Analysis of Ultra High Energetic Cosmic Rays measured in monocular mode with the fmuorescence telescopes at the Pierre Auger Observatory Yes, FDMono it is 1 / 10
Motivation ● FD Mono Event from April ● Outside of SD array ● Almost 100 EeV ● Well reconstructed Search for FDMono, Thomas Moch 2 / 10
Motivation ● Mono: Events without SD and in only one eye ● Simulation of effective area already done in 2004 by Sergio Petrara ● Extrapolation to UHECR → potentially lots of statistics not yet used, but ... How reliable is the reconstruction without the additional data from SD or a second eye? Search for FDMono, Thomas Moch 3 / 10
Quality of Mono reconstruction ● Sample of Hybrid events used to define quality cuts for Mono ● Hybrid reconstruction seen as “true”, deviations from it as problems of the Mono reconstruction ● Roughly binned spectrum → already visible migration effect into emptier bins Search for FDMono, Thomas Moch 4 / 10
Quality of Mono reconstruction FDMono uses two step reconstruction: ● SDP fit works well most of the time, but not always →constraints on χ 2 of SDP ● Four-Parameter time fit → often underdetermined due to t = t 0 +( R p c )∗ tan ( χ 0 − χ missing additional info by SD ) 2 Also no second FD eye for geometric core location → core Position on SDP often reconstructed incorrectly and with wrong energy, leads to subsequent errors in other variables → cut on the χ 2 of time fit Search for FDMono, Thomas Moch 5 / 10
Cuts ● Exclusion of HEAT because of outliers ● Unrealistic xMax values excluded by energy dependent cuts ● χ 2 SDP /NDF < 4 ● Cut on difference of fitted χ 2 and χ 2 of a potential linear fit → strongest selection criteria ● Efficiency of total cuts at high energies ~ 60% Search for FDMono, Thomas Moch 6 / 10
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