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تسجيل مستخدم جديدMeasurement of the Proton-Air Cross Section with Telescope Arrays Middle Drum Detector and Surface Array in Hybrid Mode
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In this work we are reporting on the measurement of the proton-air inelastic cross section $sigma^{rm inel}_{rm p-air}$ using the Telescope Array (TA) detector. Based on the measurement of the $sigma^{rm inel}_{rm p-air}$ the proton-proton cross section $sigma_{rm p-p}$ value is also determined at $sqrt{s} = 95_{-8}^{+5}$ TeV. Detecting cosmic ray events at ultra high energies with 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 is the hybrid events observed by the Middle Drum fluorescence detector together with the surface array detector collected over five years. The value of the $sigma^{rm inel}_{rm p-air}$ is found to be equal to $567.0 pm 70.5 [{rm Stat.}] ^{+29}_{-25} [{rm Sys.}]$ mb. The total proton-proton cross section is subsequently inferred from Glauber Formalism and Block, Halzen and Stanev QCD inspired fit and is found to be equal to $170_{-44}^{+48} [{rm Stat.}] _{-17}^{+19} [{rm Sys.}] $mb.
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Previous measurements of the composition of Ultra-High Energy Cosmic Rays(UHECRs) made by the High Resolution Flys Eye(HiRes) and Pierre Auger Observatory(PAO) are seemingly contradictory, but utilize different detection methods, as HiRes was a stere
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rvatories have large enough exposures to collect significant statistics for a reliable measurement for energies above what can be attained in the lab. Cosmic ray measurements of cross section use atmospheric calorimetry to measure depth of air shower maximum ($X_{mathrm{max}}$), which is related to the primary particles energy and mass. The tail of the $X_{mathrm{max}}$ 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, $sigma^{mathrm{inel}}_{mathrm{p-air}}$, using data observed by Telescope Arrays Black Rock Mesa and Long Ridge fluorescence detectors and surface detector array in hybrid mode is presented. $sigma^{mathrm{inel}}_{mathrm{p-air}}$ is observed to be $520.1 pm 35.8$[Stat.] $^{+25.0}_{-40}$[Sys.]~mb at $sqrt{s} = 73$ TeV. The total proton-proton cross section is subsequently inferred from Glauber formalism and is found to be $sigma^{mathrm{tot}}_{mathrm{pp}} = 139.4 ^{+23.4}_{-21.3}$ [Stat.]$ ^{+15.0}_{-24.0}$[Sys.]~mb.
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