Measurement of the charged-current electron (anti-)neutrino inclusive cross-sections at the T2K off-axis near detector N
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Springer
Received: February Revised: July Accepted: September Published: October
28, 20, 13, 19,
2020 2020 2020 2020
The T2K collaboration E-mail: [email protected] Abstract: The electron (anti-)neutrino component of the T2K neutrino beam constitutes the largest background in the measurement of electron (anti-)neutrino appearance at the far detector. The electron neutrino scattering is measured directly with the T2K offaxis near detector, ND280. The selection of the electron (anti-)neutrino events in the plastic scintillator target from both neutrino and anti-neutrino mode beams is discussed in this paper. The flux integrated single differential charged-current inclusive electron (anti-)neutrino cross-sections, dσ/dp and dσ/d cos(θ), and the total cross-sections in a limited phase-space in momentum and scattering angle (p > 300 MeV/c and θ ≤ 45◦ ) are measured using a binned maximum likelihood fit and compared to the neutrino Monte Carlo generator predictions, resulting in good agreement. Keywords: Other experiments ArXiv ePrint: 2002.11986
c The Authors. Open Access, Article funded by SCOAP3 .
https://doi.org/10.1007/JHEP10(2020)114
JHEP10(2020)114
Measurement of the charged-current electron (anti-)neutrino inclusive cross-sections at the T2K off-axis near detector ND280
Contents 1
2 Experimental setup 2.1 T2K beam 2.2 T2K off-axis near detector ND280
3 3 3
3 Data samples and MC simulation
6
4 Selection of electron (anti-)neutrino interactions at ND280 4.1 Signal and background definitions 4.2 Event selection 4.3 Final selection 4.4 Event selection using alternative MC
7 8 8 11 13
5 Photon background control samples 5.1 Selection of photon candidates 5.2 Comparisons with the photon background in the standard selections
15 15 19
6 Systematic uncertainties 6.1 Effect of systematic uncertainties on the event yields 6.2 Effect of systematic uncertainties on the photon control samples
19 22 23
7 Fit model 7.1 Propagation of systematic uncertainties 7.2 Binning choice
23 25 26
8 Cross-section results 8.1 Total cross-sections in limited phase-space 8.2 Comparisons to additional models
27 30 30
9 Summary and conclusions
33
The T2K collaboration
39
1
Introduction
The measurement of the νµ → νe (and ν¯µ → ν¯e ) oscillations — which is the main goal of the T2K experiment [1] — is affected by two main background sources. The first is the intrinsic νe and ν¯e beam contaminations and the second is the neutral current (NC) π 0 production, where the π 0 can mimic an electron from a charged-current (CC) νe or ν¯e
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JHEP10(2020)114
1 Introduction
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JHEP10(2020)114
interaction at the far detector, Super-Kamiokande. In addition, the νµ → νe (¯ νµ → ν¯e ) appearance signal is predicted by using a predominantly νµ (¯ νµ ) sample, which relies on the knowledge of the νe (¯ νe ) cross-section relative to the νµ (¯ νµ ). The modelling of signal and backgrounds is strongly depending on the neutrino cross-sections and the near detector is crucial for measuring them. The electron (anti-)
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