Study on the separation of 100 TeV γ-rays from cosmic rays for the Tibet ASγ experiment

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FENG Zhao-Yang, ZHANG Yi, LIU Cheng, FAN Chao, LI Hong-Chao, WANG Bo, WU Han-Rong, HU Hong-Bo, LU Hong and TAN You-Heng. Study on the separation of 100 TeV γ-rays from cosmic rays for the Tibet ASγ experiment[J]. Chinese Physics C, 2011, 35(2): 153-157. doi: 10.1088/1674-1137/35/2/009
FENG Zhao-Yang, ZHANG Yi, LIU Cheng, FAN Chao, LI Hong-Chao, WANG Bo, WU Han-Rong, HU Hong-Bo, LU Hong and TAN You-Heng. Study on the separation of 100 TeV γ-rays from cosmic rays for the Tibet ASγ experiment[J]. Chinese Physics C, 2011, 35(2): 153-157.  doi: 10.1088/1674-1137/35/2/009 shu
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Received: 2010-03-01
Revised: 2010-07-13
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Study on the separation of 100 TeV γ-rays from cosmic rays for the Tibet ASγ experiment

Abstract: A γ/hadron separation analysis is described for the observed air shower events with primary energy above 100 TeV based on the Tibet ASγ detector configuration. The shower age and size parameters are fitted from the measured lateral density distribution and used as discrimination variables. According to the MC simulation while taking into account the systematic uncertainty estimated from data and MC comparison, it is found that 70% of the cosmic ray (CR) background can be rejected while more than 78% of the γ-rays can be retained. Sensitivity for 100 TeV γ-rays observation can thus be improved by at least 40%.

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