Theoretical study of lepton events in the atmospheric neutrino experiments at SuperK

Abstract

Super-Kamiokande has reported the results for the lepton events in the atmospheric neutrino experiment. These results have been presented for a 22.5kT water fiducial mass on an exposure of 1489 days, and the events are divided into sub-GeV, multi-GeV and PC events. We present a study of nuclear medium effects in the sub-GeV energy region of atmospheric neutrino events for the quasielastic scattering, incoherent and coherent pion production processes, as they give the most dominant contribution to the lepton events in this energy region. We have used the atmospheric neutrino flux given by Honda et al. These calculations have been done in the local density approximation. We take into account the effect of Pauli blocking, Fermi motion, Coulomb effect, renormalization of weak transition strengths in the nuclear medium in the case of the quasielastic reactions. The inelastic reactions leading to production of leptons along with pions is calculated in a $\Delta$- dominance model by taking into account the renormalization of $\Delta$ properties in the nuclear medium and the final state interaction effects of the outgoing pions with the residual nucleus. We present the results for the lepton events obtained in our model with and without nuclear medium effects, and compare them with the Monte Carlo predictions used in the simulation and the experimentally observed events reported by the Super-Kamiokande collaboration.

23 pages, 13 figures

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• From eV to EeV: Neutrino Cross Sections Across Energy Scales
• Inclusive Charged--Current Neutrino--Nucleus Reactions
• Progress and open questions in the physics of neutrino cross sections
• Charged Pion Production in ${\nu }_{\mu }$ Interactions on Hydrocarbon at $⟨E_{\nu }⟩$= 4.0 GeV
• Neutrino-nucleus interactions and the determination of oscillation parameters
• Weak charged and neutral current induced one pion production off the nucleon
• Electroweak Form Factors of the $\Delta$(1232) Resonance
• Electron and Muon production cross sections in quasielastic $\nu (\bar{\nu })$-Nucleus scattering for $E_{\nu }<1GeV$
• On Impact of Nuclear Effects on Weak Pion Production in Sub 1 GeV Energy Region
• ${\bar{\nu }}_l$ induced pion production from nuclei at $\sim$1 GeV
• Neutrino-nucleus cross sections in ${}^{12}C$ and ${}^{40}Ar$ with KDAR neutrinos
• ${\bar{\nu }}_{\mu }$ induced quasielastic production of hyperons leading to pions
• Recent Developments in Neutrino/Antineutrino - Nucleus Interactions
• Revisiting ${\nu }_{\mu }({\bar{\nu }}_{\mu })$ and ${\nu }_e({\bar{\nu }}_e)$ Induced Quasielastic Scattering from Nuclei in Sub-GeV Energy Region