Spin alignment and parity violation effects inρ0 production in neutrino and antineutrino charged-current interactions

Authors :: Zaetz, V. G.
Aderholz, M.
Ammosov, V. V.
Asratyan, A. E.
Coghen, T.
Erriquez, O.
Gapienko, V. A.
Gapienko, G. S.
Guy, J.
Jones, G. T.
Kaftanov, V. S.
Katz, U. F.
Korotkov, V. A.
Krutchinin, S. P.
Kubantsev, M. A.
Marage, P.
Morrison, D. R. O.
Schmitz, N.
Varvell, K. E.
Venus, W.
Wittek, W.
Source :: Zeitschrift für Physik C Particles and Fields; December 1995, Vol. 66 Issue: 4 p583-590, 8p
Publication Year :: 1995
Abstract: 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 ρ<superscript>0</superscript> 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(ρ<subscript>10</subscript>+ρ<subscript>−10</subscript>) is consistent with zero in both reactions. In the combined neutrino and antineutrino data an indication of parity violation is observed: Im ρ<subscript>1−1</subscript>=0.38±0.16 atx<subscript>B</subscript>>0.2,Q<superscript>2</superscript>>8 GeV<superscript>2</superscript> andz>0.6.

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