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Abstract: With hybrid data of the Pierre Auger Observatory it is possible to measure the cross section of proton-air collisions at energies far beyond the reach of the LHC. Since the first measurement by the Pierre Auger Collaboration the event statistics has increased significantly. The proton-air cross section is now estimated in the two energy intervals in lg(E/eV) from 17.8 to 18 and from 18 to 18.5. These energies are chosen so that they maximise the available event statistics and at the same time lie in the region most compatible with a significant primary proton fraction. Of these data, only the 20% of most proton-like events are considered for the measurement. Furthermore, with a new generation of hadronic interaction models which have been tuned to LHC data, the model-dependent uncertainties of the measurement are re-visited.
Found in: ključnih besedah
Keywords: Pierre Auger Observatory, extensive air showers, proton-air cross section, hadronic interaction models
Published: 03.03.2016; Views: 3630; Downloads: 186
Fulltext (114,02 KB)

Found in: ključnih besedah
Summary of found: ...Pierre Auger Observatory, extensive air showers, hadronic interactions, proton-air inelastic cross-section...
Keywords: Pierre Auger Observatory, extensive air showers, hadronic interactions, proton-air inelastic cross-section
Published: 27.06.2017; Views: 3215; Downloads: 0
Fulltext (4,90 MB)

Abstract: Ultra high energy cosmic rays provide the highest known energy source in the universe to measure proton cross sections. Though conditions for collecting such data are less controlled than an accelerator environment, current generation cosmic ray observatories have large enough exposures to collect significant statistics for a reliable measurement for energies above what can be attained in the lab. Cosmic ray measurements of cross section use atmospheric calorimetry to measure depth of air shower maximum (Xmax), which is related to the primary particle’s energy and mass. The tail of the Xmax distribution is assumed to be dominated by showers generated by protons, allowing measurement of the inelastic proton-air cross section. In this work the proton-air inelastic cross section measurement, σ_inel_p−air, using data observed by Telescope Array’s Black Rock Mesa and Long Ridge fluorescence detectors and surface detector array in hybrid mode is presented. σ_inel_p−air is observed to be 520.1 ± 35.8 [Stat.] +25.0 −40 [Sys.] mb at √s = 73 TeV. The total proton-proton cross section is subsequently inferred from Glauber formalism and is found to be σ_tot_pp = 139.4 +23.4−21.3[Stat.] +15.0−24.0[Sys.] mb.
Found in: ključnih besedah
Keywords: cosmic rays, astroparticles, proton-air cross section
Published: 04.02.2021; Views: 1560; Downloads: 0
Fulltext (1,99 MB)