Discrimination of converted photons and neutral pions at high energies

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XIAO Hong, CHEN Guo-Ming, TAO Jun-Quan, BIAN Jian-Guo, FAN Jia-Wei, LIANG Song, MENG Xiang-Wei, SHEN Yu-Qiao, TANG Zhi-Cheng, WANG Jian, WANG Xian-You, WANG Zheng, XU Ming, XU Wei-Wei, YANG Min and YAN Qi. Discrimination of converted photons and neutral pions at high energies[J]. Chinese Physics C, 2012, 36(10): 979-984. doi: 10.1088/1674-1137/36/10/011
XIAO Hong, CHEN Guo-Ming, TAO Jun-Quan, BIAN Jian-Guo, FAN Jia-Wei, LIANG Song, MENG Xiang-Wei, SHEN Yu-Qiao, TANG Zhi-Cheng, WANG Jian, WANG Xian-You, WANG Zheng, XU Ming, XU Wei-Wei, YANG Min and YAN Qi. Discrimination of converted photons and neutral pions at high energies[J]. Chinese Physics C, 2012, 36(10): 979-984.  doi: 10.1088/1674-1137/36/10/011 shu
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Received: 2012-01-18
Revised: 2012-03-15
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Discrimination of converted photons and neutral pions at high energies

    Corresponding author: XIAO Hong,

Abstract: In the LHC experiment, the H→γγ channel provides a clean nal state with an effective mass peak that is reconstructed with great precision, despite the small branching ratio. As a consequence, the H→γγ channel is one of the most promising channels for the Higgs discovery in the very low mass region. In order to increase the sensitivity of the Higgs search, background rejection rate is very important, so γ/π0 discrimination is one of the key points in the analysis. At least 40% of photons will convert with the experience of ATLAS and CMS. We constructed electromagnetic calorimeter (ECAL) in GEANT4 simulation, using 6 variables which have different shapes between converted γ and π0, with the TMVA (Toolkit for Multivariate Data Analysis) to do the separation. With this method we can get 30% to 60% π0 rejection efficiency when keeping 90% converted γ efficiency, in the region of transverse momentum 15 GeV to 75 GeV, not only in MC sumulation but also in real data.

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