Abstract

The flux of high-energy neutrinos passing through the Earth is attenuated due to their interactions with matter. The interaction rate is modulated by the neutrino interaction cross section and affects the flux arriving at the IceCube Neutrino Observatory, a cubic-kilometer neutrino detector embedded in the Antarctic ice sheet. We present a measurement of the neutrino cross section between 60 TeV and 10 PeV using the high-energy starting events (HESE) sample from IceCube with 7.5 years of data. The result is binned in neutrino energy and obtained using both Bayesian and frequentist statistics. We find it compatible with predictions from the Standard Model. Flavor information is explicitly included through updated morphology classifiers, proxies for the the three neutrino flavors. This is the first such measurement to use the three morphologies as observables and the first to account for neutrinos from tau decay.

Highlights

  • In the Standard Model (SM), neutrino interactions are mediated by WÆ and Z0 bosons for charged-current (CC) and neutral-current (NC) channels, respectively

  • As the scale factor is applied across the entire interval within an energy bin on the CSMS calculations, the shape is preserved within each bin

  • The central point in each energy bin corresponds to the expected, most probable energy in dNMC=d log E, the distribution of events in the Monte Carlo (MC) along the x axis. This is chosen in lieu of the linear or logarithmic bin center to better represent where most of the statistical power lies in each bin

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Summary

Introduction

In the Standard Model (SM), neutrino interactions are mediated by WÆ and Z0 bosons for charged-current (CC) and neutral-current (NC) channels, respectively. At energies above a few GeV, the dominant process is deep inelastic scattering (DIS) off of individual partons within the nucleon. Calculations in the perturbative QCD (pQCD) formalism rely on parton distribution functions (PDFs) obtained mostly from DIS experiments [1,2,3]. An alternative approach [4] based on an empirical color dipole model of the nucleon along with the assumption that all cross sections increase at high energies as ln s results in good agreement with the latest pQCD calculations.

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