We analyze the distribution of arrival directions of ultra-high-energy cosmic rays recorded at the Pierre Auger Observatory in 10 years of operation. The data set was about three times larger than that used in earlier studies. After updating the fraction of events correlating with the active galactic nuclei (AGNs) in the Véron-Cetty and Véron catalog, we subject the arrival directions of the data with energies in excess of 40 EeV to different tests for anisotropy. None of the tests show statistically significant evidence of anisotropy.
COBISS.SI-ID: 3880955
A measurement of the cosmic-ray spectrum for energies exceeding 4 x 10[sup]18 eV is presented, which is based on the analysis of showers with zenith angles greater than 60° detected with the Pierre Auger Observatory between 1 January 2004 and 31 December 2013. The measured spectrum confirms a flux suppression at the highest energies.
COBISS.SI-ID: 4020987
We present the first hybrid measurement of the average muon number in air showers at ultrahigh energies, initiated by cosmic rays with zenith angles between 62° and 80°. The measurement is based on 174 hybrid events recorded simultaneously with the surface detector array and the fluorescence detector of the Pierre Auger Observatory. The muon number for each shower is derived by scaling a simulated reference profile of the lateral muon density distribution at the ground until it fits the data.
COBISS.SI-ID: 3721723
The dwarf spheroidal satellite galaxies (dSphs) of the Milky Way are some of the most dark matter (DM) dominated objects known. We report on γ-ray observations of Milky Way dSphs based on six years of Fermi Large Area Telescope data processed with the new Pass8 event-level analysis. None of the dSphs are significantly detected in γ rays, and we present upper limits on the DM annihilation cross section from a combined analysis of 15 dSphs.
COBISS.SI-ID: 4105467
We report a search for the charmless hadronic decay B0→ηπ0 with a data sample corresponding to an integrated luminosity of 694 fb−1 containing 753×106 B anti-B pairs. The data were collected by the Belle experiment running on the Υ(4S) resonance at the KEKB e+e− collider. We measure a branching fraction Br(B0→ηπ0)=(4.1+1.7+0.5−1.5−0.7)×10−7, where the first uncertainty is statistical and the second is systematic. Our measurement gives an upper limit of Br(B0→ηπ0)(6.5×10−7 at 90% confidence level. The signal has a significance of 3.0 standard deviations and constitutes the first evidence for this decay mode.
COBISS.SI-ID: 29000743