EPJ Web Conf.
Volume 283, 2023Ultra High Energy Cosmic Rays (UHECR 2022)
|Number of page(s)||4|
|Section||Energy Spectrum and Mass Composition|
|Published online||28 April 2023|
Testing the Compatibility of the Depth of the Shower Maximum Measurements performed at Telescope Array and the Pierre Auger Observatory
Auger-TA Mass Composition Working Group Report
1 University of Utah, High Energy Astrophysics Institute, Salt Lake City, UT, USA
2 University of Adelaide, Adelaide, S.A., Australia
3 Universidade de São Paulo, Instituto de Física de São Carlos, São Carlos, SP, Brazil
4 Karlsruhe Institute of Technology, Institute for Astroparticle Physics, Karlsruhe, Germany
5 Colorado School of Mines, Golden, CO, USA
6 Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic
7 Telescope Array Project, 201 James Fletcher Bldg, 115 S 1400 East, Salt Lake City, UT 84112-0830, USA Full author list: http://www.telescopearray.org/research/collaborators
8 Observatorio Pierre Auger, Av. San Martín Norte 304, 5613, Malargüe, Argentina. Full author list: http://www.auger.org/archive/authors_2022_10.html
* Corresponding author: firstname.lastname@example.org
** Corresponding author: email@example.com
Published online: 28 April 2023
The Telescope Array and the Pierre Auger Observatory estimate the composition of ultra-high-energy cosmic rays by observing the distribution of depths of air-shower maxima, X max. Both experiments directly observe the longitudinal development of air showers using fluorescence telescopes with surface particle detectors used in conjunction to provide precision in determining air-shower geometry. The two experiments differ in the details of the analysis of events, so a direct comparison of X max distributions is not possible. The Auger – Telescope Array Composition Working Group presents their results from a technique to compare X max measurements from Auger with those of Telescope Array. In particular, the compatibility of the first two moments of the X max distributions of Auger with the data from the Black Rock Mesa and Long Ridge detectors of the Telescope Array is tested for energies above 1018.2 eV. Quantitative comparisons are obtained using air-shower simulations of four representative species made using the Sibyll 2.3d high-energy interaction model. These are weighted to fit the fractional composition seen in Auger data and reconstructed using the Telescope Array detector response and analysis methods.
© The Authors, published by EDP Sciences, 2023
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