Measurements Using the Inelasticity Distribution of Multi-TeV Neutrino Interactions in IceCube

Show simple item record Santander, Marcos 2019-06-26T16:25:10Z 2019-06-26T16:25:10Z 2019-02-13 en_US
dc.identifier.citation Aartsen, M. G., et al. (2019): Measurements Using the Inelasticity Distribution of Multi-TeV Neutrino Interactions in IceCube. Physical Review D, 99(3). DOI: en_US
dc.description.abstract Inelasticity, the fraction of a neutrino’s energy transferred to hadrons, is a quantity of interest in the study of astrophysical and atmospheric neutrino interactions at multi-TeV energies with IceCube. In this work, a sample of contained neutrino interactions in IceCube is obtained from five years of data and classified as 2650 tracks and 965 cascades. Tracks arise predominantly from charged-current v_μ interactions, and we demonstrate that we can reconstruct their energy and inelasticity. The inelasticity distribution is found to be consistent with the calculation of Cooper-Sarkar et al. across the energy range from ∼ 1 to ∼ 100 TeV. Along with cascades from neutrinos of all flavors, we also perform a fit over the energy, zenith angle, and inelasticity distribution to characterize the flux of astrophysical and atmospheric neutrinos. The energy spectrum of diffuse astrophysical neutrinos is described well by a power law in both track and cascade samples, and a best-fit index γ = 2.62 ± 0.07 is found in the energy range from 3.5 TeV to 2.6 PeV. Limits are set on the astrophysical flavor composition and are compatible with a ratio of (1/3 : 1/3 : 1/3)_⊕. Exploiting the distinct inelasticity distribution of v_μ and v̅_μ interactions, the atmospheric v_μ to v̅_μ flux ratio in the energy range from 770 GeV to 21 TeV is found to be 0.77^+0.44_-0.25 times the calculation by Honda et al. Lastly, the inelasticity distribution is also sensitive to neutrino charged-current charm production. The data are consistent with a leading-order calculation, with zero charm production excluded at 91% confidence level. Future analyses of inelasticity distributions may probe new physics that affects neutrino interactions both in and beyond the Standard Model. en_US
dc.format.mimetype application/pdf en_US
dc.language English en_US
dc.subject Particles & Fields en_US
dc.subject Gravitation, Cosmology & Astrophysics en_US
dc.subject Cosmic ray & astroparticle detectors en_US
dc.subject Extrasolar neutrino astronomy en_US
dc.subject Particle astrophysics en_US
dc.subject Particle interactions en_US
dc.subject Charm quark en_US
dc.subject Neutrinos en_US
dc.subject Machine learning en_US
dc.subject Neutrino detectors en_US
dc.title Measurements Using the Inelasticity Distribution of Multi-TeV Neutrino Interactions in IceCube en_US
dc.type text en_US

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