Measurement of the astrophysical diffuse neutrino flux in a combined fit of IceCube’s high energy neutrino data
Richard Naab, Rasha Abbasi, M. Ackermann, Jenni Adams, Sanjib Kumar Agarwalla, Juanan Aguilar, M. Ahlers, Jean-Marco Alameddine, Najia Moureen Binte Amin, K. Andeen, G. Anton, C. Argüelles, Yosuke Ashida, Sofia Athanasiadou, Spencer Axani, X. Bai, Aswathi Balagopal, Moreno Baricevic, S. W. Barwick, Vedant Basu, Ryan Bay, J. J. Beatty, J. Becker Tjus, Jakob Beise, Chiara Bellenghi, Charlotte Benning, S. BenZvi, D. Berley, E. Bernardini, D. Besson, E. Blaufuss, Summer Blot, Federico Bontempo, Julia Book, Caterina Boscolo Meneguolo, Sebastian BOSER, O. Botner, J. Böttcher, Etienne Bourbeau, Jim Braun, Bennett Brinson, Jannes Brostean-Kaiser, Ryan T. Burley, Raffaela Busse, Delaney Butterfield, Michael Campana, Kiara Carloni, Erin Carnie-Bronca, Sharmistha Chattopadhyay, Thien Nhan Chau, Chujie Chen, Zheyang Chen, D. Chirkin, Seowon Choi, Brian Clark, Lew Classen, Alan Coleman, Gabriel Collin, A. Connolly, J. M. Conrad, Paul Coppin, Pablo Correa, D. F. Cowen, Pranav Dave, C. De Clercq, James DeLaunay, Diyaselis Delgado Lopez, Shuyang Deng, Kunal Deoskar, Abhishek Desai, P. Desiati, K. D. de Vries, G. de Wasseige, T. DeYoung, Alejandro Díaz, J. C. Díaz–Vélez, Markus Dittmer, Alba Domi, Hrvoje Dujmović, M. A. DuVernois, Thomas Ehrhardt, P. Eller, Enrico Ellinger, Sharif El Mentawi, Dominik Elsässer, Ralph Engel, Hannah Erpenbeck, John Evans, P. A. Evenson, Kwok Lung Fan, Ke Fang, Kareem Ramadan Farrag, A. R. Fazely, Anatoli Fedynitch, Nora Feigl, Sebastian Fiedlschuster, C. Finley, Leander Fischer, D. B. Fox, A. Franckowiak
Abstract
The IceCube Neutrino Observatory has discovered a diffuse neutrino flux of astrophysical origin and measures its properties in various detection channels. With more than 10 years of data, we use multiple data samples from different detection channels for a combined fit of the diffuse astrophysical neutrino spectrum. This leverages the complementary information of different neutrino event signatures. For the first time, we use a coherent modeling of the signal and background, as well as the detector response and corresponding systematic uncertainties. The detector response is continuously varied during the simulation in order to generate a general purpose Monte Carlo set, which is central to our approach. We present a combined fit yielding a measurement of the diffuse astrophysical neutrino flux properties with unprecedented precision.