6533b870fe1ef96bd12d0622
RESEARCH PRODUCT
Flavor Ratio of Astrophysical Neutrinos above 35 TeV in IceCube
Icecube CollaborationM. G. AartsenM. AckermannJ. AdamsJ. A. AguilarM. AhlersM. AhrensD. AltmannT. AndersonC. ArguellesT. C. ArlenJ. AuffenbergX. BaiS. W. BarwickV. BaumR. BayJ. J. BeattyJ. Becker TjusK. -H. BeckerS. BenzviP. BerghausD. BerleyE. BernardiniA. BernhardD. Z. BessonG. BinderD. BindigM. BissokE. BlaufussJ. BlumenthalD. J. BoersmaC. BohmF. BosD. BoseS. BöserO. BotnerL. BrayeurH. -P. BretzA. M. BrownN. BuzinskyJ. CaseyM. CasierE. CheungD. ChirkinA. ChristovB. ChristyK. ClarkL. ClassenF. ClevermannS. CoendersD. F. CowenA. H. Cruz SilvaJ. DaughheteeJ. C. DavisM. DayJ. P. A. M. De AndréC. De ClercqH. DembinskiS. De RidderP. DesiatiK. D. De VriesM. De WithT. DeyoungJ. C. Díaz-vélezJ. P. DummM. DunkmanR. EaganB. EberhardtT. EhrhardtB. EichmannJ. EischS. EulerP. A. EvensonO. FadiranA. R. FazelyA. FedynitchJ. FeintzeigJ. FeldeK. FilimonovC. FinleyT. Fischer-waselsS. FlisK. FrantzenT. FuchsT. K. GaisserR. GaiorJ. GallagherL. GerhardtD. GierL. GladstoneT. GlüsenkampA. GoldschmidtG. GolupJ. G. GonzalezJ. A. GoodmanD. GóraD. GrantP. GretskovJ. C. GrohA. GroßC. HaC. HaackA. Haj IsmailP. HallenA. HallgrenF. HalzenK. HansonD. HebeckerD. HeeremanD. HeinenK. HelbingR. HellauerD. HellwigS. HickfordG. C. HillK. D. HoffmanR. HoffmannA. HomeierK. HoshinaF. HuangW. HuelsnitzP. O. HulthK. HultqvistA. IshiharaE. JacobiJ. JacobsenG. S. JaparidzeK. JeroM. JurkovicB. KaminskyA. KappesT. KargA. KarleM. KauerA. KeivaniJ. L. KelleyA. KheirandishJ. KirylukJ. KläsS. R. KleinJ. -H. KöhneG. KohnenH. KolanoskiA. KoobL. KöpkeC. KopperS. KopperD. J. KoskinenM. KowalskiA. KriestenK. KringsG. KrollM. KrollJ. KunnenN. KurahashiT. KuwabaraM. LabareJ. L. LanfranchiD. T. LarsenM. J. LarsonM. Lesiak-bzdakM. LeuermannJ. LünemannJ. MadsenG. MaggiR. MaruyamaK. MaseH. S. MatisR. MaunuF. McnallyK. MeagherM. MediciA. MeliT. MeuresS. MiareckiE. MiddellE. MiddlemasN. MilkeJ. MillerL. MohrmannT. MontaruliR. MorseR. NahnhauerU. NaumannH. NiederhausenS. C. NowickiD. R. NygrenA. ObertackeA. OlivasA. OmairatA. O'murchadhaT. PalczewskiL. PaulÖ. PenekJ. A. PepperC. Pérez De Los HerosC. PfendnerD. PielothE. PinatJ. PosseltP. B. PriceG. T. PrzybylskiJ. PützM. QuinnanL. RädelM. RameezK. RawlinsP. RedlI. ReesR. ReimannM. RelichE. ResconiW. RhodeM. RichmanB. RiedelS. RobertsonJ. P. RodriguesM. RongenC. RottT. RuheB. RuzybayevD. RyckboschS. M. SabaH. -G. SanderJ. SandroosM. SantanderS. SarkarK. SchattoF. ScheriauT. SchmidtM. SchmitzS. SchoenenS. SchönebergA. SchönwaldA. SchukraftL. SchulteO. SchulzD. SeckelY. SestayoS. SeunarineR. ShanidzeM. W. E. SmithD. SoldinG. M. SpiczakC. SpieringM. StamatikosT. StanevN. A. StanishaA. StasikT. StezelbergerR. G. StokstadA. StößlE. A. StrahlerR. StrömN. L. StrotjohannG. W. SullivanM. SutherlandH. TaavolaI. TaboadaA. TamburroS. Ter-antonyanA. TerliukG. TešićS. TilavP. A. ToaleM. N. TobinD. TosiM. TselengidouE. UngerM. UsnerS. VallecorsaN. Van EijndhovenJ. VandenbrouckeJ. Van SantenS. VanheuleM. VehringM. VogeM. VraegheC. WalckM. WallraffCh. WeaverM. WellonsC. WendtS. WesterhoffB. J. WhelanN. WhitehornC. WicharyK. WiebeC. H. WiebuschD. R. WilliamsH. WissingM. WolfT. R. WoodK. WoschnaggD. L. XuX. W. XuY. XuJ. P. YanezG. YodhS. YoshidaP. ZarzhitskyJ. ZiemannM. Zollsubject
FLUXAMANDAParticle physicsPhysics::Instrumentation and DetectorsENERGIESAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesGeneral Physics and AstronomyFluxCosmic rayAstrophysicsACCELERATION01 natural sciencesflavor : ratioHigh Energy Physics - ExperimentIceCube Neutrino ObservatoryIceCubeHigh Energy Physics - Experiment (hep-ex)PionObservatory0103 physical sciencesddc:550010306 general physicsNeutrino oscillationHigh Energy Astrophysical Phenomena (astro-ph.HE)Physics010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyAstrophysics::Instrumentation and Methods for AstrophysicsSigmashowersCOSMIC-RAYSatmosphere : backgroundtracksneutrino : flavor : rationeutrino : oscillationfluxobservatoryPhysics and Astronomy13. Climate actionHigh Energy Physics::ExperimentNeutrinoAstrophysics - High Energy Astrophysical Phenomenaneutrino : VHEpi : decaydescription
A diffuse flux of astrophysical neutrinos above $100\,\mathrm{TeV}$ has been observed at the IceCube Neutrino Observatory. Here we extend this analysis to probe the astrophysical flux down to $35\,\mathrm{TeV}$ and analyze its flavor composition by classifying events as showers or tracks. Taking advantage of lower atmospheric backgrounds for shower-like 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 $(f_e:f_{\mu}:f_\tau)_\oplus\approx(1:1:1)_\oplus$ flavor ratio at Earth commonly expected from the averaged oscillations of neutrinos produced by pion decay in distant astrophysical sources. Limits are placed on non-standard flavor compositions that cannot be produced by averaged neutrino oscillations but could arise in exotic physics scenarios. A maximally track-like composition of $(0:1:0)_\oplus$ is excluded at $3.3\sigma$, and a purely shower-like composition of $(1:0:0)_\oplus$ is excluded at $2.3\sigma$.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-04-28 |