Flavor Ratio of Astrophysical Neutrinos above 35 TeV in IceCube.

  title={Flavor Ratio of Astrophysical Neutrinos above 35 TeV in IceCube.},
  author={Mark G. Aartsen and Markus Ackermann and J. H. Adams and Juan Antonio Aguilar and Markus Ahlers and Maximilian Ahrens and David Altmann and Tyler Brooks Anderson and Carlos A. Arguelles and Timothy C. Arlen and Jan Auffenberg and Xinhua Bai and Steven W. Barwick and V. Baum and Ryan Bay and James J. Beatty and Julia Becker Tjus and Kathrin Becker and Segev BenZvi and Patrick Berghaus and David Berley and Elisa Bernardini and Anna Bernhard and David Z. Besson and Gary Binder and Daniel Bindig and Martin Bissok and Erik Blaufuss and Jan Blumenthal and David J. Boersma and Christian Bohm and Fabian Bos and Debanjan Bose and Sebastian B{\"o}ser and Olga Botner and Lionel Brayeur and Hans-Peter Bretz and A. M. Brown and N. Buzinsky and James Casey and Martin Casier and E. Cheung and Dmitry Chirkin and Asen Christov and Brian John Christy and Ken Clark and Lew Classen and Fabian Clevermann and Stefan Coenders and D. F. Cowen and A. H. Cruz Silva and Jacob Daughhetee and J. C. Davis and Melanie Day and Jo{\~a}o Pedro Athayde Marcondes de Andr{\'e} and C. De Clercq and Hans Peter Dembinski and Sam De Ridder and Paolo Desiati and K. D. de Vries and M. de With and Tyce DeYoung and Juan Carlos D{\'i}az-V{\'e}lez and Jonathan Dumm and Matthew Dunkman and Ryan Eagan and Benjamin Eberhardt and Thomas Ehrhardt and Bj{\"o}rn Eichmann and Jonathan Eisch and Sebastian Euler and Paul A. Evenson and O. Fadiran and Ali R. Fazely and Anatoli Fedynitch and Jacob Feintzeig and John Felde and Kirill Filimonov and Chad Finley and Tobias Fischer-Wasels and Samuel Flis and Katharina Frantzen and T. Fuchs and Thomas K. Gaisser and Romain Gaior and J. Gallagher and Lisa Marie Gerhardt and D. Gier and Laura E. Gladstone and Thorsten Gl{\"u}senkamp and Azriel Goldschmidt and Geraldina Golup and J. G. Gonzalez and Jordan A. Goodman and Dariusz G{\'o}ra and Darren Grant and Pavel Gretskov and John C. Groh and Axel Gro{\ss} and Chang Hyon Ha and Christian Haack and Abd Al Karim Haj Ismail and P. van der Hallen and Allan Hallgren and Francis Halzen and Kael D. Hanson and Dustin Hebecker and David Heereman and Dirk Heinen and Klaus Helbing and Robert Eugene Hellauer and Denise Hellwig and Stephanie Virginia Hickford and Gary C. Hill and K. D. Hoffman and Ruth Hoffmann and Andreas Homeier and Kotoyo Hoshina and Feifei Huang and Warren Huelsnitz and Per Olof Hulth and Klas Hultqvist and Aya Ishihara and Emanuel Jacobi and Janet S. Jacobsen and George S. Japaridze and Kyle Jero and Matej Jurkovi{\vc} and Basho Kaminsky and Alexander Kappes and Timo Karg and Albrecht Karle and Matthew Kauer and Azadeh Keivani and John Lawrence Kelley and Ali Kheirandish and Joanna Kiryluk and J. Kl{\"a}s and Spencer R. Klein and Jan-Hendrik K{\"o}hne and Georges Kohnen and Hermann Kolanoski and A. Koob and Lutz K{\"o}pke and Claudio Kopper and Sandro Kopper and D. Jason Koskinen and Marek Kowalski and Anna Kriesten and Kai Michael Krings and G{\"o}sta Kroll and Mike Kroll and Jan Kunnen and Naoko Kurahashi and Takao Kuwabara and Mathieu L. M. Labare and Justin Lanfranchi and Donald T. Larsen and Michael James Larson and Mariola Lesiak-Bzdak and Martin Leuermann and Jan D. L{\"u}nemann and J. Madsen and Giuliano Maggi and Reina Maruyama and Keiichi Mase and Howard S. Matis and Ryan Maunu and Frank McNally and Kevin J. Meagher and Morten Medici and Athina Meli and Thomas Meures and Sandra Miarecki and Eike Middell and Erin Middlemas and Natalie Milke and J. Miller and Lars Mohrmann and Teresa Montaruli and Robert Morse and Rolf Nahnhauer and Uwe Naumann and Hans Niederhausen and Sarah C. Nowicki and David R. Nygren and Anna Obertacke and Alexander R. Olivas and Ahmad Omairat and Aongus O'Murchadha and Tomasz Palczewski and Larissa Paul and {\"O}mer Penek and Joshua A. Pepper and Carlos P{\'e}rez de los Heros and Carl Pfendner and Damian Pieloth and Elisa Pinat and Jonas Posselt and P. Buford Price and Gerald T. Przybylski and J. P{\"u}tz and Melissa Quinnan and Leif R{\"a}del and M. Rameez and Katherine Rawlins and Peter Christian Redl and I. Rees and Ren{\'e} Reimann and Matthew Relich and Elisa Resconi and Wolfgang Rhode and Michael Richman and Benedikt Riedel and S. M. Robertson and Jo{\~a}o Paulo Rodrigues and Martin Rongen and Carsten Rott and Tim Ruhe and Bakhtiyar Ruzybayev and Dirk Ryckbosch and Sabine M. Saba and Heinz Georg Sander and J. Sandroos and Marcos Santander and Subir Sarkar and Kai Schatto and Florian Scheriau and Timothy W. Schmidt and Martin Schmitz and Sebastian Schoenen and Sebastian Sch{\"o}neberg and Arne Sch{\"o}nwald and Anne Schukraft and Lukas Schulte and O. Schulz and David Seckel and Yolanda Sestayo and Surujhdeo Seunarine and Rezo Shanidze and M. W. E. Smith and Dennis Soldin and G. M. Spiczak and Christian Spiering and Michael Stamatikos and Todor Stanev and Nick A. Stanisha and Alexander Stasik and Thorsten Stezelberger and Robert G. Stokstad and Achim St{\"o}{\ss}l and Erik A. Strahler and Rickard Str{\"o}m and Nora Linn Strotjohann and Gregory W. Sullivan and Henric Taavola and Ignacio Taboada and Alessio Tamburro and Samvel Ter-Antonyan and Andrii Terliuk and Gordana Tesic and Serap Tilav and Patrick A. Toale and M. N. Tobin and Delia Tosi and Maria Tselengidou and Elisabeth Unger and Marcel Usner and Sofia Vallecorsa and Nick van Eijndhoven and Justin Vandenbroucke and J. van Santen and Stijn Vanheule and Markus Vehring and Markus Voge and Matthias Vraeghe and Christian Walck and Marius Wallraff and C. Weaver and Mark Wellons and C. Wendt and Stefan Westerhoff and B. J. Whelan and Nathan Whitehorn and C. Wichary and Klaus Wiebe and Christopher Wiebusch and D. R. W. Williams and Henrike Wissing and Martin Wolf and Terri R. Wood and Kurt Woschnagg and D. L. Xu and X. Xu and Y. Xu and Juan Pablo Y{\'a}{\~n}ez and Gaurang B. Yodh and Shigeru Yoshida and Pavel Zarzhitsky and Jan Ziemann and Marcel Zoll},
  journal={Physical review letters},
  volume={114 17},
A diffuse flux of astrophysical neutrinos above 100 TeV has been observed at the IceCube Neutrino Observatory. Here we extend this analysis to probe the astrophysical flux down to 35 TeV and analyze its flavor composition by classifying events as showers or tracks. Taking advantage of lower atmospheric backgrounds for showerlike events, we obtain a shower-biased sample containing 129 showers and 8 tracks collected in three years from 2010 to 2013. We demonstrate consistency with the (fe:fμ:f… 

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