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Universal lateral distribution of energy deposit in air showers and its application to shower reconstruction

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arxiv astro-ph/0505371 v1 pith:CDAWJFEH submitted 2005-05-18 astro-ph

classification astro-ph
keywords showerenergylightcorrectiondistributiondepositimagelateral
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The light intensity distribution in a shower image and its implications to the primary energy reconstructed by the fluorescence technique are studied. Based on detailed CORSIKA energy deposit simulations, a universal analytical formula is derived for the lateral distribution of light in the shower image and a correction factor is obtained to account for the fraction of shower light falling into outlying pixels in the detector. The expected light profiles and the corresponding correction of the primary shower energy are illustrated for several typical event geometries. This correction of the shower energy can exceed 10%, depending on shower geometry.

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