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• W4367333135 abstract "We test for an anisotropy in the mass of arriving cosmic-ray primaries associated with the galactic plane. The sensitivity to primary mass is obtained through the depth of shower maximum, X max , extracted from hybrid events measured over a 14-year period at the Pierre Auger Observatory. The sky is split into distinct on-and off-plane regions using the galactic latitude of each arriving cosmic ray to form two distributions of X max , which are compared using an Anderson-Darling 2-samples test. A scan over roughly half of the data is used to select a lower threshold energy of 10 18.7 eV and a galactic latitude splitting at | b | = 30°, which are set as a prescription for the remaining data. With these thresholds, the distribution of X max from the on-plane region is found to have a 9.1±1.6 −2.2 +2.1 g/cm 2 shallower mean and a 5.9±2.1 −2.5 +3.5 g/cm 2 narrower width than that of the off-plane region and is observed in all telescope sites independently. These di↵erences indicate that the mean mass of primary particles arriving from the on-plane region is greater than that of those from the off-plane region. Monte Carlo studies yield a 5.9 ×10 −6 random chance probability for the result in the independent data, lowering to a 6.0 × 10 −7 post-penalization random chance probability when the scanned data is included. Accounting for systematic uncertainties leads to an indication for anisotropy in mass composition above 10 18.7 eV with a 3.3 σ -significance. Furthermore, the result has been newly tested using additional FD data recovered from the selection process. This test independently disfavors the on-and off-plane regions being uniform in composition at the 2.2 σ -level, which is in good agreement with the expected sensitivity of the dataset used for this test." @default.
• W4367333135 created "2023-04-30" @default.
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• W4367333135 date "2023-01-01" @default.
• W4367333135 modified "2023-10-14" @default.
• W4367333135 title "Update on the indication of a mass-dependent anisotropy above 10^18.7 eV in the hybrid data of the Pierre Auger Observatory" @default.
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• W4367333135 doi "https://doi.org/10.1051/epjconf/202328303003" @default.
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