Quasielastic production of polarized hyperons in antineutrino-nucleon reactions

Abstract

We have studied the differential cross section as well as the longitudinal and perpendicular components of polarization of final hyperon(Λ,Σ) produced in the antineutrino induced quasielastic charged current reactions on nucleon and nuclear targets. The nucleon-hyperon transition form factors are determined from the experimental data on quasielastic (∆S = 0) charged current (anti)neutrinonucleon scattering and the semileptonic decay of neutron and hyperons assuming G-invariance, T-invariance and SU(3) symmetry. The vector transition form factors are obtained in terms of nucleon electromagnetic form factors for which various parameterizations available in literature have been used. A dipole parameterization for the axial vector form factor and the pseudoscalar transition form factor derived in terms of axial vector form factor assuming PCAC and GT relation extended to strangeness sector have been used in numerical evaluations. The flux averaged cross section and polarization observables corresponding to CERN Gargamelle experiment have been calculated for quasielastic hyperon production and found to be in reasonable agreement with the experimental observations. The numerical results for the flux averaged differential cross section dσ dQ 2 and longitudinal(perpendicular) polarization PL(Q 2 )(PP (Q 2 )) relevant for the antineutrino fluxes of MINERνA, MicroBooNE, and T2K experiments have been presented. This will be useful in interpreting future experimental results on production cross sections and polarization observables from the experiments on the quasielastic production of hyperons induced by antineutrinos and explore the possibility of determining the axial vector and pseudoscalar form factors in the strangeness sector.

Weak quasielastic electroproduction of hyperons with polarization observables

“…To see the dependence of the polarization observables on E L e , we have integrated P L (Q 2 ) and P P (Q 2 ) over Q 2 and obtained P L (E L e ) and P P (E L e ) defined as [47] …”

“…Λ/Σ −→ N π, and the structure of the angular distribution of pions will give information about the polarization of hyperons. The polarization observables of the hyperons produced in the quasielastic reactions induced byν µ are shown to be more sensitive to the weak axial form factors [41][42][43][44][45][46][47].…”

Deep Underground Neutrino Experiment (DUNE) Near Detector Conceptual Design Report

“…One item of interest is Λ 0 production in antineutrino CCQE interactions, which can be studied in detail. The polarization components of the decay along and transverse to the Λ 0 momentum are sensitive to the axial form factor M A [282]. Though this has been looked at before [283], the high statistics available in the ND will make the measurement more interesting.…”

Spin asymmetry in single pion production induced by weak interactions of neutrinos with polarized nucleons

“…The investigation of the PT in the neutrino-nucleon and the neutrino-nucleus scattering has been discussed since the 1960s [34][35][36][37][38][39][40][41][42][43][44][45][46]. Recently in [33,47], we reported the results of the discussion of the impact of the NB contribution on the PT observables.…”