196 research outputs found
Atmospheric Lepton Fluxes via Two-Dimensional Matrix Cascade Equations
The atmospheric lepton fluxes play a crucial role in many particle and
astroparticle physics experiments, e.g. in establishing the neutrino signal and
the muon background for neutrino oscillation measurements, or the atmospheric
background for astrophysical neutrino searches. The Matrix Cascade Equations
(MCEq) code is a numerical tool used to model the atmospheric lepton fluxes by
solving a system of coupled differential equations for particle production,
interaction, and decay at extremely low computational costs. Previously, the
MCEq framework only accommodated longitudinal development of air showers, an
approximation that works well for neutrino and muon fluxes at high energies
(O(10 GeV) and above). However, for accurate calculations of atmospheric lepton
angular distributions at lower energies, the lateral component of hadronic
cascades becomes significant, necessitating three-dimensional calculation
schemes. We introduce "2D MCEq", an efficient numerical approach for combined
longitudinal and angular evolution of air showers that retains the low
computational complexity. The accuracy of the "2D MCEq" is affirmed by its
benchmark comparison with the standard Monte Carlo code CORSIKA. This study
paves the way for efficient three-dimensional calculations of atmospheric
neutrino fluxes.Comment: 25 pages, 17 figure
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MINOS Sterile Neutrino Search
The Main Injector Neutrino Oscillation Search (MINOS) is a long-baseline accelerator neutrino experiment designed to measure properties of neutrino oscillation. Using a high intensity muon neutrino beam, produced by the Neutrinos at Main Injector (NuMI) complex at Fermilab, MINOS makes two measurements of neutrino interactions. The first measurement is made using the Near Detector situated at Fermilab and the second is made using the Far Detector located in the Soudan Underground laboratory in northern Minnesota. The primary goal of MINOS is to verify, and measure the properties of, neutrino oscillation between the two detectors using the {nu}{sub {mu}} {yields} V{sub {tau}} transition. A complementary measurement can be made to search for the existence of sterile neutrinos; an oft theorized, but experimentally unvalidated particle. The following thesis will show the results of a sterile neutrino search using MINOS RunI and RunII data totaling {approx}2.5 x 10{sup 20} protons on target. Due to the theoretical nature of sterile neutrinos, complete formalism that covers transition probabilities for the three known active states with the addition of a sterile state is also presented
Multimessenger search for sources of gravitational waves and high-energy neutrinos: Initial results for LIGO-Virgo and IceCube
Probing the origin of cosmic-rays with extremely high energy neutrinos using the IceCube Observatory
Improved limits on dark matter annihilation in the Sun with the 79-string IceCube detector and implications for supersymmetry
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