Probing C P violation with the first three years of ultrahigh energy neutrinos from IceCube

The IceCube Collaboration has recently announced the discovery of ultrahigh energy neutrinoevents. These neutrinoscan be used to probe their production source, as well as leptonicmixing parameters. In this work, we have used the first IceCube data to constrain the leptonic$ CP$ violatingphase ${\ensuremath{\delta}}_{CP}$. For this, we have analyzed the data in the form of flux ratios. We find that the fit to ${\ensuremath{\delta}}_{CP}$ depends on the assumptions made on the production mechanism of these astrophyscial neutrinos. Consequently, we also use this data to impose constraints on the sources of the neutrinos.