| Autor: |
Yongfeng Zhu, Hanhua Cui, Manqi Ruan |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Journal of High Energy Physics, Vol 2022, Iss 11, Pp 1-29 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
1029-8479 |
| DOI: |
10.1007/JHEP11(2022)100 |
| Popis: |
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, ν ν ¯ H $$ \nu \overline{\nu}H $$ , and q q ¯ H $$ q\overline{q}H $$ channels, we conclude that the signal strength of H → b b ¯ / c c ¯ / gg $$ H\to b\overline{b}/c\overline{c}/ gg $$ 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 → b b ¯ / c c ¯ / gg $$ H\to b\overline{b}/c\overline{c}/ gg $$ 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 q ¯ H $$ q\overline{q}H $$ channel and flavor tagging for both ν ν ¯ H $$ \nu \overline{\nu}H $$ and q q ¯ H $$ q\overline{q}H $$ channels. Compared to the baseline CEPC detector performance, ideal flavor tagging can increase the H → b b ¯ / c c ¯ / gg $$ H\to b\overline{b}/c\overline{c}/ gg $$ signal strength accuracy by 2%/63%/13% in the ν ν ¯ H $$ \nu \overline{\nu}H $$ channel and 35%/122%/181% in the q q ¯ H $$ q\overline{q}H $$ channel. A strong dependence between the CSI performance and anticipated accuracies in q q ¯ H $$ q\overline{q}H $$ channel is identified. The relevant systematic uncertainties are also discussed in this paper. |
| Databáze: |
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| Externí odkaz: |
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