Publicación:
Tuning the GENIE pion production model with MINERvA data
Tuning the GENIE pion production model with MINERvA data
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Fecha
2019
Autores
Stowell, P
Pickering, L
Willcinson, C
Wret, C
Akbar, F
Andrade, DA
Ascencio, MV
Bellantoni, L
Bercellie, A
Betancourt, M
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American Physical Society
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Abstracto
Faced with unresolved tensions between neutrino interaction measurements at few-GeV neutrino energies, current experiments are forced to accept large systematic uncertainties to cover discrepancies between their data and model predictions. The widely used pion production model in genie is compared to four MINER𝜈A charged current pion production measurements using nuisance. Tunings, i.e., adjustments of model parameters, to help match genie to MINER𝜈A and older bubble chamber data are presented. We find that scattering off nuclear targets as measured in MINER𝜈A is not in good agreement with expectations based upon scattering off nucleon (hydrogen or deuterium) targets in existing bubble chamber data. An additional ad hoc correction for the low−𝑄2 region, where collective nuclear effects are expected to be large, is presented. While these tunings and corrections improve the agreement of genie with the data, the modeling is imperfect. The development of these tunings within the nuisance framework allows for straightforward extensions to other neutrino event generators and models, and allows omitting and including new datasets as they become available.
Descripción
CONCYTEC, Direccion de Gestion de la Investigacion-Pontificia Universidad Catolica del Peru (DGI-PUCP), and Vicerrectorado de Investigacion-Universidad Nacional de Ingenieria (VRI-UNI) (Peru); and by the Latin American Center for Physics (CLAF); NCN Opus Grant No. 2016/21/B/ST2/01092 (Poland). We thank the MINOS Collaboration for use of its near detector data. Finally, we thank the staff of Fermilab for support of the beam line, the detector, and the computing infrastructure.
Palabras clave
Neutrino interactions,
Few-GeV energies,
Systematic uncertainties