1,721,048 research outputs found
First measurement of inclusive electron-neutrino and antineutrino charged current differential cross sections in charged lepton energy on argon in MicroBooNE
Get PDFThis document was prepared by the MicroBooNE collaboration using the resources of the Fermi National Accelerator Laboratory (Fermilab), a U.S. Department of Energy, Office of Science, HEP User Facility. Fermilab is managed by Fermi Research Alliance, LLC (FRA), acting under Contract No. DE-AC02-07CH11359. MicroBooNE is supported by the following: the U.S. Department of Energy, Office of Science, Offices of High Energy Physics and Nuclear Physics; the U.S. National Science Foundation; the Swiss National Science Foundation; the Science and Technology Facilities Council (STFC), part of the United Kingdom Research and Innovation; and The Royal Society (United Kingdom). Additional support for the laser calibration system and CR tagger was provided by the Albert Einstein Center for Fundamental Physics, Bern, Switzerland.We present the first measurement of the single-differential νe þ ν¯e charged-current inclusive cross
sections on argon in electron or positron energy and in electron or positron scattering angle over the full
range. Data were collected using the MicroBooNE liquid argon time projection chamber located off axis
from the Fermilab neutrinos at the main injector beam over an exposure of 2.0 × 1020 protons on target. The
signal definition includes a 60 MeV threshold on the νe or ν¯e energy and a 120 MeV threshold on the
electron or positron energy. The measured total and differential cross sections are found to be in agreement
with the GENIE, NuWro, and GiBUU neutrino generators.Fermi Research Alliance, LLC
DE-AC02-07CH11359High Energy Physics and Nuclear PhysicsUnited Kingdom Research and InnovationNational Science FoundationU.S. Department of EnergyOffice of ScienceScience and Technology Facilities CouncilRoyal SocietySchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschun
Search for long-lived heavy neutral leptons and Higgs portal scalars decaying in the MicroBooNE detector
Get PDFACKNOWLEDGMENTS
This document was prepared by the MicroBooNE
Collaboration using the resources of the Fermi National
Accelerator Laboratory (Fermilab), a U.S. Department of
Energy, Office of Science, HEP User Facility. Fermilab is
managed by Fermi Research Alliance, LLC (FRA), acting
under Contract No. DE-AC02-07CH11359. MicroBooNE
is supported by the following: the U.S. Department of
Energy, Office of Science, Offices of High Energy
Physics and Nuclear Physics; the U.S. National Science Foundation; the Swiss National Science Foundation; the
Science and Technology Facilities Council (STFC), part
of the United Kingdom Research and Innovation; the
Royal Society (United Kingdom); and The European
Union’s Horizon 2020 Marie Skłodowska-Curie Actions.
Additional support for the laser calibration system and
cosmic-ray tagger was provided by the Albert Einstein
Center for Fundamental Physics, Bern, Switzerland. For
the purpose of open access, the authors have applied a
Creative Commons Attribution (CC BY) licence to any
Author Accepted Manuscript version arising from this
submission. We also acknowledge the contributions of
technical and scientific staff to the design, construction,
and operation of the MicroBooNE detector as well as the
contributions of past collaborators to the development of
MicroBooNE analyses, without whom this work would
not have been possible. We particularly acknowledge the
many contributions of Salvatore Davide Porzio to developing
this research direction on MicroBooNE.We present a search for long-lived Higgs portal scalars (HPS) and heavy neutral leptons (HNL) decaying in the MicroBooNE liquid-argon time projection chamber. The measurement is performed using data collected synchronously with the neutrino beam from Fermilab’s Main Injector with a total exposure corresponding to 7.01×1020 protons on target. We set upper limits at the 90% confidence level on the mixing parameter |Uμ4|2 ranging from |Uμ4|2<12.9×10−8 for Majorana HNLs with a mass of mHNL=246 MeV to |Uμ4|2<0.92×10−8 for mHNL=385 MeV, assuming |Ue4|2=|Uτ4|2=0 and HNL decays into μ±π∓ pairs. These limits on |Uμ4|2 represent an order of magnitude improvement in sensitivity compared to the previous MicroBooNE result. We also constrain the scalar-Higgs mixing angle θ by searching for HPS decays into μ+μ− final states, excluding a contour in the parameter space with lower bounds of θ2<31.3×10−9 for mHPS=212 GeV and θ2<1.09×10−9 for mHPS=275 GeV. These are the first constraints on the scalar-Higgs mixing angle θ from a dedicated experimental search in this mass range.European Union’s Horizon 2020 Marie Skłodowska-Curie ActionsFermi Research Alliance, LLC
DE-AC02-07CH11359High Energy Physics and Nuclear PhysicsUnited Kingdom Research and InnovationNational Science FoundationU.S. Department of EnergyOffice of ScienceScience and Technology Facilities CouncilRoyal SocietySchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschun
Electromagnetic shower reconstruction and energy validation with Michel electrons and pi(0) samples for the deep-learning-based analyses in MicroBooNE
Get PDFThis document was prepared by the MicroBooNE collaboration using the resources of the Fermi National Accelerator Laboratory (Fermilab), a U.S. Department of Energy, Office of Science, HEP User Facility. Fermilab is managed by Fermi Research Alliance, LLC (FRA), acting under Contract No. DE-AC02-07CH11359. MicroBooNE is supported by the following: the U.S. Department of Energy, Office of Science, Offices of High Energy Physics and Nuclear Physics; the U.S. National Science Foundation; the Swiss National Science Foundation; the Science and Technology Facilities Council (STFC), part of the United Kingdom Research and Innovation; the Royal Society (United Kingdom); and The European Union's Horizon 2020 Marie Sklodowska-Curie Actions. Additional support for the laser calibration system and cosmic ray tagger was provided by the Albert Einstein Center for Fundamental Physics, Bern, Switzerland.This article presents the reconstruction of the electromagnetic activity from electrons and photons (showers) used in the MicroBooNE deep learning-based low energy electron search. The reconstruction algorithm uses a combination of traditional and deep learning-based techniques to estimate shower energies. We validate these predictions using two nu(mu)-sourced data samples: charged/neutral current interactions with final state neutral pions and charged current interactions in which the muon stops and decays within the detector producing a Michel electron. Both the neutral pion sample and Michel electron sample demonstrate agreement between data and simulation. Further, the absolute shower energy scale is shown to be consistent with the relevant physical constant of each sample: the neutral pion mass peak and the Michel energy cutoff.Fermi Research Alliance, LLC (FRA) DE-AC02-07CH11359United States Department of Energy (DOE)
National Science Foundation (NSF)Swiss National Science Foundation (SNSF)European CommissionScience and Technology Facilities Council (STFC) , part of the United Kingdom Research and InnovationRoyal Society of LondonEuropean Union's Horizon 2020 Marie Sklodowska-Curie ActionsAlbert Einstein Center for Fundamental Physics, Bern, Switzerlan
Novel approach for evaluating detector-related uncertainties in a LArTPC using MicroBooNE data
Get PDFThis document was prepared by the MicroBooNE collaboration using the resources of the Fermi National Accelerator Laboratory (Fermilab), a U.S. Department of Energy, Office of Science, HEP User Facility. Fermilab is managed by Fermi Research Alliance, LLC (FRA), acting under Contract No. DE-AC02-07CH11359. MicroBooNE is supported by the following: the U.S. Department of Energy, Office of Science, Offices of High Energy Physics and Nuclear Physics; the U.S. National Science Foundation; the Swiss National Science Foundation; the Science and Technology Facilities Council (STFC), part of the United Kingdom Research and Innovation; the Royal Society (United Kingdom); and The European Union's Horizon 2020 Marie Sklodowska-Curie Actions. Additional support for the laser calibration system and cosmic ray tagger was provided by the Albert Einstein Center for Fundamental Physics, Bern, Switzerland. We also acknowledge the contributions of technical and scientific staff to the design, construction, and operation of the MicroBooNE detector as well as the contributions of past collaborators to the development of MicroBooNE analyses, without whom this work would not have been possible.Primary challenges for current and future precision
neutrino experiments using liquid argon time projection
chambers (LArTPCs) include understanding detector
effects and quantifying the associated systematic uncertainties.
This paper presents a novel technique for assessing and
propagating LArTPC detector-related systematic uncertainties.
The technique makes modifications to simulation waveforms
based on a parameterization of observed differences
in ionization signals from the TPC between data and simulation,
while remaining insensitive to the details of the detector
model. The modifications are then used to quantify the
systematic differences in low- and high-level reconstructed
quantities. This approach could be applied to future LArTPC
detectors, such as those used in SBN and DUNE.Fermi Research Alliance, LLC (FRA) DE-AC02-07CH11359United States Department of Energy (DOE)National Science Foundation (NSF)Swiss National Science Foundation (SNSF)European CommissionUK Research & Innovation (UKRI)Science & Technology Facilities Council (STFC)Royal Society of LondonEuropean Union's Horizon 2020 Marie Sklodowska-Curie ActionsAlbert Einstein Center for Fundamental Physics, Bern, Switzerlan
Differential cross section measurement of charged current νe interactions without final-state pions in MicroBooNE
Get PDFThis document was prepared by the MicroBooNE
Collaboration using the resources of the Fermi National
Accelerator Laboratory (Fermilab), a U.S. Department of
Energy, Office of Science, HEP User Facility. Fermilab is
managed by Fermi Research Alliance, LLC (FRA), acting
under Contract No. DE-AC02-07CH11359. MicroBooNE
is supported by the following: The U.S. Department of
Energy, Office of Science, Offices of High Energy Physics
and Nuclear Physics; the U.S. National Science Foundation;
the Swiss National Science Foundation; the Science and
Technology Facilities Council (STFC), part of the United
Kingdom Research and Innovation; the Royal Society
(United Kingdom); and the UK Research and Innovation
(UKRI) Future Leaders Fellowship. Additional support for
the laser calibration system and cosmic ray tagger was
provided by the Albert Einstein Center for Fundamental
Physics, Bern, Switzerland. We also acknowledge the
contributions of technical and scientific staff to the design,
construction, and operation of the MicroBooNE detector as
well as the contributions of past collaborators to the
development of MicroBooNE analyses, without whom this
work would not have been possible.In this paper we present the first measurements of an exclusive electron neutrino cross section with the MicroBooNE experiment using data from the Booster neutrino beamline at Fermilab. These measurements are made for a selection of charged-current electron neutrinos without final-state pions. Differential cross sections are extracted in energy and angle with respect to the beam for the electron and the leading proton. The differential cross section as a function of proton energy is measured using events with protons both above and below the visibility threshold. This is done by including a separate selection of electron neutrino events without reconstructed proton candidates in addition to those with proton candidates. Results are compared to the predictions from several modern generators, and we find the data agrees well with these models. The data shows best agreement, as quantified by the p-value, with the generators that predict a lower overall cross section, such as GENIE v3 and NuWro.Fermi Research Alliance, LLC
DE-AC02-07CH11359High Energy Physics and Nuclear PhysicsUnited Kingdom Research and InnovationNational Science FoundationU.S. Department of EnergyOffice of ScienceScience and Technology Facilities CouncilRoyal SocietySchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschun
First Measurement of Quasielastic Λ Baryon Production in Muon Antineutrino Interactions in the MicroBooNE Detector
Get PDFThis document was prepared by the MicroBooNE collaboration using the resources of the Fermi National
Accelerator Laboratory (Fermilab), a U.S. Department of
Energy, Office of Science, HEP User Facility. Fermilab is
managed by Fermi Research Alliance, LLC (FRA), acting
under Contract No. DE-AC02-07CH11359. MicroBooNE is
supported by the following: the U.S. Department of Energy,
Office of Science, Offices of High Energy Physics and
Nuclear Physics; the U.S. National Science Foundation;
the Swiss National Science Foundation; the Science and
Technology Facilities Council (STFC), part of the United
Kingdom Research and Innovation; the Royal Society
(United Kingdom); and the UK Research and Innovation
(UKRI) Future Leaders Fellowship. Additional support for
the laser calibration system and cosmic ray tagger was
provided by the Albert Einstein Center for Fundamental
Physics, Bern, Switzerland. We also acknowledge the contributions of technical and scientific staff to the design,
construction, and operation of the MicroBooNE detector as
well as the contributions of past collaborators to the development of MicroBooNE analyses, without whom this work
would not have been possible.We present the first measurement of the cross section of Cabibbo-suppressed Λ baryon production, using data collected with the MicroBooNE detector when exposed to the neutrinos from the main injector beam at the Fermi National Accelerator Laboratory. The data analyzed correspond to 2.2×10^{20} protons on target running in neutrino mode, and 4.9×10^{20} protons on target running in anti-neutrino mode. An automated selection is combined with hand scanning, with the former identifying five candidate Λ production events when the signal was unblinded, consistent with the GENIE prediction of 5.3±1.1 events. Several scanners were employed, selecting between three and five events, compared with a prediction from a blinded Monte Carlo simulation study of 3.7±1.0 events. Restricting the phase space to only include Λ baryons that decay above MicroBooNE's detection thresholds, we obtain a flux averaged cross section of 2.0_{-1.7}^{+2.2}×10^{-40} cm^{2}/Ar, where statistical and systematic uncertainties are combined.U.S. Department of Energy, Office of Science, HEP User Facility: Fermi National Accelerator Laboratory (Fermilab)Fermi Research Alliance, LLC (FRA) DE-AC02-07CH11359U.S. Department of Energy,
Office of Science, Offices of High Energy Physics and
Nuclear PhysicsU.S. National Science FoundationSwiss National Science FoundationUnited
Kingdom Research and Innovation, Science and
Technology Facilities Council (STFC)Royal SocietyUK Research and Innovation
(UKRI) Future Leaders FellowshipCentro Albert Einstein de Física Fundamental, Berna, Suiza.MicroBooN
First demonstration of O(1 ns) timing resolution in the MicroBooNE liquid argon time projection chamber
Get PDFThis document was prepared by the MicroBooNE collaboration using the resources of the Fermi National Accelerator Laboratory (Fermilab), a U.S. Department of Energy, Office of Science, HEP User Facility. Fermilab is managed by Fermi Research Alliance, LLC (FRA), acting under Contract No. DE-AC02-07CH11359. MicroBooNE is supported by the following: the U.S. Department of Energy, Office of Science, Offices of High Energy Physics and Nuclear Physics; the U.S. National Science Foundation; the Swiss National Science Foundation; the Science and Technology Facilities Council (STFC), part of the United Kingdom Research and Innovation; the Royal Society (United Kingdom); and the UK Research and Innovation (UKRI) Future Leaders Fellowship. Additional support for the laser calibration system and cosmic ray tagger was provided by the Albert Einstein Center for Fundamental Physics, Bern, Switzerland. We also acknowledge the contributions of technical and scientific staff to the design, construction, and operation of the MicroBooNE detector as well as the contributions of past collaborators to the development of MicroBooNE analyses, without whom this work would not have been possible.MicroBooNE is a neutrino experiment located in the Booster Neutrino Beamline (BNB) at Fermilab, which collected data from 2015 to 2021. MicroBooNE’s liquid argon time projection chamber (LArTPC) is accompanied by a photon detection system consisting of 32 photomultiplier tubes used to measure the argon scintillation light and determine the timing of neutrino interactions. Analysis techniques combining light signals and reconstructed tracks are applied to achieve a neutrino interaction time resolution of O(1 ns). The result obtained allows MicroBooNE to access the nanosecond beam structure of the BNB for the first time. The timing resolution achieved will enable significant enhancement of cosmic background rejection for all neutrino analyses. Furthermore, the ns timing resolution opens new avenues to search for long-lived-particles such as heavy neutral leptons in MicroBooNE, as well as in future large LArTPC experiments, namely the SBN program and DUNE.Fermi Research Alliance, LLC
DE-AC02-07CH11359High Energy Physics and Nuclear PhysicsUnited Kingdom Research and InnovationNational Science Foundation
NSFU.S. Department of Energy
USDOEOffice of Science
SCUK Research and Innovation
UKRIScience and Technology Facilities Council
STFCRoyal SocietySchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
SN
Measurement of the flux-averaged inclusive charged-current electron neutrino and antineutrino cross section on argon using the NuMI beam and the MicroBooNE detector
Get PDFThis document was prepared by the MicroBooNE Collaboration using the resources of the Fermi National Accelerator Laboratory (Fermilab), a U.S. Department of Energy, Office of Science, HEP User Facility. Fermilab is managed by Fermi Research Alliance, LLC (FRA), acting under Contract No. DE-AC02-07CH11359. MicroBooNE is supported by the following: the U.S. Department of Energy, Office of Science, Offices of High Energy Physics and Nuclear Physics; the U.S. National Science Foundation; the Swiss National Science Foundation; the Science and Technology Facilities Council (STFC), part of the United Kingdom Research and Innovation; and The Royal Society (United Kingdom). Additional support for the laser calibration system and cosmic-ray tagger was provided by the Albert Einstein Center for Fundamental Physics, Bern, Switzerland.We present a measurement of the combined nu(e) + (nu) over bar (e) flux-averaged charged-current inclusive cross section on argon using data from the MicroBooNE liquid argon time projection chamber (LArTPC) at Fermilab. Using the off-axis flux from the NuMI beam, MicroBooNE has reconstructed 214 candidate nu(e) + (nu) over bar (e) interactions with an estimated exposure of 2.4 x 10(20) protons on target. Given the estimated purity of 38.6%, this implies the observation of 80 nu(e) + (nu) over bar (e) events in argon, the largest such sample to date. The analysis includes the first demonstration of a fully automated application of a dE/dx-based particle discrimination technique of electron- and photon-induced showers in a LArTPC neutrino detector. The main background for this first nu(e) analysis is cosmic ray contamination. Significantly higher purity is expected in underground detectors, as well as with next-generation reconstruction algorithms. We measure the nu(e) + (nu) over bar (e) flux-averaged charged-current total cross section to be 6.84 +/- 1.51(stat) +/- 2.33(sys) x 10(-39) cm(2)/nucleon, for neutrino energies above 250 MeVand an average neutrino flux energy of 905 MeV when this threshold is applied. The measurement is sensitive to neutrino events where the final state electron momentum is above 48 MeV/c, includes the entire angular phase space of the electron, and is in agreement with the theoretical predictions from GENIE and NuWro. This measurement is also the first demonstration of electron-neutrino reconstruction in a surface LArTPC in the presence of cosmic-ray backgrounds, which will be a crucial task for surface experiments like those that comprise the short-baseline neutrino program at Fermilab.Fermi Research Alliance, LLC (FRA) DE-AC02-07CH11359United States Department of Energy (DOE)
National Science Foundation (NSF)Swiss National Science Foundation (SNSF)European CommissionScience and Technology Facilities Council (STFC), United Kingdom Research and InnovationRoyal Society of Londo
First Measurement of Energy-Dependent Inclusive Muon Neutrino Charged-Current Cross Sections on Argon with the MicroBooNE Detector
Get PDFThis document was prepared by the MicroBooNE
Collaboration using the resources of the Fermi National
Accelerator Laboratory (Fermilab), a U.S. Department of
Energy, Office of Science, HEP User Facility. Fermilab is
managed by Fermi Research Alliance, LLC (FRA), acting
under Contract No. DE-AC02-07CH11359. MicroBooNE
is supported by the following: the U.S. Department of
Energy, Office of Science, Offices of High Energy Physics
and Nuclear Physics; the U.S. National Science
Foundation; the Swiss National Science Foundation; the
Science and Technology Facilities Council (STFC), part of
the United Kingdom Research and Innovation; the Royal
Society (United Kingdom); and the European Union’s
Horizon 2020 Marie Sklodowska-Curie Actions.
Additional support for the laser calibration system and
cosmic ray tagger was provided by the Albert Einstein
Center for Fundamental Physics, Bern, Switzerland. We
also acknowledge the contributions of technical and scientific
staff to the design, construction, and operation of the
MicroBooNE detector as well as the contributions of past
collaborators to the development of MicroBooNE analyses,
without whom this work would not have been possible.We report a measurement of the energy-dependent total charged-current cross section σ(Eν) for inclusive muon neutrinos scattering on argon, as well as measurements of flux-averaged differential cross sections as a function of muon energy and hadronic energy transfer (ν). Data corresponding to 5.3×1019 protons on target of exposure were collected using the MicroBooNE liquid argon time projection chamber located in the Fermilab booster neutrino beam with a mean neutrino energy of approximately 0.8 GeV. The mapping between the true neutrino energy Eν and reconstructed neutrino energy Erecν and between the energy transfer ν and reconstructed hadronic energy Erechad are validated by comparing the data and Monte Carlo (MC) predictions. In particular, the modeling of the missing hadronic energy and its associated uncertainties are verified by a new method that compares the Erechad distributions between data and a MC prediction after constraining the reconstructed muon kinematic distributions, energy, and polar angle to those of data. The success of this validation gives confidence that the missing energy in the MicroBooNE detector is well modeled and underpins first-time measurements of both the total cross section σ(Eν) and the differential cross section dσ/dν on argon.High Energy Physics and Nuclear PhysicsUnited Kingdom Research and InnovationNational Science FoundationU.S. Department of EnergyOffice of ScienceScience and Technology Facilities CouncilRoyal SocietySchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschun
Observation of radon mitigation in MicroBooNE by a liquid argon filtration system
Get PDFAcknowledgments
We gratefully acknowledge the discussions, feedback, and encouragement of Hugh Lippincott and
Stephen Pordes throughout the course of the planning, execution, and analysis of our data.
This documentwas prepared by the MicroBooNE collaboration using the resources of the Fermi
National Accelerator Laboratory (Fermilab), a U.S. Department of Energy, Office of Science, HEP
User Facility. Fermilab is managed by Fermi Research Alliance, LLC (FRA), acting under Contract
No. DE-AC02-07CH11359. MicroBooNE is supported by the following: the U.S. Department of
Energy, Office of Science, Offices of High Energy Physics and Nuclear Physics; the U.S. National
Science Foundation; the Swiss National Science Foundation; the Science and Technology Facilities
Council (STFC), part of the United Kingdom Research and Innovation; the Royal Society (United
Kingdom); and The European Union’s Horizon 2020 Marie Skłodowska-Curie Actions. Additional
support for the laser calibration system and cosmic ray tagger was provided by the Albert Einstein
Center for Fundamental Physics, Bern, Switzerland. We also acknowledge the contributions of
technical and scientific staff to the design, construction, and operation of the MicroBooNE detector
as well as the contributions of past collaborators to the development of MicroBooNE analyses,
without whom this work would not have been possible.he MicroBooNE liquid argon time projection chamber (LArTPC) maintains a high level of liquid argon purity through the use of a filtration system that removes electronegative contaminants in continuously-circulated liquid, recondensed boil off, and externally supplied argon gas. We use the MicroBooNE LArTPC to reconstruct MeV-scale radiological decays. Using this technique we measure the liquid argon filtration system's efficacy at removing radon. This is studied by placing a 500 kBq 222Rn source upstream of the filters and searching for a time-dependent increase in the number of radiological decays in the LArTPC. In the context of two models for radon mitigation via a liquid argon filtration system, a slowing mechanism and a trapping mechanism, MicroBooNE data supports a radon reduction factor of greater than 97% or 99.999%, respectively. Furthermore, a radiological survey of the filters found that the copper-based filter material was the primary medium that removed the 222Rn. This is the first observation of radon mitigation in liquid argon with a large-scale copper-based filter and could offer a radon mitigation solution for future large LArTPCs.Fermi
National Accelerator Laboratory (Fermilab)U.S. Department of EnergyOffice of ScienceHEP
User FacilityFermi Research Alliance, LLC (FRA), acting under Contract
No. DE-AC02-07CH11359Offices of High Energy Physics and Nuclear PhysicsU.S. National
Science FoundationSwiss National Science FoundationScience and Technology Facilities
Council (STFC)United Kingdom Research and InnovationRoyal Society (United
Kingdom)European Union’s Horizon 2020 Marie Skłodowska-Curie ActionsAlbert Einstein
Center for Fundamental Physic
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