{"title":"Measurement of CKM element |Vcb| from W boson decays at the future Higgs factories","authors":"Hao Liang, LingFeng Li, Yongfeng Zhu, Xiaoyan Shen, Manqi Ruan","doi":"10.1007/JHEP12(2024)071","DOIUrl":null,"url":null,"abstract":"<p>This study investigates the precision measurement of the CKM matrix element |<i>V</i><sub><i>cb</i></sub>| through semileptonic <i>WW</i> events at future Higgs factories, i.e., FCC-ee, ILC, C<sup>3</sup>, and CEPC. We use full detector simulation to generate the <i>WW</i> → <i>ℓνcb</i> signal events and various backgrounds at <span>\\( \\sqrt{s} \\)</span> = 240 GeV with unpolarized beams. The relative statistical uncertainties of |<i>V</i><sub><i>cb</i></sub>| 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<sup>−1</sup>. 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 <i>WW</i> threshold runs, the relative systematic uncertainty can be further reduced.</p>","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2024 12","pages":""},"PeriodicalIF":5.4000,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP12(2024)071.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of High Energy Physics","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/JHEP12(2024)071","RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Physics and Astronomy","Score":null,"Total":0}
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Abstract
This study investigates the precision measurement of the CKM matrix element |Vcb| 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 \( \sqrt{s} \) = 240 GeV with unpolarized beams. The relative statistical uncertainties of |Vcb| 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.
期刊介绍：
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