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Polarization transfer in weak pion production off the nucleon

Krzysztof M. Graczyk and Beata E. Kowal
Phys. Rev. D 97, 013001 – Published 8 January 2018

Abstract

Polarization transfer (PT) observables in the single pion production induced by the charged current interaction of the neutrino with the nucleon are examined. The polarization components of the final nucleon and the charged lepton are calculated within two models for the pion production. The predictions are made for neutrino energy of the order of 1 GeV as well as for the T2K energy distribution. It is demonstrated that the PT observables, the degree of polarization and the polarization components of outgoing fermions, are sensitive to assumptions about the nonresonant background model. In particular it is shown that the normal components of the polarization of the outgoing nucleon and the lepton are determined by the interference between the resonant (RES) and nonresonant (NB) amplitudes. Moreover, the sign of the normal component of the polarization of the charged lepton is fixed by the relative sign between the RES and the NB amplitudes.

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  • Received 15 November 2017

DOI:https://doi.org/10.1103/PhysRevD.97.013001

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)

Particles & Fields

Authors & Affiliations

Krzysztof M. Graczyk* and Beata E. Kowal

  • Institute of Theoretical Physics, University of Wrocław, plac Maxa Borna 9, 50-204 Wrocław, Poland

  • *krzysztof.graczyk@uwr.edu.pl

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Vol. 97, Iss. 1 — 1 January 2018

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