The Higgs→ $$ B\overline{b} $$, $$ C\overline{c} $$, Gg Measurement at CEPC
The Journal of high energy physics/The journal of high energy physics(2022)
摘要
Abstract Accurately measuring the properties of the Higgs boson is one of the core physics objectives of the Circular Electron Positron Collider (CEPC). As a Higgs factory, the CEPC is expected to operate at a centre-of-mass energy of 240 GeV, deliver an integrated luminosity of 5.6 ab−1, and produce one million Higgs bosons according to the CEPC Conceptual Design Report (CDR). Combining measurements of the ℓ+ℓ−H, $$ \nu \overline{\nu}H $$ ν ν ¯ H , and $$ q\overline{q}H $$ q q ¯ H channels, we conclude that the signal strength of $$ H\to b\overline{b}/c\overline{c}/ gg $$ H → b b ¯ / c c ¯ / gg can be measured with a relative accuracy (relative statistical uncertainty only) of 0.27%/4.03%/1.56%. Extrapolating to the recently released TDR operating parameters corresponding to the integrated luminosity of 20 ab−1, the relative accuracy of $$ H\to b\overline{b}/c\overline{c}/ gg $$ H → b b ¯ / c c ¯ / gg signal strength is 0.14%/2.13%/0.82% (relative statistical uncertainty only). We analyze the dependence of the expected accuracies on the critical detector performances: Color Singlet Identification (CSI) for the $$ q\overline{q}H $$ q q ¯ H channel and flavor tagging for both $$ \nu \overline{\nu}H $$ ν ν ¯ H and $$ q\overline{q}H $$ q q ¯ H channels. Compared to the baseline CEPC detector performance, ideal flavor tagging can increase the $$ H\to b\overline{b}/c\overline{c}/ gg $$ H → b b ¯ / c c ¯ / gg signal strength accuracy by 2%/63%/13% in the $$ \nu \overline{\nu}H $$ ν ν ¯ H channel and 35%/122%/181% in the $$ q\overline{q}H $$ q q ¯ H channel. A strong dependence between the CSI performance and anticipated accuracies in $$ q\overline{q}H $$ q q ¯ H channel is identified. The relevant systematic uncertainties are also discussed in this paper.
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关键词
e+-e- Experiments,Higgs Physics,Jets
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