Research Result Report
ICRR Inter-University Research Program 2022
Research Subject:
Constraining systematics at T2K and SuperKamiokande oscillation analyses
using neutrino-nucleus interaction models
Principal Investigator:
Guillermo D. Megias (University of Seville)
Participating Researchers:

Juan Antonio Caballero Carretero (University of Seville)Juan Manuel Franco Patiño (University of Seville)

Jesús González Rosa (University of Seville)

Raúl González Jiménez (Complutense University of Madrid)José Manuel Udías Moinelo (Complutense University of Madrid)Maria Benedetta Barbaro (University of Turin and INFN)

T. William Donnelly (Massachusetts Institute of Technology (MIT))Kimihiro Okumura (University of Tokyo, ICRR)Yoshinari Hayato (University of Tokyo, ICRR)

Summary of Research Result：
Progresses on the development and optimization of neutrino interaction
models (SuSAv2-MEC and RMF models) for the analysis of data from T2K andother experiments have been published in FY2022 together with other T2K
papers in common with ICRR members:- J. Gonzalez-Rosa, G. D. Megias, J. A. Caballero, M. B. Barbaro. SuSAv2 model
for inelastic neutrino-nucleus scattering. Phys. Rev. D 105, 093009 (2022).
- J.M. Franco-Patino et al.. Final state interactions in semi-inclusive neutrinonucleus scattering: Applications to the T2K and MINER$\nu$A experiments.
Phys. Rev. D 106, 113005 (2022).
- J. M. Franco-Patino, et al.. Study of semi-inclusive CC electron and muon
neutrino scattering from 40Ar in the energy range of the MicroBooNE
experiment. arXiv:2304.01916 [hep-ex] (2023). Submitted to PRD.
- K. Abe et al. (T2K Collaboration), Scintillator ageing of the T2K neardetectors from 2010 to 2021. Journal of Instrumentation, 17, P10028 (2022).
- K. Abe et al. (T2K Collaboration), First measurement of \mu_\nu CCinteractions on hydrocarbon without pions in the FS using multiple detectors
with correlated energy spectra at T2K. arXiv:2303.14228 [hep-ex] (2023).
- K. Abe et al. (T2K Collaboration), Measurements of neutrino oscillation

parameters from the T2K experiment using 3.6×1021 protons on target.
arXiv:2303.03222 [hep-ex] (2023).
Work is in progress with Prof. Hayato-san (ICRR) to include the DCC modelfrom the Osaka group in the SuSAv2 model and subsequently implement it in
the NEUT event generator used in T2K and SuperKamiokande. This will allow
to use different approaches to analyze the resonant regime in neutrinonucleus reactions. Also, in collaboration with Hayato-san and other T2K
members, a first implementation of the inclusive and semi-inclusive SuSAv2
and RMF-1p1h models in NEUT is also in progress. This will allow thereweight of several parameters for the oscillation analysis, the study of
nuclear-medium

effects,

anda

comparison

between

nuclear

opticalpotentials and cascade models in generators, among other issues. The
outcomes of this research are expected to be published in coming months,
and have been also presented at several conferences and meetings:- T2K Collaboration Meeting (Tokai, Japan): - Study of inelastic neutrinonucleus scattering using the SuSAv2 model, J. Gonzalez-Rosa. - Modelling ofsemi-inclusive nu-A scattering, J. M. Franco-Patino. - Summary of NIWG
theory talks, G. D. Megias. February 2023
- XXXVIII Biennial of Physics (Valencia, Spanish Royal Physics Society RSEF).
“Therelevanceofneutrino-nucleus

interactionmodels

inneutrinooscillations”. G. D. Megias. July 2022
- 23rd International Workshop on Neutrinos from Accelerators (NUFACT2022).
"Final state interactions in semi-inclusive nu-A scattering: application to T2K
and MINERvA experiments". J. M. Franco-Patino. August 2022
- CERN EP-NU Meeting (Switzerland). "Modelling neutrino-nucleus interactions
for long-baseline neutrino oscillation experiments”. G. D. Megias. Nov 2022
- 43rd International school of nuclear physics (Erice, Italy). "Modelling semiinclusive neutrino-nucleus interactions". J. M. Franco-Patino. September 2022
With regard to the ICRR Research Program, the Univ. of Seville group has
obtained a 3-year R&D project of the Spanish Ministry of Science in which
Prof. Hayato-san (ICRR) participates as collaborator. The Univ. of Sevilleconsider these projects a research line of strategic interest, having approveda special allocation to support the participation of their researchers in T2K.
We will also continue these projects on FY2023 under the ICRR InterUniversity Research Program 2023.
No. J001