Tuesday, February 19, 2013

1302.3890 (Tomasz Golan et al.)

Axial Mass and Strangeness from MiniBooNE Neutral Current Elastic Cross
Section Measurement
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Tomasz Golan, Krzysztof M. Graczyk, Cezary Juszczak, Jan T. Sobczyk
Results of an analysis of the MiniBooNE (MB) experiment data for the neutral current elastic neutrino scattering on the $CH_{2}$ target with the NuWro Monte Carlo generator are presented. The main focus is on the investigation of the impact of a meson exchange current contribution (MEC) on the axial mass ($M_A$) estimation. It turns out that inclusion of the MEC leads to the value of $M_A$ which is consistent with the old estimations based on the neutrino-deuteron scattering data. Indeed, the model including the MEC contribution gives $M_A = 1003\pm 87$ MeV, while in the absence of MEC the value of $M_A^{eff} = 1312\pm 93$ MeV is obtained. The latter result is consistent with the original MB analysis. An estimation of the strange quark contribution to the nucleon spin was also attempted, but the data is not precise enough to get conclusive results.
View original: http://arxiv.org/abs/1302.3890

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