This paper describes the design and construction of the MicroBooNE liquid argon time projection chamber and associated systems. MicroBooNE is the first phase of the Short Baseline Neutrino program, located at Fermilab, and will utilize the capabilities of liquid argon detectors to examine a rich assortment of physics topics. In this document details of design specifications, assembly procedures, and acceptance tests are reported.

We present a measurement of neutrino tridents, muon pairs induced by neutrino scattering in the Coulomb field of a target nucleus, in the Columbia-Chicago-Fermilab-Rochester neutrino experiment at the Fermilab Tevatron. The observed number of tridents after geometric and kinematic corrections, 37.0 ± 12.4, supports the standard-model prediction of 45.3 ± 2.3 events. This is the first demonstration of the W-Z destructive interference from neutrino tridents, and rules out, at 99% C.L., the V -A prediction without the interference.PACS numbers: 13.10.+q, 12.15.Ji, 14.80.Er, 25.30.Pt A neutrino trident is the scattering of a neutrino in the Coulomb field of a target nucleus (TV),

The ProtoDUNE-SP detector is a single-phase liquid argon time projection chamber with an active volume of 7.2× 6.1× 7.0 m3. It is installed at the CERN Neutrino Platform in a specially-constructed beam that delivers charged pions, kaons, protons, muons and electrons with momenta in the range 0.3 GeV/c to 7 GeV/c. Beam line instrumentation provides accurate momentum measurements and particle identification. The ProtoDUNE-SP detector is a prototype for the first far detector module of the Deep Underground Neutrino Experiment, and it incorporates full-size components as designed for that module. This paper describes the beam line, the time projection chamber, the photon detectors, the cosmic-ray tagger, the signal processing and particle reconstruction. It presents the first results on ProtoDUNE-SP's performance, including noise and gain measurements, dE/dx calibration for muons, protons, pions and electrons, drift electron lifetime measurements, and photon detector noise, signal sensitivity and time resolution measurements. The measured values meet or exceed the specifications for the DUNE far detector, in several cases by large margins. ProtoDUNE-SP's successful operation starting in 2018 and its production of large samples of high-quality data demonstrate the effectiveness of the single-phase far detector design.

The deep underground neutrino experiment (DUNE), a 40-kton underground liquid argon time projection chamber experiment, will be sensitive to the electron-neutrino flavor component of the burst of neutrinos expected from the next Galactic core-collapse supernova. Such an observation will bring unique insight into the astrophysics of core collapse as well as into the properties of neutrinos. The general capabilities of DUNE for neutrino detection in the relevant few- to few-tens-of-MeV neutrino energy range will be described. As an example, DUNE’s ability to constrain the $$\nu _e$$ ν e spectral parameters of the neutrino burst will be considered.

We present an improved determination of the proton structure functions F2 and xF3 from the CCFR ν-Fe deep inelastic scattering (DIS) experiment. Comparisons to high-statistics chargedlepton scattering results for F2 from the NMC, E665, SLAC, and BCDMS experiments, after correcting for quark-charge and heavy-target effects, indicate good agreement for x > 0.1 but some discrepancy at lower x. The Q 2 evolution of both the F2 and xF3 structure functions yields the quantum chromodynamics (QCD) scale parameter Λ NLO,(4) M S = 337 ± 28(exp.) M eV . This corresponds to a value of the strong coupling constant at the scale of mass of the Z-boson of αS(M 2 Z ) = 0.119 ± 0.002(exp.)±0.004(theory) and is one of the most precise measurements of this quantity.PACS numbers: 13.15.+g, 12.38. Qk, 24.85.+p, 25.30.Pt High-energy neutrinos are a unique probe for testing QCD and understanding the parton properties of nucleon structure. Combinations of neutrino and antineutrino scattering data are used to determine the F 2 and xF 3 structure functions (SFs) which determine the valence, sea, and gluon parton distributions in the nucleon [1,2]. The universalities of parton distributions can also be studied by comparing neutrino and charged-lepton scattering data. Past measurements have indicated that F ν 2 differs from F e/µ 2 by 10-20% in the low-x region. These differences are larger than the quoted experimental errors of the measurements and may indicate the need for modifications of the theoretical modeling to include higher-order or new physics contributions. QCD predicts the scaling violations (Q 2 dependence) of F 2 and xF 3 and, experimentally, the observed scaling violations can be tested against those predictions to determine α S [3] or the related QCD scale parameter, Λ QCD . The α S determination from neutrino scattering has a small theoretical uncertainty since the electroweak radiative corrections, scale uncertainties, and next-to-leading order (NLO) corrections are well understood.In this paper, we present an updated analysis of the Columbia-Chicago-Fermilab-Rochester (CCFR) collaboration neutrino scattering data with improved estimates of quark model parameters [4] and systematic uncertainties. The α S measurement from this analysis is one of the most precise due to the high energy and statistics of the experiment compared to previous measurements [5,6].