PT Journal
AU Pierre Auger Collaboration (Abreu, Pea
   Pastor, S
TI Measurement of the Proton-Air Cross Section at root s=57 TeV with the Pierre Auger Observatory
SO Physical Review Letters
JI Phys. Rev. Lett.
PY 2012
BP 062002
EP 9pp
VL 109
IS 6
DI 10.1103/PhysRevLett.109.062002
LA English
AB 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.
ER