TL;DR: In this paper, the trident production cross section was computed for different hadronic targets and the number and distribution of trident events at several current and future near detector facilities subjected to intense neutrino beams from accelerators.
Abstract: Neutrino trident scattering is a rare Standard Model process where a charged-lepton pair is produced in neutrino-nucleus scattering. To date, only the dimuon final-state has been observed, with around 100 total events, while the other channels are as yet unexplored. In this work, we compute the trident production cross section by performing a complete four-body phase space calculation for different hadronic targets. This provides a correct estimate both of the coherent and the diffractive contributions to these cross sections, but also allows us to address certain inconsistencies in the literature related to the use of the Equivalent Photon Approximation in this context. We show that this approximation can give a reasonable estimate only for the production of dimuon final-states in coherent scattering, being inadmissible for all other cases considered. We provide estimates of the number and distribution of trident events at several current and future near detector facilities subjected to intense neutrino beams from accelerators: five liquid-argon detectors (SBND, μBooNE, ICARUS, DUNE and νSTORM), the iron detector of T2K (INGRID) and three detectors made of composite material (MINOS, NOνA and MINERνA). We find that for many experiments, trident measurements are an attainable goal and a valuable addition to their near detector physics programme.
TL;DR: In this paper, the authors measured neutrino-induced charged-current (CC) production on carbon nuclei using events with fully imaged final-state proton-π¯¯0-systems.
Abstract: We study neutrino-induced charged-current (CC) π
0 production on carbon nuclei using events
with fully imaged final-state proton-π
0
systems. Novel use of final-state correlations based on
transverse kinematic imbalance enable the first measurements of the struck nucleon’s Fermi motion,
of the intranuclear momentum transfer (IMT) dynamics, and of the final-state hadronic momentum
configuration in neutrino pion production. Event distributions are presented for i) the momenta of
neutrino-struck neutrons below the Fermi surface, ii) the direction of missing transverse momentum
characterizing the strength of IMT, and iii) proton-pion momentum imbalance with respect to the
lepton scattering plane. The observed Fermi motion and IMT strength are compared to the previous
MINERνA measurement of neutrino CC quasielastic-like production. The measured shapes and
absolute rates of these distributions, as well as the cross-section asymmetries show tensions with
predictions from current neutrino generator models.
TL;DR: MINER ν A (Main Injector ExpeRiment ν - A ) is a few-GeV neutrino cross-section experiment that began taking data in the FNAL NuMI (Fermi National Accelerator Laboratory Neutrinos at the Main Injectionor) beam-line in March of 2010 as discussed by the authors.
Abstract: MINER ν A (Main INjector ExpeRiment ν - A ) is a new few-GeV neutrino cross-section experiment that began taking data in the FNAL NuMI (Fermi National Accelerator Laboratory Neutrinos at the Main Injector) beam-line in March of 2010. MINER ν A employs a fine-grained scintillator detector capable of complete kinematic characterization of neutrino interactions. This paper describes the MINER ν A data acquisition system (DAQ) including the readout electronics, software, and computing architecture.
TL;DR: In this article, the influence of nuclear effects on neutrino interaction cross sections and make predictions for charged current quasielastic (QE) scattering, nucleon-knock-out and pion-and kaon-production on a CH target.
Abstract: The MINER$
u$A experiment investigates neutrino interactions with nucleons needed for an understanding of electroweak interactions of hadrons. Since nuclear targets are being used many-body effects may affect the extracted cross sections and the energy reconstruction. The latter is essential for the extraction of neutrino oscillation properties. We investigate the influence of nuclear effects on neutrino interaction cross sections and make predictions for charged current quasielastic (QE) scattering, nucleon-knock-out and pion- and kaon-production on a CH target. The Giessen Boltzmann--Uehling--Uhlenbeck (GiBUU) model is used for the description of neutrino-nucleus reactions. Integrated and differential cross sections for inclusive neutrino scattering, QE processes and particle production for the MINER$
u$A neutrino flux are calculated. The influence of final state interactions on the identification of these processes is discussed. In particular, energy and $Q^2$ reconstruction for the MINER$
u$A flux are critically examined. The $Q^2$ dependence of the inclusive cross sections is found to be sensitive to the energy reconstruction. Cut-offs in flux distributions have a large effect. Final state interactions affect the pion kinetic energy spectra significantly and increase the kaon cross sections by cross feeding from other channels.
TL;DR: Arachne as discussed by the authors is a web-based tool that allows neutrino interaction events in the MINER ν A detector to be viewed by anyone with a web browser, allowing for easy hand-scanning of particle interactions.
Abstract: Neutrino interaction events in the MINER ν A detector are visually represented with a web-based tool called Arachne. Data are retrieved from a central server via AJAX, and client-side JavaScript draws images into the user's browser window using the draft HTML 5 standard. These technologies allow neutrino interactions to be viewed by anyone with a web browser, allowing for easy hand-scanning of particle interactions. Arachne has been used in MINER ν A to evaluate neutrino data in a prototype detector, to tune reconstruction algorithms, and for public outreach and education.