Detection of anisotropies in the arrival directions of 600 GeV–10TeV cosmic rays with the ARGO-YBJ experiment

ARGO-YBJ is an RPC “carpet” aimed to the detection of extensive air showers induced by charged cosmic rays and gamma-rays in the energy range GeV–PeV. The data-set collected since November 2007 has been analyzed and very significant anisotropies (more than 10 standard deviations), with relative intensity of the order of 10−3 have been found. The observation is not explained with the current models of galactic magnetic field and propagation of cosmic rays in the Galaxy

A needlet-based approach to the shower-mode data analysis in the ARGO-YBJ experiment

The ARGO-YBJ experiment, located at the Yangbajing Cosmic Ray Laboratory (Tibet, 4300 m a.s.l., 606 g/cm2), is an EAS-array exploiting the full coverage approach at high altitude. The large field of view (2 sr) and the low energy threshold (few hundreds of GeV) result in a trigger rate of ∼3.5kHz and ∼1011EAS collected per year. Such a data set contains signals laying on different angular scales: point-like and extended gamma-ray sources, as well as large and intermediate scale cosmic-ray anisotropies. The separation of all these contributions is crucial, mostly when they overlap with each other. Needlets are a new form of spherical wavelets that have recently drawn a lot of attention in the cosmological literature, especially in connection with the analysis of CMB data. Needlets enjoy a number of important statistical and numerical properties which suggest that they can be very effective in handling cosmic-ray and gamma-ray data analysis. An unprecedented application to astroparticle physics is shown here. In particular, we focus on their use for background estimation, which is expected to be optimal or nearly-optimal in a well-defined mathematical sense, and for point-source detection. This technique is applied here to the ARGO-YBJ data set, stressing its advantages with respect to standard methods

Updates on long-term alignment monitoring and diagnostics for ATLAS ID misalignments

This work deals with the alignment of ID tracker modules of the ATLAS experiment at the LH