Measurement of the Proton-Air Cross Section at √s=57  TeV with the Pierre Auger Observatory

AUGER COLLABORATION (VER F. SANCHEZ EN PUBL. ADJUNTA)

PHYSICAL REVIEW LETTERS

AMER PHYSICAL SOC

Lugar: New York; Año: 2012 vol. 109 p. 1 - 9

0031-9007

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.