Investigation of recent weak single-pion production data

MiniBooNE [A. A. Aguilar-Arevalo et al. (MiniBooNE Collaboration), Phys. Rev. D 83, 052007 (2011)] and MINERvA (B. Eberly et al., arXiv:1406.6415v2 [hep-ex]) charge current ${\pi }^{+}$ production data in the $\Delta$ region are discussed. It is argued that despite the differences in neutrino flux, they measure the same dynamical mechanism of pion production and should be strongly correlated. The correlation is clearly seen in the Monte Carlo simulations done with the NuWro generator but is missing in the data. Both the normalization and the shape of the ratio of measured differential cross sections in pion kinetic energy are different from the Monte Carlo results; in the case of normalization the discrepancy is by a factor of $1.49$.

Figure 1

Differential cross section in pion kinetic energy. MiniBooNE data points are taken from Ref. [13]; MINERvA, from Ref. [14].

Figure 2

MiniBooNE differential cross section in pion kinetic energy taken from Ref. [13], rebinned into MINERvA-sized bins.

Figure 3

Differential cross section in pion kinetic energy. MiniBooNE and MINERvA data points are shown together with NuWro predictions.

Figure 4

Contributions from the RES channel to MiniBooNE and MINERvA differential cross sections in pion kinetic energy as predicted by NuWro.

Figure 5

Spectrum of the pion kinetic energy for MiniBooNE and MINERvA as predicted by NuWro without FSI effects. The last bin combines pions with kinetic energies above 1 GeV.

Figure 6

Ratios of differential cross sections in pion kinetic energy from MINERvA and MiniBooNE experiments together with NuWro predictions.

Figure 7

The same as Fig. 6, but with experimental results rescaled by a factor of $\eta =1.49$.