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Measurements using the inelasticity distribution of multi-TeV neutrino interactions in IceCube
Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch, New Zealand.
Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch, New Zealand.
Univ Libre Bruxelles, Sci Fac, CP230, B-1050 Brussels, Belgium.
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2019 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 99, no 3, article id 032004Article in journal (Refereed) Published
Abstract [en]

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 nu(mu) 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 similar to 1 to similar 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 gamma = 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)(circle plus). Exploiting the distinct inelasticity distribution of nu(mu) and (nu) over bar (mu) interactions, the atmospheric nu(mu) to (nu) over bar (mu) flux ratio in the energy range from 770 GeV to 21 TeV is found to be 0.77(-0.25)(+0.44) 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.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 99, no 3, article id 032004
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-378377DOI: 10.1103/PhysRevD.99.032004ISI: 000458816700001OAI: oai:DiVA.org:uu-378377DiVA, id: diva2:1294339
Funder
Swedish Research CouncilKnut and Alice Wallenberg FoundationAustralian Research CouncilSwedish Polar Research SecretariatSwedish National Infrastructure for Computing (SNIC)Available from: 2019-03-07 Created: 2019-03-07 Last updated: 2019-03-07Bibliographically approved

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Botner, OlgaBurgman, AlexanderHallgren, AllanPérez de los Heros, CarlosUnger, Lisa

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