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Spin alignment and parity violation effects in ρ0 production in neutrino and antineutrino charged-current interactions

par Zaetz, V.G.;Ammosov, VV;Gapienko, V.A. V.A.;Gapienko, Galina G.S.;Korotkov, V.A.;Aderholz, M;Katz, Uli U.F.;Schmitz, Norbert;Wittek, Wolfgang;Asratyan, A.E.;Kaftanov, V.S. V.S.;Krutchinin, S.P. S.P.;Kubantsev, M.A. M.A.;Coghen, T.;Erriquez, Onofrio;Guy, J. G V;Venus, W.;Jones, G.T.;Varvell, Kevin K.E.;Marage, Pierre ;Morrison, Douglas R O
Référence Zeitschrift für Physik. C, Particles and fields, 66, 4, page (583-590)
Publication Publié, 1995-12

Article révisé par les pairs

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Résumé :

Most of the measured events on hydrogen, deuterium and neon targets from BEBC at CERN and the 15-foot Bubble Chamber at Fermilab are combined to measure spin-density matrix elements for ρ0 production in the current-fragmentation region in neutrino and antineutrino charged-current interactions. The spin-alignment parameter η is found to be 0.08±0.11 for neutrino and 0.41±0.11 for antineutrino interactions. The parity-odd density matrix element Im(ρ10+ρ-10) is consistent with zero in both reactions. In the combined neutrino and antineutrino data an indication of parity violation is observed: Im ρ1-1=0.38±0.16 at xB>0.2, Q2>8 GeV2 and z>0.6. © 1995 Springer-Verlag.