Vg. Zaetz et al., SPIN ALIGNMENT AND PARITY VIOLATION EFFECTS IN RHO(0) PRODUCTION IN NEUTRINO AND ANTINEUTRINO CHARGED-CURRENT INTERACTIONS, Zeitschrift fur Physik. C, Particles and fields, 66(4), 1995, pp. 583-590
Most of the measured events on hydrogen, deuterium and neon targets fr
om BEBC at CERN and the 15-foot Bubble Chamber at Fermilab are combine
d to measure spin-density matrix elements for rho(0) production in the
current-fragmentation region in neutrino and antineutrino charged-cur
rent interactions. The spin-alignment parameter eta is found to be 0.0
8 +/- 0.11 for neutrino and 0.41 +/- O.11 for antineutrino interaction
s. The parity-odd density matrix element Im(rho(10) + rho(-10)) is con
sistent with zero in both reactions. In the combined neutrino and anti
neutrino data an indication of parity violation is observed: Im rho(1-
1) = 0.38 +/- 0.16 at x(B) > 0.2, Q(2) > 8 GeV2 and z > 0.6.