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Dominant Contributions to Lateral Distribution Functions in Ultra-High Energy Cosmic Ray Air Showers | | Hans-Joachim Drescher
; Glennys R. Farrar
; | | Date: |
12 Jun 2002 | | Journal: | Astropart.Phys. 19 (2003) 235-244 | | Subject: | hep-ph | | Abstract: | In hadron induced air showers of highest energies (E> 1e18 eV), the lateral distribution functions of electrons and muons are a superposition of many separate electromagnetic sub-showers, initiated by meson decay at different altitudes and energies. The lateral distribution function is the primary tool for reconstructing the energy of the primary in a UHE cosmic ray shower, so understanding it in detail is a prerequisite for having confidence in the energy determination. We analyze in this paper the dominant contributions to the ground level lateral distribution functions, as a function of the altitude and energy at which the sub-showers are initiated. Far from the core, the dominant contribution to the density of electrons comes from sub-showers initiated at low altitudes and low energies (E<100 GeV). The dominant sub-showers are initiated at large radial distance from the core and at a large angle with respect to the main shower axis. This demonstrates the need for careful treatment of low energy hadron physics modeling even for ultrahigh energy primaries. | | Source: | arXiv, hep-ph/0206112 | | Services: | Forum | Review | PDF | Favorites | |
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