Separation of γ/π^0 showers at high energies

Details Separation of γ/π^0 showers at high energies Separation of γ/π^0 showers at high energies

1996-10-08

arxiv.org/abs/hep-ex/9610005v3

Nucl.Instrum.Meth. A391 (1997) 351-359

Physics

High Energy Physics

High Energy Physics - Experiment

16 pages, 6 figures, LaTeX. Submitted to Nuclear Instruments and Methods

Scientific paper

10.1016/S0168-9002(97)00520-2

We have designed and carried out simulation studies of a two layer Shower Maximum Detector diagonally off-set (SMD-dos) optimized for the separation of \pi^0 showers from \gamma showers in the 30 to 150 GeV energy range. For 90% \gamma acceptance the SMD-dos yields \pi^0 rejection efficiency of 92+-4%, 87+-4% and 32+-2%, respectively, for 30, 50 and 150 GeV incident energies. We find that the SMD-dos is superior to a conventional geometry single-layer or mutiple-layer shower maximum detector (SMD), of equal granularity, by an average factor of ~1.5 over the 50 to 150 GeV energy range. We also find that the SMD-dos gives better \pi^0 rejection, for the same number of channels, than a SMD. At hadron - hadron colliders the signature of choice for the detection of the Higgs particle, in the mass range of 120 to 160 GeV, is via the decay H-->\gamma\gamma. The addition of a SMD-dos to the planned detectors at the LHC would significantly reduce the background to the \gamma-signal coming from prolific \pi^0 production.

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