We present the first statistically significant detection of neutrino oscillations in the high-energy regime (>20 GeV) from an analysis of IceCube Neutrino Observatory data collected in 2010 and 2011. This measurement is made possible by the low-energy threshold of the DeepCore detector (~20 GeV) and benefits from the use of the IceCube detector as a veto against cosmic-ray-induced muon background. The oscillation signal was detected within a low-energy muon neutrino sample (20-100 GeV) extracted from data collected by DeepCore. A high-energy muon neutrino sample (100 GeV-10 TeV) was extracted from IceCube data to constrain systematic uncertainties. The disappearance of low-energy upward-going muon neutrinos was observed, and the nonoscillation hypothesis is rejected with more than 5σ significance. In a two-neutrino flavor formalism, our data are best described by the atmospheric neutrino oscillation parameters |Δm(32)(2)|=(2.3(-0.5)(+0.6))×10(-3) eV(2) and sin(2)(2θ(23))>0.93, and maximum mixing is favored.

Aartsen, MG

Abbasi, R

Abdou, Y

Ackermann, M

Adams, J

Aguilar, JA

Ahlers, M

Altmann, D

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Labare, M

Landsman, H

Larson, MJ

Lesiak-Bzdak, M

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Resconi, E

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Richman, M

Riedel, B

Rodrigues, JP

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Saba, SM

Salameh, T

Sander, H-G

Santander, M

Sarkar, S

Schatto, K

Scheel, M

Scheriau, F

Schmidt, T

Schmitz, M

Schoenen, S

Schöneberg, S

Schönwald, A

Schukraft, A

Schulte, L

Schulz, O

Seckel, D

Sestayo, Y

Seunarine, S

Sheremata, C

Smith, MWE

Soldin, D

Spiczak, GM

Spiering, C

Stamatikos, M

Stanev, T

Stasik, A

Stezelberger, T

Stokstad, RG

Stößl, A

Strahler, EA

Ström, R

Sullivan, GW

Taavola, H

Taboada, I

Tamburro, A

Tepe, A

Ter-Antonyan, S

Tešić, G

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Toale, PA

Toscano, S

Usner, M

van der Drift, D

van Eijndhoven, N

Van Overloop, A

van Santen, J

Vehring, M

Voge, M

Vraeghe, M

Walck, C

Waldenmaier, T

Wallraff, M

Wasserman, R

Weaver, Ch

Wellons, M

Wendt, C

Westerhoff, S

Whitehorn, N

Wiebe, K

Wiebusch, CH

Williams, DR

Wissing, H

Wolf, M

Wood, TR

Woschnagg, K

Xu, C

Xu, DL

Xu, XW

Yanez, JP

Yodh, G

Yoshida, S

Zarzhitsky, P

Ziemann, J

Zierke, S

Zoll, M

IceCube Collaboration

published 

August 23, 2013

General Physics

Physical Review Letters  Journal