We present a measurement of the polarization of Antilambda hyperons produced in nu_mu charged current interactions. The full data sample from the NOMAD experiment has been analyzed using the same V0 identification procedure and analysis method reported in a previous paper for the case of Lambda hyperons. The Antilambda polarization has been measured for the first time in a neutrino experiment. The polarization vector is found to be compatible with zero.
Lambdabar polarization in regions of Feynman X (XL).
Lambdabar polarization in regions of the Bjorken scaling variable X.
Using data onvp and\(\bar vp\) charged current interactions from a bubble chamber experiment with BEBC at CERN, the average multiplicities of charged hadrons and pions are determined as functions ofW2 andQ2. The analysis is based on ∼20000 events with incidentv and ∼10000 events with incident\(\bar v\). In addition to the known dependence of the average multiplicity onW2 a weak dependence onQ2 for fixed intervals ofW is observed. ForW>2 GeV andQ2>0.1 GeV2 the average multiplicity of charged hadrons is well described by〈n〉=a1+a2ln(W2/GeV2)+a3ln(Q2/GeV2) witha1=0.465±0.053,a2=1.211±0.021,a3=0.103±0.014 for thevp anda1=−0.372±0.073,a2=1.245±0.028,a3=0.093±0.015 for the\(\bar vp\) reaction.
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We present a study of antineutrino interactions in hydrogen obtained in a 138000-picture run at the BNL 7-ft bubble chamber. The antineutrino beam had an energy distribution that peaked at ∼1.1 GeV. The cross section measured for charged-current interactions is σ(ν¯p→μ++anything)=(0.32±0.08)×10−38×[Eν¯ (GeV)] cm2. The neutral-current cross section is σ(ν¯p→ν¯pπ+π−)=5.5−2.6+4.4×10−40 cm2. The ratio of strangeness-changing to non-strangeness-changing charged currents is Rs=0.06−0.05+0.13. An upper limit determined for charm production is σc<3.8×10−40 cm2 at the 90% confidence level. From the momentum-transfer distribution we measure average Q2 for inelastic charged-current events with energy greater than 2 GeV, 〈Q2〉=(0.10±0.03)[Eν¯ (GeV)]+(0.10±0.09) (GeV/c)2. Using a maximum-likelihood method we determine from the quasielastic events ν¯p→μ+n an axial-vector mass MA=0.9−0.3+0.4 GeV/c2.
Measured charged current total cross section.