Measurement of the proton-air cross section at √s=57TeV with the Pierre Auger observatory

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doi:10.1103/PhysRevLett.109.062002

We report a measurement of the proton-air cross section for particle production at the center-of-mass energy per nucleon of 57 TeV. This is derived from the distribution of the depths of shower maxima observed with the Pierre Auger Observatory: systematic uncertainties are studied in detail. Analyzing the tail of the distribution of the shower maxima, a proton-air cross section of [505±22(stat)-36+28(syst)]mb is found. © 2012 American Physical Society.

Abreu, P., Aglietta, M., Ahn, E., Albuquerque, I., Allard, D., Allekotte, I., et al. (2012). Measurement of the proton-air cross section at √s=57TeV with the Pierre Auger observatory. PHYSICAL REVIEW LETTERS, 109(6), 062002 [10.1103/PhysRevLett.109.062002].