Publications

Recent Publication Lists: July 2013

High Impact Publications

[2013]

Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector

- Authors: IceCube Collaboration

- Abstract: We report on results of an all-sky search for high-energy neutrino events interacting within the IceCube neutrino detector conducted between May 2010 and May 2012. The search follows up on the previous detection of two PeV neutrino events, with improved sensitivity and extended energy coverage down to approximately 30 TeV. Twenty-six additional events were observed, substantially more than expected from atmospheric backgrounds. Combined, both searches reject a purely atmospheric origin for the twenty-eight events at the 4σ level. These twenty-eight events, which include the highest energy neutrinos ever observed, have flavors, directions, and energies inconsistent with those expected from the atmospheric muon and neutrino backgrounds. These properties are, however, consistent with generic predictions for an additional component of extraterrestrial origin. Science 342, 1242856 (2013)

[2012]

An Absence of Neutrinos Associated with Cosmic-Ray Acceleration in γ-ray Bursts

- Authors: IceCube Collaboration

- Abstract: Very energetic astrophysical events are required to accelerate cosmic rays to above 1018 electronvolts. GRBs (γ-ray bursts) have been proposed as possible candidate sources. In the GRB ‘fireball’ model, cosmic-ray acceleration should be accompanied by neutrinos produced in the decay of charged pions created in interactions between the high-energy cosmic-ray protons and γ-rays. Previous searches for such neutrinos found none, but the constraints were weak because the sensitivity was at best approximately equal to the predicted flux. Here we report an upper limit on the flux of energetic neutrinos associated with GRBs that is at least a factor of 3.7 below the predictions. This implies either that GRBs are not the only sources of cosmic rays with energies exceeding 1018 electronvolts or that the efficiency of neutrino production is much lower than has been predicted. Nature 484, 11068 (2012)

A New Boson with a Mass of 125 GeV Observed with the CMS Experiment at the Large Hardron Collider

- Authors: CMS Collaboration

- Abstract: The Higgs boson was postulated nearly five decades ago within the framework of the standard model of particle physics and has been the subject of numerous searches at accelerators around the world. Its discovery would verify the existence of a complex scalar field thought to give mass to three of the carriers of the electroweak force—the W+, W–, and Z0 bosons—as well as to the fundamental quarks and leptons. The CMS Collaboration has observed, with a statistical significance of five standard deviations, a new particle produced in proton-proton collisions at the Large Hadron Collider at CERN. The evidence is strongest in the diphoton and four-lepton (electrons and/or muons) final states, which provide the best mass resolution in the CMS detector. The probability of the observed signal being due to a random fluctuation of the background is about 1 in 3 × 106. The new particle is a boson with spin not equal to 1 and has a mass of about 125 giga–electron volts. Although its measured properties are, within the uncertainties of the present data, consistent with those expected of the Higgs boson, more data are needed to elucidate the precise nature of the new particle. Science 338, 1230816 (2012)

Select Recent Papers and Conference Proceedings

K. Choi, C. Rott, Y. Itow Impact of Dark Matter Velocity Distributions on Capture Rates in the Sun (submitted JCAP 2013)
Shao-Feng Ge, Kaoru Hagiwara, Carsten Rott Physics of Atmospheric Neutrino Oscillations with a Huge Underground Detector (submitted JCAP 2013)
C. Rott, J.Siegal-Gaskins, J.F.Beacom New Sensitivity to Solar WIMP Annihilation using Low-Energy Neutrinos [arXiv1208.0827] (Phys.Rev. D88 (2013) 055005)
C. Rott Review of Indirect WIMP Search Experiments Nucl.Phys.Proc.Suppl. 235-236 (2013) 413-420
Search for Dark Matter in the MilkyWay with IceCube [ICRC 1187][arXiv1111.2738]
Search strategies for Dark Matter in nearby Dwarf Spheroidal Galaxies with IceCube [ICRC 1024] [arXiv1111.2738]
C. Rott, T. Tanaka, Y. Itow Enhanced Sensitivity to Dark Matter Self-annihilations in the Sun using Neutrino Spectral Information JCAP09(2011)029 [arXiv1107.3182]
C. Rott (corresponding author) Search for Dark Matter from the Galactic Halo with the IceCube Neutrino Observatory [Phys.Rev.D84:022004,2011](arXiv1101.3349)
CCAPP09 - Search for Dark Matter from the Galactic Halo with IceCube [arXiv0912.5183]
ICRC09 - Atmospheric Neutrino Oscillation Measurements with IceCube [ICRC 0785]
ICRC09 - Fundamental Neutrino Measurements with IceCube Deep Core [ICRC 1336]
ICRC09 - WIMP Searches with IceCube [ICRC 0505]
Moriond 09 - Latest Results from the IceCube Neutrino Observatory [paper]
ICHEP08 - Neutrino Oscillation Measurements with IceCube [arXiv:0810.3698]
ICRC07 - The combined AMANDA and IceCube Neutrino Telescope [arXiv:0711.0353]
A Search for scalar bottom quarks from gluino decays in anti-p p collisions at s**(1/2) = 1.96-TeV [Phys.Rev.Lett.96:171802,2006]
A Search for scalar bottom quarks from gluino decays in anti-p p collisions at s**(1/2) = 1.96-TeV [My Ph.D Thesis]