 1978.

Abstract

We have studied neutral strange particle production in the bubble chamber Gargamelle filled with propane and exposed to antineutrinos from the CERN PS. Cross sections are presented for Λ, Σ0 and K0 production. Associated production reactions (ΔS = 0) have been observed in the charged and the neutral current channels. From 45 candidates for the quasi-elastic reaction ν p → μ + Λ , on bound and free protons, estimates of the axial transition form factor MA have been made using the total cross section and the t distribution. The weighted average from the two methods is MA = 862 ± 190 MeV. From a subsample of 15 candidates for ν interactions on free protons in propane, with (28±6)% background from ν interactions on bound protons, we obtain MA = 883 ± 243 MeV. The polarization of the Λ hyperons has been studied for the quasi-elastic reaction. We observe a significant Λ polarization in the production plane, normal to the Λ line of flight. The observed polarizations agree well with the predicted theoretical polarizations without any contribution from second-class axial coupling.

Details

ISSN :
05503213
Volume :
140
Database :
OpenAIRE
Journal :
Nuclear Physics B
Accession number :
edsair.doi.dedup.....bfad1e9978859e914d9b48d76b580672
Full Text :
https://doi.org/10.1016/0550-3213(78)90316-4