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Title:Study of muons from ultrahigh energy cosmic ray air showers measured with the Telescope Array experiment
Authors:ID Abbasi, R.U. (Author)
ID Lundquist, Jon Paul, UNG (Author), et al.
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Language:English
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:One of the uncertainties in the interpretation of ultrahigh energy cosmic ray data comes from the hadronic interaction models used for air shower Monte Carlo (MC) simulations. The number of muons observed at the ground from ultrahigh energy cosmic ray–induced air showers is expected to depend upon the hadronic interaction model. One may therefore test the hadronic interaction models by comparing the measured number of muons with the MC prediction. In this paper, we present the results of studies of muon densities in ultrahigh energy extensive air showers obtained by analyzing the signal of surface detector stations which should have high muon purity. The muon purity of a station will depend on both the inclination of the shower and the relative position of the station. In seven years’ data from the Telescope Array experiment, we find that the number of particles observed for signals with an expected muon purity of ∼65% at a lateral distance of 2000 m from the shower core is 1.72± 0.10(stat)±0.37(syst) times larger than the MC prediction value using the QGSJET II-03 model for proton-induced showers. A similar effect is also seen in comparisons with other hadronic models such as QGSJET II-04, which shows a 1.67±0.10±0.36 excess. We also studied the dependence of these excesses on lateral distances and found a slower decrease of the lateral distribution of muons in the data as compared to the MC, causing larger discrepancy at larger lateral distances.
Keywords:UHECR, cosmic rays, muons, particle physics
Publication version:Version of Record
Year of publishing:2018
Number of pages:10
Numbering:2, 98
PID:20.500.12556/RUNG-5191-a60943c6-ec7d-4ec8-9a5a-9e1da5c8373f New window
COBISS.SI-ID:13254659 New window
DOI:10.1103/PhysRevD.98.022002 New window
NUK URN:URN:SI:UNG:REP:DVINLTFT
Publication date in RUNG:30.04.2020
Views:3651
Downloads:0
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ABBASI, R.U. and LUNDQUIST, Jon Paul, 2018, Study of muons from ultrahigh energy cosmic ray air showers measured with the Telescope Array experiment. Physical Review D [online]. 2018. Vol. 2, no. 98. [Accessed 7 April 2025]. DOI 10.1103/PhysRevD.98.022002. Retrieved from: https://repozitorij.ung.si/IzpisGradiva.php?lang=eng&id=5191
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Title:Physical Review D
Year of publishing:2018

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License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:29.04.2020

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