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We report a new measurement of the neutron antineutrino spin asymmetry coefficient B in the beta decay of polarized neutrons. Combining results of measurements of the observed asymmetry PB = 0.6617~0.0044 with measurements of the neutron beam polarization P = (66.88~0.22)% we obtain the value B = 0.9894~0.0083. This value implies that the mass of a hypothetical righthanded charged gauge boson in the left-right symmetric model of the weak interaction is greater than 281 GeV/c2 (90% C. L.). This is in agreement with restrictions from muon decay and direct searches

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