88 research outputs found

    Constraining the GENIE model of neutrino-induced single pion production using reanalyzed bubble chamber data

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    The longstanding discrepancy between bubble chamber measurements of νμ\nu_\mu-induced single pion production channels has led to large uncertainties in pion production cross section parameters for many years. We extend the reanalysis of pion production data in deuterium bubble chambers where this discrepancy is solved (Wilkinson et al., PRD 90 (2014) 112017) to include the νμnμpπ0\nu_{\mu}n\rightarrow \mu^{-}p\pi^{0} and νμnμnπ+\nu_{\mu}n\rightarrow \mu^{-}n\pi^{+} channels, and use the resulting data to fit the parameters of the GENIE (Rein-Sehgal) pion production model. We find a set of parameters that can describe the bubble chamber data better than the GENIE default parameters, and provide updated central values and reduced uncertainties for use in neutrino oscillation and cross section analyses which use the GENIE model. We find that GENIE's non-resonant background prediction has to be significantly reduced to fit the data, which may help to explain the recent discrepancies between simulation and data observed by the MINERvA coherent pion and NOvA oscillation analyses.Comment: v3: Updated to match published versio

    Using MiniBooNE neutral current elastic cross section results to constrain 3+1 sterile neutrino models

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    The MiniBooNE Neutral Current Elastic (NCEL) cross section results are used to extract limits in the Δm2sin2ϑμs\Delta m^{2}-\sin^{2}\vartheta_{\mu s} plane for a 3+1 sterile neutrino model with a mass splitting 0.1Δm210.00.1 \leq \Delta m^{2} \leq 10.0 eV2^{2}. GENIE is used with a cross section model close to the one employed by MiniBooNE to make event rate predictions using simulations on the MiniBooNE target material CH2_{2}. The axial mass is a free parameter in all fits. Sterile modifications to the flux and changes to the cross section in the simulation relate the two and allow limits to be set on sterile neutrino mixing using cross section results. The large axial mass problem makes it necessary for experiments to perform their own axial mass fits, but a prior fit to the same dataset could mask a sterile oscillation signal if the sterile and cross section model parameters are not independent. We find that for the NCEL dataset there are significant correlations between the sterile and cross section model parameters, making a fit to both models simultaneously necessary to get robust results. Failure to do this results in stronger than warranted limits on the sterile parameters. The general problems that the current uncertainty on charged-current quasi-elastic (CCQE) and NCEL cross sections at MiniBooNE energies pose for sterile neutrino measurements are discussed.Comment: Final version accepted for publication in JHE

    A tolerable candle: the low-ν\nu method with LHC neutrinos

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    The Forward Physics Facility (FPF) plans to use neutrinos produced at the Large Hadron Collider (LHC) to make a variety of measurements at previously unexplored TeV energies. Its primary goals include precision measurements of the neutrino cross section and using the measured neutrino flux both to uncover information about far-forward hadron production and to search for various beyond standard model scenarios. However, these goals have the potential to conflict: extracting information about the flux or cross section relies upon an assumption about the other. In this manuscript, we demonstrate that the FPF can use the low-ν\nu method -- a technique for constraining the flux shape by isolating neutrino interactions with low energy transfer to the nucleus -- to break this degeneracy. We show that the low-ν\nu method is effective for extracting the νμ\nu_{\mu} flux shape, in a model-independent way. We discuss its application for extracting the νˉμ\bar{\nu}_{\mu} flux shape, but find that this is significantly more model dependent. Finally, we explore the precision to which the νμ\nu_{\mu} flux shape could be constrained at the FPF, for a variety of proposed detector options. We find that the precision would be sufficient to discriminate between various realistic flux models
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