Measurement of the Λ hyperon polarization in νμ charged current interactions in the NOMAD experiment
2001
The Λ polarization in νμ
charged currentinteractions has been measured in the NOMAD experiment. The event sample (8087 reconstructed Λ 's) is more than an order of magnitude larger than that of previous
bubble chamberexperiments, while the quality of
event reconstructionis comparable. We observe negative polarization along the W -boson direction which is enhanced in the target fragmentation region: Px(xF 0)=−0.09±0.06(
stat)±0.03(sys) . These results provide a test of different models describing the nucleon spin composition and the spin transfer mechanisms. A significant transverse polarization (in the direction orthogonal to the Λ production plane) has been observed for the first time in a neutrino experiment: Py=−0.22±0.03(
stat)±0.01(sys) . The dependence of the absolute value of Py on the Λ transverse momentum with respect to the
hadronicjet direction is in qualitative agreement with the results from unpolarized
hadron–hadronexperiments.
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