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  • Open Access

First measurement of the charged current ν¯μ double differential cross section on a water target without pions in the final state

K. Abe et al. (The T2K Collaboration)
Phys. Rev. D 102, 012007 – Published 21 July 2020
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Abstract
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  • INTRODUCTION
  • T2K EXPERIMENT
  • DATA AND MONTE CARLO SAMPLES
  • EVENT AND KINEMATIC SELECTION
  • DOUBLE-DIFFERENTIAL CROSS SECTION…
  • DATA RESULTS AND COMPARISON TO MODELS
  • DISCUSSION AND SUMMARY
  • ACKNOWLEDGMENTS
    • References

    Abstract

    This paper reports the first differential measurement of the charged-current ν¯μ interaction cross section on water with no pions in the final state. The unfolded flux-averaged measurement using the T2K off-axis near detector is given in double-differential bins of μ+ momentum and angle. The integrated cross section in a restricted phase space is σ=(1.11±0.18)×10−38  cm2 per water molecule. Comparisons with several nuclear models are also presented.

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    • Received 28 August 2019
    • Accepted 24 June 2020

    DOI:https://doi.org/10.1103/PhysRevD.102.012007

    Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

    Published by the American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Nucleus-neutrino interactionsParticle interactionsParticle mixing & oscillations
    Particles & FieldsNuclear Physics

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    Vol. 102, Iss. 1 — 1 July 2020

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    Images

    • Figure 1
      Figure 1

      The RHC flux given per cm2/50  MeV/1021 PoT as a function of energy at the ND280 detector for the different neutrino components (ν¯μ, νμ, ν¯e, νe).

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    • Figure 2
      Figure 2

      Side view schematic diagram of the P∅D detector. The white, zigzag, and blue regions represent the vertical scintillator bars, horizontal scintillator bars, and water bag regions, respectively. The vertical and horizontal bars represent an x−y module or P∅Dule. The first and last groups of seven P∅Dules form the upstream and central ECAL “super” modules, and the middle 26 P∅Dules interleaved with the water bags are the water target region. In this drawing, the beam direction (+z) is to the right, the +y direction is up, and the +x direction is into the figure.

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    • Figure 3
      Figure 3

      Comparisons of lab-frame momentum (left column) and cosθ (right column) distributions between data (black dots with error bars) and NEUT simulation predictions before fitting (stacked color bands). The CC-0π selections have been applied on the water-in samples [(a) and (b)] and water-out samples [(c) and (d)]. The CC-1π selections have been applied on the water-in samples [(e) and (f)] and water-out samples [(g) and (h)].

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    • Figure 4
      Figure 4

      The CC-0π selection efficiency plots in 2D p vs cosθ bins for water-in (a), water-out (b), and water target only (c). There are 28 bins whose edges are drawn with vertical and horizontal lines. The efficiencies are given in color bands and it is noted that the efficiencies are very similar. The last plot (d) is the bin index given in Table 4. Note that the twenty-eighth bin in Table 3 is outside the plot boundary. The fit results in Sec. 6a use these 19 bins, which are a subset of the 28 bins.

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    • Figure 5
      Figure 5

      Covariance matrix of water-in coefficients before (a) and after (b) regularization was applied to a test MC sample. The regularization reduces off-diagonal correlations.

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    • Figure 6
      Figure 6

      Fit results of CC-0π events rates in 19 cross section bins for unregularized (a) and regularized (b) results for water events.

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    • Figure 7
      Figure 7

      Regularization L-curve of data for regularized results. Figure 6 is obtained when preg=1.

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    • Figure 8
      Figure 8

      Post-fit results of water (a) and non-water (b) events which correspond to the 28 scale parameters cj and dj, respectively.

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    • Figure 9
      Figure 9

      Covariance matrix of water parameters for unregularized fits (a) and regularized fits (b).

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    • Figure 10
      Figure 10

      Regularized fit results of data as a function of 19 cosθ bins in seven different momentum ranges with comparisons to NEUT (v5.41), GENIE (v2.12.10), and NuWro (v18.02.1) predictions. The fit χ2 of each model is defined by Eq. (13).

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    • Figure 11
      Figure 11

      Unregularized fit results on data as a function of 19 cosθ bins in seven different momentum ranges with comparisons to NEUT (v5.41), GENIE (v2.12.10), and NuWro (v18.02.1) predictions. The fit χ2 of each model is defined by Eq. (13).

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