Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory

Aab, Alexander

doi:10.1103/PhysRevD.93.072006

Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory

Journal Article · Thu Apr 07 00:00:00 EDT 2016 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.93.072006· OSTI ID:1247529

Aab, Alexander ^[1]

Univ. Siegen (Germany). et al.

The azimuthal asymmetry in the risetime of signals in Auger surface detector stations is a source of information on shower development. The azimuthal asymmetry is due to a combination of the longitudinal evolution of the shower and geometrical effects related to the angles of incidence of the particles into the detectors. The magnitude of the effect depends upon the zenith angle and state of development of the shower and thus provides a novel observable, (secθ)_max, sensitive to the mass composition of cosmic rays above 3 x 10¹⁸ eV. By comparing measurements with predictions from shower simulations, we find for both of our adopted models of hadronic physics (QGSJETII-04 and EPOS-LHC) an indication that the mean cosmic-ray mass increases slowly with energy, as has been inferred from other studies. However, the mass estimates are dependent on the shower model and on the range of distance from the shower core selected. Furthermore, the method has uncovered further deficiencies in our understanding of shower modelling that must be resolved before the mass composition can be inferred from (secθ)_max.

View Accepted Manuscript (DOE)

Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Contributing Organization:: Pierre Auger Collaboration

Grant/Contract Number:: AC02-07CH11359; FG02-99ER41107; SC0011689

OSTI ID:: 1247529

Alternate ID(s):: OSTI ID: 1246180

Report Number(s):: FERMILAB-PUB--16-094-AD-AE-CD-TD; arXiv:1604.00978; 1441175

Journal Information:: Physical Review D, Journal Name: Physical Review D Journal Issue: 7 Vol. 93; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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The Giant Radio Array for Neutrino Detection (GRAND): Science and design Álvarez-Muñiz, Jaime; Alves Batista, Rafael; Balagopal V., Aswathi Science China Physics, Mechanics & Astronomy, Vol. 63, Issue 1 https://doi.org/10.1007/s11433-018-9385-7	journal	August 2019
The Giant Radio Array for Neutrino Detection (GRAND): Science and Design Collaboration, Grand; Alvarez-Muniz, Jaime; Batista, Rafael Alves arXiv https://doi.org/10.48550/arxiv.1810.09994	text	January 2018

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