Kavli Affiliate: Feng Wang
| First 5 Authors: Fangyi Guo, Yaquan Fang, Gang Li, Xinchou Lou, Feng Wang
| Summary:
This note presents the prospects of measuring $Br(Hto gammagamma)$ of the
Standard Model Higgs boson at the future Circular Electron-Positron Collider
(CEPC) baseline detector (CEPC-v4) in $e^{+}e^{-}$ collisions at $sqrt{s}$ =
240 GeV in $e^{+}e^{-} to ZH$, $H to gammagamma$, $Z to qbar{q} / mu^{+}
mu^{-} / nubar{nu}$ processes. The Monte Carlo simulated events are
generated and scaled to an integrated luminosity of 5.6 $ab^{-1}$ to mimic the
data. The expected statistical precision of this measurement after combining 3
channels is 6.81%, without any systematic uncertainties considered. The
performance of CEPC electro-magnetic calorimeter (ECAL) is studied by smearing
the photon energy resolution in simulated events in $e^{+}e^{-} to ZH to
qbar{q}gammagamma$ channel. In present ECAL design the stochastic term in
resolution plays the dominant role in Higgs measurements. Relationships between
the resolution and $delta Br(ZH to qbar{q}gammagamma)$ as well as the
balanced points of ECAL constant term and stochastic term are presented for the
detector optimization.
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