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Measurement of the proton-air cross section with Telescope Array's Middle Drum detector and surface array in hybrid mode

par Aguilar Sanchez, Juan Antonio ;Tiniakov, Petr ;Urban, Federico ; [et al.]
Référence Physical review. D, Particles, fields, gravitation, and cosmology, 92, 3, 032007
Publication Publié, 2015-08

Article révisé par les pairs

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Résumé :

In this work we are reporting on the measurement of the proton-air inelastic cross section σp-airinel using the Telescope Array detector. Based on the measurement of the σp-airinel, the proton-proton cross section σp-p value is also determined at s=95-8+5TeV. Detecting cosmic ray events at ultrahigh energies with the Telescope Array enables us to study this fundamental parameter that we are otherwise unable to access with particle accelerators. The data used in this report are the hybrid events observed by the Middle Drum fluorescence detector together with the surface array detector collected over five years. The value of the σp-airinel is found to be equal to 567.0±70.5[Stat]-25+29[Sys]mb. The total proton-proton cross section is subsequently inferred from Glauber formalism and the Block, Halzen and Stanev QCD inspired fit and is found to be equal to 170-44+48[Stat]-17+19[Sys]mb.