Author:
Liang Hao,Zhu Yongfeng,Lai Pei-Zhu,Ruan Manqi
Abstract
Abstract
We investigate the tracker configuration optimization for the Circular Electron Position
Collider (CEPC), a proposed Higgs and Z factory. Fixing the construction cost comparable to that
of the baseline detector design and considering the benchmark channels (Z ⟶ ff̅,
WW fusion with H ⟶ ff̅, ZH ⟶ ννff̅, and
tt̅ ⟶ bb̅μνμud) of various operating modes of the CEPC, we obtain the
optimal tracker radius that provides the best average resolution of the track momentum or jet
energy. The optimal tracker radii for track momentum resolution range from 1.59 m to 1.73 m and
for jet energy resolution from 1.82 m to 1.97 m, depending on the benchmark channels. Compared
to the jets, the tracks prefer a smaller radius and a longer length because the track momentum
resolution degrades more significantly than jet energy resolution in the forward region. The
benchmark channel for Z-pole prefers a smaller radius and longer length compared to other
benchmark channels because the final state particles at the Z-pole have a more forward
distribution. We also analyze the scaling behavior of the optimal tracker configuration at
floating construction cost and observe a weak dependence.
Subject
Mathematical Physics,Instrumentation
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