Speaker
Description
Understanding the polarization of final-state leptons in neutrino–nucleus interactions is essential for studies of fundamental symmetries and precision measurements. We present an implementation of final-state lepton polarization in the GENIE neutrino event generator, with emphasis on charged-current quasielastic (CCQE) and two-particle–two-hole (2p2h) processes.
The polarization vector of the outgoing lepton is computed using a covariant formalism based on the polarization density matrix constructed from leptonic and nuclear tensors. The resulting polarization information is incorporated into the GENIE event record, allowing for detailed studies of spin-dependent effects in event reconstruction and detector simulations.
The implementation has been validated for all CCQE and 2p2h models currently available in GENIE. This development enables systematic investigations of polarization-sensitive observables, such as lepton angular asymmetries and signatures of possible non-standard interactions. It improves the realism of GENIE simulations and provides a framework for more complete modeling of polarization effects in neutrino experiments, including DUNE and Hyper-Kamiokande.
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