Measurement of CKM element |V cb | from W boson decays at the future Higgs factories
Abstract This study investigates the precision measurement of the CKM matrix element |V cb | through semileptonic WW events at future Higgs factories, i.e., FCC-ee, ILC, C3, and CEPC. We use full detector simulation to generate the WW → ℓνcb signal events and various backgrounds at s $$ \sqrt{s} $$...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2024-12-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP12(2024)071 |
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| Summary: | Abstract This study investigates the precision measurement of the CKM matrix element |V cb | through semileptonic WW events at future Higgs factories, i.e., FCC-ee, ILC, C3, and CEPC. We use full detector simulation to generate the WW → ℓνcb signal events and various backgrounds at s $$ \sqrt{s} $$ = 240 GeV with unpolarized beams. The relative statistical uncertainties of |V cb | are projected to be 0.91% for the muon channel and 1.2% for the electron channel, assuming a baseline integrated luminosity of 5 ab−1. The sensitivities at other Higgs factory scenarios are also projected. Possible contributors to systematic uncertainties are discussed, with the most prominent one being the systematics of flavor-tagging and mistagging rates. Combining with WW threshold runs, the relative systematic uncertainty can be further reduced. |
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| ISSN: | 1029-8479 |