scholarly journals Photon decay in ultrahigh-energy air showers: Stringent bound on Lorentz violation

2021 ◽  
Vol 104 (1) ◽  
Author(s):  
Fabian Duenkel ◽  
Marcus Niechciol ◽  
Markus Risse
Keyword(s):  
Lorentz Violation ◽  
Ultrahigh Energy ◽  
Air Showers ◽  
Photon Decay

scholarly journals Photon decay in UHE air showers: a stringent bound on Lorentz violation

2021 ◽  
Author(s):  
Fabian Duenkel ◽  
Marcus Niechciol ◽  
Markus Risse
Keyword(s):  
Lorentz Violation ◽  
Air Showers ◽  
Photon Decay

scholarly journals Investigating the influence of diffractive interactions on ultrahigh-energy extensive air showers

2018 ◽  
Vol 33 (26) ◽  
pp. 1850153 ◽  
Author(s):  
L. B. Arbeletche ◽  
V. P. Gonçalves ◽  
M. A. Müller
Keyword(s):  
Phenomenological Models ◽  
Cosmic Ray ◽  
Extensive Air Showers ◽  
Ultrahigh Energy ◽  
Air Showers ◽  
Hadronic Interactions ◽  
Air Shower ◽  
Cosmic Ray Interactions ◽  
The Impact ◽  
Elasticity Number

The understanding of the basic properties of the ultrahigh-energy extensive air showers is dependent on the description of hadronic interactions in an energy range beyond that probed by the LHC. One of the uncertainties present in the modeling of air showers is the treatment of diffractive interactions, which are dominated by nonperturbative physics and usually described by phenomenological models. These interactions are expected to affect the development of the air showers, since they provide a way of transporting substantial amounts of energy deep in the atmosphere, modifying the global characteristics of the shower profile. In this paper, we investigate the impact of diffractive interactions in the observables that can be measured in hadronic collisions at high energies and ultrahigh-energy cosmic ray interactions. We consider three distinct phenomenological models for the treatment of diffractive physics and estimate the influence of these interactions on the elasticity, number of secondaries, longitudinal air shower profiles and muon densities for proton-air and iron-air collisions at different primary energies. Our results demonstrate that even for the most recent models, diffractive events have a non-negligible effect on the observables and that the distinct approaches for these interactions, present in the phenomenological models, still are an important source of theoretical uncertainty for the description of the extensive air showers.

scholarly journals Study of muons from ultrahigh energy cosmic ray air showers measured with the Telescope Array experiment

2019 ◽  
Vol 210 ◽  
pp. 02012
Author(s):  
R. Takeishi
Keyword(s):  
Interaction Model ◽  
Cosmic Ray ◽  
Mass Composition ◽  
Ultrahigh Energy ◽  
Air Showers ◽  
Hadronic Interaction ◽  
Telescope Array ◽  
Interaction Models ◽  
Air Shower ◽  
Number Of Particles

One of the uncertainties in ultrahigh energy cosmic ray (UHECR) observation derives from the hadronic interaction model used for air shower Monte-Carlo (MC) simulations. One may test the hadronic interaction models by comparing the measured number of muons observed at the ground from UHECR induced air showers with the MC prediction. The Telescope Array (TA) is the largest experiment in the northern hemisphere observing UHECR in Utah, USA. It aims to reveal the origin of UHECRs by studying the energy spectrum, mass composition and anisotropy of cosmic rays by utilizing an array of surface detectors (SDs) and fluorescence detectors. We studied muon densities in the UHE extensive air showers by analyzing the signal of TA SD stations for highly inclined showers. On condition that the muons contribute about 65% of the total signal, the number of particles from air showers is typically 1.88 ± 0.08 (stat.) ± 0.42 (syst.) times larger than the MC prediction with the QGSJET II-03 model for proton-induced showers. The same feature was also obtained for other hadronic interaction models, such as QGSJET II-04.

scholarly journals Atmospheric Monitoring at a Cosmic Ray Observatory - a long-lasting endeavour

2019 ◽  
Vol 197 ◽  
pp. 02001
Author(s):  
Bianca Keilhauer
Keyword(s):  
Cosmic Rays ◽  
Cosmic Ray ◽  
Extensive Air Showers ◽  
Pierre Auger Observatory ◽  
Ultrahigh Energy ◽  
Atmospheric Conditions ◽  
Air Showers ◽  
Atmospheric Monitoring ◽  
Surface Detector ◽  
Planning And Construction

The Pierre Auger Observatory for detecting ultrahigh energy cosmic rays has been founded in 1999. After a main planning and construction phase of about five years, the regular data taking started in 2004, but it took another four years until the full surface detector array was deployed. In parallel to the main detectors of the Observatory, a comprehensive set of instruments for monitoring the atmospheric conditions above the array was developed and installed as varying atmospheric conditions influence the development and detection of extensive air showers. The multitude of atmospheric monitoring installations at the Pierre Auger Observatory will be presented as well as the challenges and efforts to run such instruments for several decades.

scholarly journals Lorentz violation and ultrahigh-energy photons

2008 ◽  
Vol 78 (6) ◽  
Author(s):  
Matteo Galaverni ◽  
Günter Sigl
Keyword(s):  
Lorentz Violation ◽  
Ultrahigh Energy

scholarly journals LORENTZ VIOLATION DISPERSION RELATION AND ITS APPLICATION

2009 ◽  
Vol 24 (07) ◽  
pp. 1359-1381 ◽  
Author(s):  
ZHI XIAO ◽  
BO-QIANG MA
Keyword(s):  
Dispersion Relation ◽  
Quantum Electrodynamics ◽  
Lorentz Violation ◽  
Cosmic Ray ◽  
Ultrahigh Energy ◽  
Standard Model Extension ◽  
Modified Dispersion Relation ◽  
Model Extension ◽  
The Standard Model ◽  
Spinor Formalism

We derive a modified dispersion relation (MDR) in the Lorentz violation extension of the quantum electrodynamics (QED) sector in the standard model extension (SME) framework. Based on the extended Dirac equation and corresponding MDR, we observe the resemblance of the Lorentz violation coupling to spin–gravity coupling. We also develop a neutrino oscillation mechanism induced by the presence of nondiagonal terms of Lorentz violation couplings in two-flavor space in a two-spinor formalism by explicitly assuming neutrinos to be Marjorana fermions. We also obtain a very stringent bound (∽ 10-25) on one of the Lorentz violation parameters by applying the MDR to the ultrahigh energy cosmic ray (UHECR) problem.

Classification of ultrahigh-energy extensive air showers in terms of the muon content

JETP Letters ◽  
2006 ◽  
Vol 83 (7) ◽  
pp. 265-267 ◽  
Author(s):  
A. A. Mikhaĭlov ◽  
N. N. Efremov ◽  
E. S. Nikiforova
Keyword(s):  
Extensive Air Showers ◽  
Ultrahigh Energy ◽  
Air Showers

Extensive ultrahigh energy air showers and pulsars

2011 ◽  
Vol 75 (3) ◽  
pp. 294-295
Author(s):  
V. A. Kolosov ◽  
A. A. Mikhailov
Keyword(s):  
Ultrahigh Energy ◽  
Air Showers
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